Dissertations / Theses on the topic 'Vegetation changes'
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Abraitienė, Jolita. "Climate-induced changes of vegetation in broadleaved deciduous forests." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20121024_111936-53102.
Full textDarbo tikslas – ištirti meteorologinių veiksnių įtaką plačialapių lapuočių miškų augalijos fenologiniams tarpsniams skirtingų klimatinių sąlygų metais. Tyrimo uždaviniai: 1. charakterizuoti meteorologinių rodiklių (temperatūros, kritulių) reikšmių kaitą tiriamuoju laikotarpiu; 2. nustatyti apšvietimą po medžių lajomis, medžių ir krūmų lapojimo fenologinius tarpsnius ir jų pokyčius; 3. nustatyti žolinių augalų projekcinio padengimo, aukščio, fenologinių tarpsnių kaitą vegetacijos metu; 4. nustatyti ryšį tarp meteorologinių veiksnių ir sumedėjusių, žolinių augalų fenologinių tarpsnių. Darbo mokslinis naujumas, teorinė ir praktinė reikšmė. Lietuvoje iki šiol daugiausia atlikta fenologinių tyrimų su žemės ūkio augalais. Sumedėjusių augalų ir miško žolinių augalų detalių fenologinių tyrimų Lietuvoje beveik nėra. Daugiausia atlikta indikatorinių rūšių, kaip paprastasis lazdynas, paprastasis šalpusnis ir kt., tyrimų. Pirmą kartą Lietuvoje kompleksiškai tirta miško bendrija, nustatyta meteorologinių veiksnių įtaka sumedėjusių augalų lapojimo ir žolinių augalų fenologiniams tarpsniams Kamšos botaniniame-zoologiniame draustinyje. Darbo rezultatai leidžia geriau įvertinti meteorologinių veiksnių įtaką miško žolinės augalijos, medžių ir krūmų sezoniniam vystymuisi (fenologijai). Gautos žinios svarbios ne tik teoriniam išsamesniam atskirų rūšių biologijos pažinimui, bet ir praktiniams tikslams: dendrologijoje, fitopatologijoje ir t. t.
Tanentzap, Andrew Joseph. "Global vegetation responses to deer : ecosystem changes and recovery." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609232.
Full textSturgess, Peter William. "Post-felling vegetation changes on three afforested sand-dune systems." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363340.
Full textLeppälä, M. (Mirva). "Successional changes in vegetation and carbon dynamics during boreal mire development." Doctoral thesis, Oulun yliopisto, 2011. http://urn.fi/urn:isbn:9789514294655.
Full textTiivistelmä Sukkessio on ekosysteemin lajistossa ja sen muissa ominaisuuksissa ajan kuluessa tapahtuva muutos. Suon kehitystä eli pitkäaikaista suosukkessiota vie eteenpäin turpeen paksuuskasvu, joka saa aikaan muutoksia suoekosysteemin hydrologiassa, kasvillisuudessa ja ravinnetilassa. Tästä johtuen myös suoekosysteemin erilaiset prosessit, kuten tuotanto sekä hajoamisen kautta tapahtuva hiilen vapautuminen eli hiilikaasutoiminta muuttuu suon ikääntyessä. Ekosysteemin hiilikaasutoiminnassa tapahtuvia muutoksia voidaan tutkia muun muassa mittaamalla ekosysteemin ja ilmakehän välisiä hiilidioksidi- ja metaanivirtoja. Boreaalisten luonnontilaisten soiden sukkessiota ja hiilidynamiikkaa on tutkittu runsaasti, mutta niiden välistä yhteyttä ei sen sijaan juuri tunneta. Tämän vuoksi ei tiedetä kuinka soiden hiilikaasutoiminta mahdollisesti muuttuu suon kehityksen aikana eli suosukkession edetessä. Tämän tutkimuksen päätavoitteena oli tutkia kuinka hiilidioksidin ja metaanin vaihdolla mitattu ekosysteemitoiminta muuttuu suon kehityksen aikana. Tutkimus pyrki myös selvittämään suosukkessiota kontrolloivat tekijät. Eri-ikäisten soiden hiilikaasudynamiikkaa tutkittiin mittaamalla hiilikaasuja Perämeren maankohoamisrannikolla kahdeksan kilometrin pituisella sukkessiogradientilla, joka koostuu primaarisoistumisen kautta syntyneistä soista. Soiden lyhyestä keskinäisestä etäisyydestä johtuen ne ovat olleet saman ilmastollisen kontrollin alaisena suurimman osan kehityksestään. Vaiheittainen kasvilajien muutos sukkessiogradientilla yhdessä kasvilajien erilaisen yhteyttämispotentiaalin, fenologian ja yhteyttävän lehtipinta-alan kanssa johti hiilidioksidivaihdon alhaisempaan tasoon sekä pienempään ajalliseen vaihteluun vanhemmilla sukkessiovaiheilla. Myös metaanin vaihdolla oli alhaisimmat vuosien väliset vaihtelut vanhemmilla vaiheilla. Yleisesti ottaen metaanipäästöt kasvoivat suon iän myötä, vaikkakaan tätä trendiä ei havaittu sateisena kasvukautena. Lisäksi tutkimus osoitti, että talviaikaiset hiilivirrat (CO2, CH4) seurasivat kesäaikaisen hiilidynamiikan vaihtelua. Kasvillisuuden keskeinen rooli ekosysteemin sukkessiossa havaittiin myös tässä tutkimuksessa. Kasvillisuuden ohella merkittäväksi suosukkessiota sääteleväksi tekijäksi osoittautui hydrologisten olojen vaikutus. Tasaisemmat hydrologiset olot vanhemmilla sukkessiovaiheilla johtivat vähäisempään ajalliseen vaihteluun metaani- ja hiilidioksidivirroissa. Tutkimuksen tulokset viittaavat siihen, että ekosysteemin hiilidynamiikka stabilisoituu suon kehityksen aikana lisääntyvän autogeenisen kontrollin kautta
Lisius, Grace L. "Vegetation Community Response to Hydrologic and Geomorphic Changes Following Dam Removal in a New England River." Thesis, Boston College, 2016. http://hdl.handle.net/2345/bc-ir:106917.
Full textDam removal is typically used to restore fish passage, natural flow regimes, and sediment transport in streams. However, dam removal also impacts the riparian vegetation, a change that can have wider effects throughout the ecosystem. Quantifying vegetation change requires a multi-year record to document pre-removal communities and both the immediate and delayed responses. In this study, vegetation change was assessed at the Merrimack Village Dam on the Souhegan River in Merrimack, NH, which was removed in August 2008. The removal caused a ~3 meter drop in water level and rapid erosion of impounded sediment, with ~50% removed in the first three months. The vegetation was sampled using plots at specific intervals along 7 monumented transects that were perpendicular to the channel or adjacent wetland. Tree, shrub, and herbaceous communities were assessed using species percent areal coverage techniques in July 2007, 2009, 2014 and 2015. Change over time was quantified using Analysis of Similarity (ANOSIM) on the Bray-Curtis dissimilarity matrix. As expected, vegetation communities in control plots upstream of the impoundment did not show significant change during the study period. Tree and shrub communities adjacent to the impoundment also did not show significant change. All herbaceous communities adjacent to the impoundment changed significantly (p < 0.05). The herbaceous plots closest to the channel changed to bare sand in 2009 due to erosion in the former impoundment, but by 2014 the riparian fringe community seen in 2007 had re-established and expanded in this area, but at a lower elevation. Between 2007 and 2014, the wetland herbaceous community changed from aquatic species to a stable terrestrial community that persisted without significant change in 2015. From 2007 to 2014, the vegetation community on a mid-channel island of impoundment sand changed from a community with ~50% invasive reed canary grass to a ~98% community of invasive black swallowwort, a species not recorded at the site pre-removal. The vegetation response was greatest in areas with largest geomorphic and hydrologic change, such as along the channel margin where erosion and bank slumping created an unstable scarp or on the mid-channel island and off-channel wetland strongly impacted by the lowered water table. However, large unvegetated areas never persisted nor did the areal coverage of invasive species expand: two common concerns of dam removals
Thesis (BS) — Boston College, 2016
Submitted to: Boston College. College of Arts and Sciences
Discipline: Scholar of the College
Discipline: Earth and Environmental Sciences
Gibbs, Holly K. "Quantification of Human-Induced Changes in Global Vegetation and Associated Climatic Parameters." The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406738681.
Full textBradford, Jessica. "Examining Culex tarsalis (Diptera: Culicidae) population changes with satellite vegetation index data." Kansas State University, 2014. http://hdl.handle.net/2097/17139.
Full textDepartment of Diagnostic Medicine/Pathobiology
Michael W. Sanderson
A zoonotic disease is any disease or infection that is naturally transmissible from vertebrate animals to humans. Over 200 zoonoses have been described (Zoonoses and the Human-Animal-Ecosystems Interface, 2013). Many zoonotic viruses are arboviruses, viruses transmitted by an infected, blood-sucking, arthropod vector (Hunt, 2010). There are several endemic arboviruses in the United States; some foreign arboviruses, such as Rift Valley fever (RVF) virus, are potential bioterrorism agents (Dar, 2013). Arboviruses, both endemic and foreign, threaten public health (Gubler, 2002) and therefore disease surveillance, vector control and public education are all vital steps in minimizing arboviral disease impact in the United States. Mosquito-borne disease threats, such as West Nile virus and Rift Valley fever, are constant concerns in the United States and globally. Current strategies to prevent and control mosquito-borne diseases utilize vector distribution, seasonal and daylight timing, and variation in population numbers. Climate factors, such as availability of still water for development of immature mosquitoes, shade, and rainfall, are known to influence population dynamics of mosquitoes. Using 1995-2011 mosquito population surveillance data from Fort Riley, Kansas, we compared population numbers of Culex tarsalis (Diptera: Culicidae), a vector of several arboviruses including West Nile virus and potentially Rift Valley fever, to a satellite-derived index of climate, the Normalized Difference Vegetation Index (NDVI) anomaly. No correlation between the population numbers and NDVI anomaly was observed, which contrasts with results from similar analyses in other locations. These findings suggest a need for continued investigation into mosquito population dynamics in additional ecological regions of the United States to better describe the heterogeneity of environment-population relationships within and among mosquito species.
Winning, Geoffrey Bruce, and res cand@acu edu au. "Vegetation Changes in a Large Estuarine Wetland Subsequent to Construction of Floodgates: Hexham Swamp in the Lower Hunter Valley, New South Wales." Australian Catholic University. School of Arts and Sciences, 2006. http://dlibrary.acu.edu.au/digitaltheses/public/adt-acuvp107.11092006.
Full textTwigger, S. N. "Late Holocene palaeoecology and environmental archaeology of six lowland lakes and bogs in North Shropshire." Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382901.
Full textBodin, Jeanne. "Observed changes in mountain vegetation of the Alps during the XXth century - Role of climate and land-use changes." Phd thesis, Université Henri Poincaré - Nancy I, 2010. http://tel.archives-ouvertes.fr/tel-00592144.
Full textSafar, Nathália Vieira Hissa. "Changes in soil and vegetation attributes during lowland Atlantic forest succession in Brazil." Universidade Federal de Viçosa, 2018. http://www.locus.ufv.br/handle/123456789/21187.
Full textMade available in DSpace on 2018-08-15T12:50:43Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1096026 bytes, checksum: 94757b424c78b7d4e3778473e3f61d24 (MD5) Previous issue date: 2018-03-09
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Distúrbios antrópicos, como a fragmentação e o desmatamento, causam a perda de biodiversidade e estoque de carbono, afetam a produção de serapilheira, causam mudanças drásticas no microclima no chão da floresta o que afeta a dinâmica dos nutrientes do solo, e consequentemente, afetam o funcionamento do ecossistema. Após uma floresta sofrer distúrbio se inicia um processo de sucessão secundária, que envolve mudanças nas comunidades de plantas e animais (principalmente artrópodes), no estoque de carbono, produção de serapilheira e nas propriedades do solo. A Mata Atlântica brasileira é uma das florestas tropicais mais diversas e ameaçadas do mundo, e sua paisagem é composta principalmente por pequenos fragmentos que se encontram em algum estádio de regeneração devido à impactos humanos passados. Esses fragmentos em regeneração desempenham um importante papel na mitigação do carbono e na conservação da biodiversidade. Para investigar as mudanças ao longo da sucessão e a resiliência de florestas de tabuleiro, nós estabelecemos três objetivos principais: (i) avaliar os efeitos do corte raso, com remoção total das árvores, nas propriedades químicas do solo e sua resiliência; (ii) avaliar os efeitos da sucessão na riqueza e composição de árvores e formigas, estoque de carbono total e acima do solo, nos componentes do solo (C orgânico, P, Al 3+ e soma de bases); e (iii) o tempo que as florestas de tabuleiro em regeneração levariam para atingir os níveis de florestas maduras próximas, para cada parâmetro. Este estudo foi conduzido em florestas preservadas e florestas em regeneração do norte do Espírito Santo, Brasil. Para atingir o objetivo (i) analisamos e comparamos dados de solo (pH, P, Al 3+ , K + , Ca 2+ + Mg 2+ ), coletados em dois momentos (1978, 2017), de uma floresta madura (controle) e uma floresta próxima que sofreu corte raso como parte de um experimento de longo prazo realizado em 1980, na Reserva da Vale (Espírito Santo, Brasil). Para atingir os objetivos (ii-iii) nós adotamos uma abordagem de cronossequências utilizando duas florestas maduras e onze florestas em regeneração com diferentes idades, distribuídas nas regiões Norte do Espírito Santo e Sul da Bahia, Brasil. Ao avaliar os efeitos do corte raso nas propriedades do solo, nossos resultados mostraram que não houve diferenças significativas entre os tratamentos para nenhum dos componentes do solo (LMM; p>0.05). Sendo assim, ambas as florestas apresentaram a mesma dinâmica do solo ao longo dos 39 anos: aumento de pH (LMM; p<0.01) e diminuição de Al 3+ trocável ao longo dos anos (LMM; p<0.001), ausência de mudanças nos níveis de P, K + e Ca 2+ + Mg 2+ (LMM; p>0.05). Estes resultados sugerem que o P disponível e as bases trocáveis, K + e Ca 2+ + Mg 2+ , sejam resistentes ao corte raso de árvores. Outros estudos comparando estes resultados com a dinâmica das árvores das mesmas áreas ajudarão a esclarecer e entender o padrão encontrado. Além disso, ao avaliar os efeitos da regeneração nos atributos florestais, encontramos relações positivas e significativas (p<0.001) entre a idade do fragmento e a riqueza e composição arbórea, a composição de espécies de formigas e o estoque de carbono total e acima do solo, sugerindo que estes parâmetros podem ser usados como indicadores de recuperação florestal. No entanto, não encontramos relação entre as propriedades do solo e o avanço da sucessão (p>0.05). Este estudo prevê que as florestas de tabuleiro em regeneração levariam cerca de 57-126 anos para recuperar a riqueza e composição de espécies de árvores e formigas, e levariam muito mais, cerca de 188 anos para recuperar o estoque total de carbono. Além disso, essas florestas estão potencialmente sequestrando 1.04 Mg C ha - yr -1 , portanto contribuindo com um importante serviço ecossistêmico que é o sequestro de CO 2 . Nossas descobertas sugerem que a riqueza de formigas e os solos de florestais ombrófilas do norte do Espírito Santo podem ser resistentes a distúrbios antrópicos. Por fim, nossos resultados mostram que as florestas de tabuleiro são resilientes, porém levariam aproximadamente de 50 a 200 anos para recuperar o estado original de biodiversidade e funcionamento ecossistêmico, evidenciando a necessidade imediata de desenvolver estratégias para selecionar áreas com maior potencial de regeneração natural.
Human disturbances, such as fragmentation and clear-cut logging, cause the loss of biodiversity and carbon stock, affect litter production, cause microclimatic changes at the forest floor, which affect soil nutrient dynamics, and consequently affect the ecosystem functioning. After a disturbance the process of secondary succession begins, which involves changes in plant and animal communities (mainly arthropods), carbon stock, litter production and soil properties. The Brazilian Atlantic forest is one of the most diverse and threatened tropical forest in the world, and its landscapes are mainly composed by small fragments that are in some stage of recovery from past human disturbance. These second-growth fragments have an important role in carbon mitigation and biodiversity conservation. To investigate the changes during forest succession and the resilience of lowland rain forests, we established three main objectives: (i) to assess the effects of whole-tree logging forest clearance on soil properties and their dynamics; (ii) to assess the effects of stand age on tree and ant species richness and composition, aboveground and total C pool, and soil nutrients (organic C, P, Al 3+ and sum of bases) and (iii) to estimate the time secondary lowland forests take to reach the mature forests levels for each parameter. This study was conducted in old-growth and second-growth lowland rain forests from northern Espírito Santo State, Brazil. To accomplish the objective (i) we analyzed and compared soil data (pH, P, Al 3+ , K + , Ca 2+ + Mg 2+ ), collected in two moments (1978, 2017), from an old-growth forest (control) and one adjacent forest that was cleared as part of a long-term experiment performed in 1980, at the Vale Natural Reserve (Espírito Santo State, Brazil). To accomplish the objective (ii-iii) we adopted a chronosequence approach with two old-growth and 11 second-growth forests at different ages, distributed in the northern Espírito Santo and southern Bahia States, Brazil. When assessing the effects of forest clearance on soil properties, we found no significant differences between treatments for any soil component (LMM; p>0.05). Thus, both forests showed the same soil dynamic along the 39 years of interval: increasing pH (LMM; p<0.01), and decreasing Al 3+ over the years (LMM; p<0.001), and no changes in P, K + and Ca 2+ + Mg 2+ (LMM; p>0.05). This result suggest that available P, and exchangeable bases K + , Ca 2+ + Mg 2+ may be resistant to whole-tree removal. Further studies comparing our results regarding the effects of forest clearance on soil properties with the long-term tree dynamic of similar forested areas will help to clarify and understand the pattern found. Moreover, when assessing the effects of forest regeneration on forest attributes, we found positive significant relations (p<0.001) between stand age and tree species richness and composition, ant species composition and carbon pool (total and aboveground), suggesting that these parameters can be used as indicators of forest recovery. However, we found no relationship between soil properties and forest regeneration (p>0.05). This study predicts that secondary lowland rain forests would take several years (57-126 yr) to recover species richness and composition, and much longer, 188 yr to recover C pool, and that these forests are potentially sequestering 1.04 Mg C ha -1 yr -1 , thus contributing to the important ecosystem service of CO 2 sequestration. Our findings suggest that ant species richness and soils of lowland forests can be resistant to human disturbances. Finally, our results indicate that lowland second-growth forests are resilient, but it would take approximately 50 to 100 years to recover the original state of biodiversity and ecosystem functioning, evidencing that we urgently need to develop strategies for selecting areas with highest natural regeneration potential.
Charles, Sean Patrick. "Saltwater Intrusion and Vegetation Shifts Drive Changes in Carbon Storage in Coastal Wetlands." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3791.
Full textOkwany, Vincent Ofafa. "Climate and vegetation relationships in southwestern Kenya and the potential impacts of a warmer world." Thesis, University of East Anglia, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278078.
Full textSperanza, Alessandra Olga Maria. "Solar and anthropogenic forcing of late-Holocene vegetation changes in the Czech Giant Mountains." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2000. http://dare.uva.nl/document/84035.
Full textWilcox, Julia K. "Recent Vegetation and Area Changes in a Tidal Marsh Located at Pope's Creek, Virginia." W&M ScholarWorks, 1989. https://scholarworks.wm.edu/etd/1539617597.
Full textMaliniemi, T. (Tuija). "Decadal time-scale vegetation changes at high latitudes:responses to climatic and non-climatic drivers." Doctoral thesis, Oulun yliopisto, 2018. http://urn.fi/urn:isbn:9789526220123.
Full textTiivistelmä Poikkeuksellisen nopea ilmastonmuutos on johtanut viime vuosikymmenten aikana muutoksiin boreaalisissa ja arktisissa kasviyhteisöissä. Muutoksiin lukeutuvat tuottavuuden lisääntyminen, levinneisyysrajojen siirtyminen sekä muutokset biodiversiteetissä, mitkä kaikki muuttavat ekosysteemien toimintaa. Kasvillisuuden dynamiikkaa säätelevät kuitenkin useat paikallistason tekijät, minkä seurauksena ei ole täysin selvää, miten kasvillisuus on eri alueilla ja habitaateissa muuttunut. Koska kasvillisuuden jatkuva monitorointi on harvinaista pohjoisilla alueilla, vanhojen kasvillisuusaineistojen uudelleenkartoituksista on tullut tärkeä menetelmä muutosten havaitsemiseksi. Tutkin väitöskirjassani vuosikymmenten kuluessa tapahtuneita (23–60 vuotta) kasvillisuusmuutoksia Pohjois-Fennoskandian metsissä, puuttomilla kankailla ja tundralla uudelleenkartoitusten ja kokeellisen tutkimuksen avulla, ja kytkin ne ilmastonmuutokseen sekä tärkeimpiin paikallisiin tekijöihin. Yleisiä trendejä uudelleenkartoitetuilla puuttomilla kankailla olivat variksenmarjan (Empetrum nigrum ssp. hermaphroditum) voimakas lisääntyminen lumensuojaisissa habitaateissa sekä jäkälien väheneminen kaikkialla. Yhteisöjen kokonaismuutos oli voimakkainta eteläisillä puuttomilla kankailla, jossa se korreloi yhtä aikaa lisääntyneiden lämpötilojen ja laidunpaineen kanssa. Kokeellinen tutkimus tundralla osoitti, että kasviyhteisöt kehittyvät hyvin erilaisiksi paikallisten tekijöiden voimakkuussuhteista riippuen, jotka voivat joko hidastaa tai nopeuttaa ympäristömuutoksista johtuvia kasvillisuusmuutoksia. Metsien uudelleenkartoitus osoitti yhteisöjen kokonaismuutoksen olevan pitkällä aikavälillä suurempaa tuottavilla maaperillä lehtometsissä verrattuna karumpiin kangasmetsiin. Tutkimuksen mukaan maaperän tuottavuus on avaintekijä, joka ennustaa kasvillisuusmuutosten voimakkuutta ilmastonmuutoksen aikana. Tästä tärkeästä löydöstä oli aiemmin pääasiassa vain kokeellista tutkimustietoa. Yleisistä trendeistä huolimatta, muutokset diversiteetissä, kasviryhmissä ja yksittäisissä lajeissa olivat kuitenkin vaihtelevia ja usein habitaatti- tai aluesidonnaisia. Väitöskirjani tulokset, jotka muodostavat myös aikasarjan tuleville tutkimuksille, osoittavat kasvillisuuden monitoroinnin ja uudelleenkartoitusten olevan ensisijaisen tärkeitä, jotta kasvillisuuden dynamiikkaa voidaan ymmärtää paremmin nopeasti muuttuvissa olosuhteissa
Bodin, Jeanne [Verfasser]. "Observed changes in mountain vegetation of the Alps during the XXth century : role of climate and land-use changes / Jeanne Bodin." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2011. http://d-nb.info/1013473574/34.
Full textBarbosa, Humberto. "Vegetation Dynamics Over the Northeast Region of Brazil and Their Connections With Climate Variability During the Last Two Decades of the Twentieth Century." Diss., The University of Arizona, 2004. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_2004_188_sip1_w.pdf&type=application/pdf.
Full textHoyt, Cathryn A. "Grassland to desert : Holocene vegetation and climate change in the northern Chihuahuan Desert /." Digital version:, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p9992819.
Full textHuhta, A. P. (Ari-Pekka). "Restorative mowing on semi-natural grasslands: community-level changes and species-level responses." Doctoral thesis, University of Oulu, 2001. http://urn.fi/urn:isbn:9514259947.
Full textSulieman, Hussein Mohamed. "Mapping and Modelling of Vegetation Changes in the Southern Gadarif Region, Sudan, Using Remote Sensing." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1199964393472-79860.
Full textStrömberg, Pernilla. "Förändringar i vegetationens sammansättning efter en våtmarksrestaurering : Changes in the vegetation composition after a wetlandrestoration." Thesis, Karlstad University, Division for Environmental Sciences, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-1715.
Full textThe loss of such great wetlands, which has arose in Sweden the last decades, has created a situation that threats both the function and the biological diversity within the wetlands. Many ecological niches can be found in the wetlands and it is one of the habitats where most different species exist. In the 17th Century people started to ditch damp environments, such as bogs, to create a productive cultivated ground. Further ditches were made when the forestry gave large economical profits. The wetlands were impoverished from both groundwater and nourishment, and this led to a great loss of species.
In a corporation with WWF and Skogsstyrelsen in Arvika, the University of Karlstad has participated in the Laskerudproject, a hydrological restoration-project in a forest landscape. The purpose of the project was to increase the groundwater level and to recreate the functions of the wetlands. The project has partly analysed the change in the vegetations composition during six years. The restoration took place in the year 2004 and the inventory of the wetland’s flora has been carried on between the years 2002 and 2007. The same 40 test-squares in Södra ängsmyren, which have been chosen at random, have been analysed every year in august; also 40 randomly chosen test-squares in Lenungen where looked at. The latter were used as a control area.
All occurring species have been analysed statistically with the parametric z- and t-test and the non-parametric Wilcoxon-test. This was made to analysed if the hypotheses that the number of alter species are more in Södra ängsmyren than in Lenungen. The hypothesis if the hydrophilic species have increased and the hydrophobic species have decreased in Södra ängsmyren was also analysed the same tests mentioned above.
The results of the analysed material showed a significant increase in two of the species in both Södra ängsmyren and Lenungen. The remainder species in Södra ängsmyren could show interesting trends, even though they were not significant. Some species in the wetlands have got a wider area of distribution, this has been visually observed. In comparison with similar studies this study shows the conclusion that more time is needed to prove the changes statistically. As a suggestion, three to five years of further data of the wetlands flora is needed to prove the changes statistically.
Pittam, Nathan J. "Aspects of vegetation and land use changes during historical times from English lowland lake records." Thesis, Coventry University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439104.
Full textMemiaghe, Herve Roland. "Old field restoration : vegetation response to soil changes and restoration efforts in Western Cape Lowlands." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/1956.
Full textIn the Mediterranean climate regions of the world, agricultural practices have caused considerable landscape transformation and lead to introduction of alien species that now dominate secondary succession on abandoned agricultural fields. Various restoration attempts have been made to reduce alien plant species cover, and to enhance the re-establishment and cover of native plant species. However, results and successes were mostly short-term due to re-growth and persistence of the weedy alien species, which has been suggested to be caused by land use history, especially the nutrient enrichment of soil, and particularly phosphorus and nitrogen. This study investigated different soil properties (pH, electrical conductivity (EC), soil moisture, as well as available phosphorus (P) and total nitrogen (N)) on 10 and 20 year old abandoned fields, as a function of depth in three habitats (ridge (old cultivated area), ditch (old drainage line) and slope (intermediate zone between ridge and ditch)) on the old fields. The relationship between these soil properties and the vegetation occurring on the two old fields was established. At the same time, restoration treatments (autumn burn, combination of autumn burn and herbicide, herbicide application alone, as well as spring burn) were conducted to reduce the cover and abundance of non-native plant species and Cynodon dactylon, and to enhance cover of native species. Results from the study show that levels of all investigated soil properties were higher on the younger field. The highest difference was observed in EC and pH. Seasonal differences in both soil properties could also be observed. A principal component analysis indicated that the dynamic of all soil properties shaped the vegetation type on old fields, with the main soil properties being dependent on land-use history and time since abandonment. This study suggests that EC and pH could be part of parameters that drive the persistence of undesirable species persistence on old fields and inhibit native plant species instead.
Herrera, Francisco F. "Decomposition and soil organic matter dynamics associated with changes in land use and vegetation cover." Thesis, University of Exeter, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368370.
Full textGunnarsson, Urban. "Vegetation changes on Swedish mires : Effects of raised temperature and increased nitrogen and sulphur influx." Doctoral thesis, Uppsala : Acta Universitatis Uppsaliensis, 2000. http://catalogue.bnf.fr/ark:/12148/cb40007342x.
Full textPartanen, S. (Sari). "Recent spatiotemporal changes and main determinants of aquatic macrophyte vegetation in large lakes in Finland." Doctoral thesis, University of Oulu, 2007. http://urn.fi/urn:isbn:9789514285950.
Full textTiivistelmä Viimeisen puolen vuosisadan aikana suomalaisiin suurjärviin on kohdistunut lukuisia muutoksia, jotka ovat vaikuttaneet järvien ekologiseen tilaan. Muutoksia ovat aiheuttaneet pääasiallisesti vesistöjen säännöstely, rehevöityminen sekä maankäytön muuttuminen. Tämän väitöskirjan tarkoituksena on analysoida noin viimeisten 50 vuoden aikana suomalaisissa suurjärvissä tapahtunutta ranta- ja vesikasvillisuuden pitkäaikaismuutosta. Historiallisilla (1947–1963) ja nykyisillä (1996–2000) ilmakuvilla, muilla kasvillisuusaineistoilla sekä useilla ympäristömuuttujilla tunnistettiin keskeisiä tekijöitä, jotka vaikuttivat kasvillisuuden esiintymiseen, runsauteen ja muutokseen. Tämän lisäksi tutkittiin rantojen pysyvän umpeenkasvun kehitysprosessia. Tutkimusta varten kasvillisuudesta kerättiin monilähdeaineistoa kaikilta Suomen päävaluma-alueilta yhteensä 24 eri järveltä, joiden koko vaihteli 41–1116 km2:n välillä. Tämän lisäksi useita vesistöjen säännöstelyn, rehevöitymisen ja geomorfologian ympäristömuuttujia kerättiin ja analysoitiin. Stereoskooppisella visuaalisella ilmakuvatulkinnalla tutkittiin yli 402 kilometriä rantaviivaa historiallisista ja nykyisistä ilmakuvista. Ilmaversoisen ranta- ja vesikasvillisuuden esiintymistä, runsautta ja historiallista muutosta analysoitiin 474 habitaattitason tutkimuspisteellä. Rantojen pysyvän umpeenkasvun esiintymistä, umpeenkasvun eri tyyppejä ja sitä määrittäviä tekijöitä tutkittiin 289 kasvilinjalla. Tutkimuksen tuloksena havaittiin, että järvitasolla vesistöjen säännöstely oli tärkein kasvillisuuden historialliseen kehitykseen vaikuttava tekijä. Huomattavimmat kasvillisuusmuutokset määräytyivät keskiveden noston, pienentyneen säännöstelyvälin, vähentyneen kevättulvan ja lasketun keskiveden tason seurauksena. Kasvillisuusmuutokset eivät olleet niin selviä, jos säännöstely muistutti luonnontilaista säännöstelyä. Rehevöityminen vaikutti ranta- ja vesikasvillisuuteen paikallisesti. Ravinteisuutta ilmentävät maankäytön muuttujat, ojat sekä maanviljelys, lisäsivät kasvillisuuden esiintymistä ja runsautta. Geomorfologiset tekijät selittivät kasvillisuuden kehitystä habitaattitasolla. Savinen maaperä sekä rannan mataluus lisäsivät vesi- ja rantakasvillisuuden esiintymistä sekä kasvillisuuden runsautta. Vesistöjen säännöstely, rehevöityminen, savinen maaperä sekä rannan mataluus lisäsivät rantojen pysyvää umpeenkasvua. Ilmaversoiset kasvilajit, järviruoko (Phragmites australis) ja järvikorte (Equisetum fluviatile), hallitsivat kasvillisuutta tutkituissa järvissä
Valayamkunnath, Prasanth. "Understanding the Role of Vegetation Dynamics and Anthropogenic induced Changes on the Terrestrial Water Cycle." Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/105061.
Full textDoctor of Philosophy
Ashcroft, Michael B. "The spatial variation of environmental factors on the Illawarra escarpment and their influence on vegetation patterns." School of Earth & Environmental Sciences - Faculty of Science, 2009. http://ro.uow.edu.au/theses/3042.
Full textAbbasova, Tahira. "Detection and analysis of changes in desertification in the Caspian Sea Region." Thesis, Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-43241.
Full textKarlsson, Hanna. "Vegetation changes and forest-line positions in the Swedish Scandes during late Holocene : anthropogenic impact vs. climate /." Umeå : Dept. of Forest Ecology and Management, Swedish University of Agricultural Sciences, 2008. http://epsilon.slu.se/200831.pdf.
Full textMoleele, Nkobi Mpho, and n/a. "Ecological change and piospheres : can the classical range succession model and its modifications explain changes in vegetation and soil around boreholes in eastern Botswana?" University of Canberra. Resource, Environmental & Heritage Science, 1994. http://erl.canberra.edu.au./public/adt-AUC20061018.144247.
Full textRyner, Maria. "Past environmental and climate changes in northern Tanzania : Vegetation and lake level variability in Empakaai Crater." Doctoral thesis, Stockholm : Department of Physical Geography and Quaternary Geology, Stockholm University, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6835.
Full textQi, Xiaoling 1956. "Changes in riparian vegetation communities of the Gila Box, Arizona, an area subject to periodic floods." Thesis, The University of Arizona, 1995. http://hdl.handle.net/10150/278470.
Full textLongo, Marcos. "Amazon Forest Response to Changes in Rainfall Regime: Results from an Individual-Based Dynamic Vegetation Model." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11268.
Full textEarth and Planetary Sciences
Otto, Mia. "Spatial and temporal changes in Fynbos riparian vegetation on selected upland rivers in the Western Cape." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86603.
Full textENGLISH ABSTRACT: Restoration practices commonly make use of a reference condition in order to restore a site to a better ecological state than it is currently in. The selection process and relevance of the reference condition has not yet been tested in upland Western Cape rivers especially with relation to spatial and temporal scales. This thesis sought to evaluate whether space (longitudinal) and time (temporal) influence riparian plant community composition (laterally), how it influences the community composition and whether these differences impacts the selection of a reference condition used in restoration practices. In order to investigate the role longitudinal position, sites were selected across three longitudinal zones: mountain stream, transitional and upper foothills. Historic sites used in a previous study on riparian vegetation of upland rivers were resampled and datasets used for temporal comparisons between undisturbed sites, sites recovering after clearing of invasive alien plants and sites affected by fire. Riparian vegetation communities showed differences between longitudinal zones, basins and rivers. The species responsible for marginal zone identity (plants in close proximity to the active channel), determined using relative cover abundance varied, with Isolepis prolifera responsible for the group identity in the mountain stream and transitional sites but in the foothills Calopsis paniculata, Drosera capensis and Metrosideros angustifolia saplings were responsible for lateral zone identity. The lower dynamic (transitional between wet and drybank) had no similarities between different longitudinal zones across rivers. In the lower zone Pteridium aqualinum was mostly responsible for the identity. The upper bank had no single species responsible for group identity. The species described to be typical for the reference condition on these particular rivers by other studies were mostly present in the comparable lateral zone but it was however not always responsible for the identity of the specific lateral zone. By comparing selected environmental variables such as horizontal distance from active channel, elevation and substrate calibre with different longitudinal zones’ riparian vegetation species distribution, different combinations were produced. The mountain streams showed the strongest relationship with horizontal distance and elevation in combination to one another and the upper foothills horizontal distance from the active channel was linked most strongly to vegetation positioning. These results confirm the importance of space when attempting to assess, study or restore riparian communities. Temporally, sites had stronger similarity to data collected during the same sampling period than with historic data. Also, the overall relative species abundance did not show significant change to be present at a site scale. The changes in community composition were found to be due to a lateral zone scale variation in species abundance. As expected the undisturbed rivers showed less variation in species responsible for temporal changes than the recovering and fire-exposed rivers. Species responsible for changes in relative abundance at a lateral zone scale were Metrosideros angustifolia, Morella serrata, Brabejum stellatifolium, Isolepis prolifera, Elegia capensis, Prionium serratum and Calopsis paniculata. Due to the species diversity not changing much temporally but the relative abundance of specific species showing much variation over time it can be concluded that the changes are not diversity based but instead driven by changes in relative abundances of species typical for a lateral zone. The spatial and temporal variation in riparian vegetation community composition was found to be significant enough to suggest that the use of a fixed reference condition for all Western Cape rivers would not be feasible due to clear differences between basins. Secondly when selecting a reference site the spatial location of this site should be within the same longitudinal zone since bank shape does influence riparian plant species distribution. Finally the temporal comparison between sites showed high diversity in species abundances but small differences in diversity overall. This would suggest that a general community description specific to 1) where the site is situated and 2) based on the present riparian vegetation community composition within a specific basin may be more realistic and achievable for restoration and environmental management purposes as opposed to using site descriptions from the past and reference sites too far upstream or downstream from the restoration site.
AFRIKAANSE OPSOMMING: Herstel praktyke maak algemeen gebruik van 'n verwysing toestand om 'n terrein te herstel na 'n beter ekologiese toestand as wat dit tans is. Die keuringsproses en relevansie van die verwysing toestand is nog nie in die boonste gedeeltes van Wes-Kaap Riviere getoets nie, veral met betrekking tot ruimtelike en tydskale nie. Hierdie tesis het gesoek om te evalueer of ruimte (longitudinaal) en tyd (temporaal) rivieroewers plant gemeenskap samestelling (lateraal) beïnvloed en of hierdie verskille die keuse van 'n verwysing toestand in die herstel praktyke beïnvloed. Ondersoek terreine was oor drie longitudinale sones geselekteer: berg stroom, oorgangs en boonste hange terreine. Historiese terreine was weer ondersoek en die datastelle was gebruik vir die temporale vergelykings tussen onversteurde terreine, terreine wat herstel na die skoonmaak van indringer spesies en wat geraak was deur 'n brand. Oewerplantegroei gemeenskappe het verskille tussen longitudinale sones, rivier-kom en rivier takke gewys. Die spesies wat verantwoordelik was vir marginale zone (plante in nabye afstand met die aktiewe rivier kanaal) identiteit, bepaal met behulp van relatiewe dekking hoeveelheid, het gevarieer met Isolepis prolifera verantwoordelik vir die groep identiteit in die berg stroom en oorgangs trerreine, maar in die boonste hange was dit Calopsis paniculata, Drossera capensis en Metrosideros angustifolia boompies wat verantwoordelik was vir die laterale sone identiteit. Die laer dinamiese area het geen ooreenkomste tussen marginale gebiede van verskillende longitudinale sones gehad nie. In die onderste sone was Pteridium aqualinum meestal verantwoordelik vir die groepering se identiteit. Die boonste bank het nie 'n enkele spesie wat verantwoordelik was vir die groep identiteit gehad nie. Die spesies beskryf as tipies vir die laterale sone deur Reinecke et al. (2007) was meestal teenwoordig in die beskryfde laterale sone van hierdie studie, maar dit was egter nie altyd verantwoordelik vir die identiteit van die laterale sone gemeenskap nie. Verskillende lengte sones het gekorreleer met verskillende omgewingsveranderlikes wat sterkste gekoppel kon word aan die verspreiding van spesies. Die bergstrome het die sterkste verhouding met horisontale afstand en hoogte in kombinasie met mekaar gehad en in die boonste hange was horisontale afstand van die aktiewe kanaal die sterkste gekoppel aan plantegroei posisie. Die belangrikheid van ruimte is onmiskenbaar ten opsigte van evaluering, bestudering en die herstel van rivieroewers gemeenskappe. Terreine het sterker ooreenkoms met data gehad wat tydens dieselfde tydperk versamel was, as met historiese data. Die algehele relatiewe spesies hoeveelheid het egter nie beduidende verandering getoon op 'n terrein skaal nie. Soos verwag was het die onversteurde riviere minder temporale variasie in spesies getoon as die herstellende en brand blootgestelde riviere. Spesies wat verantwoordelik was vir die verandering in relatiewe hoeveelhede op 'n laterale sone skaal was M. angustifolia, Morella serrata, Brabejum stellatifolium, I. prolifera, Elegia capensis, Prionium serratum en C. paniculata. As gevolg van die diversiteit van spesies wat nie baie verander het tydelik nie, maar die relatiewe hoeveelheid van spesifieke spesies wat heelwat variasie oor tyd getoon het, kan dit afgelei word dat die veranderinge nie diversiteit gebaseerd was nie, maar eerder gedryf was deur veranderinge in relatiewe hoeveelhede van tipiese spesies in 'n laterale sone. Die ruimtelike en tydelike variasie in oewerplantegroei gemeenskap samestelling was beduidende genoeg om voor te stel dat die gebruik van 'n vaste verwysing toestand vir alle Wes-Kaapse riviere nie haalbaar sou wees nie as gevolg van duidelike verskille tussen riviere. Tweedens, by die kies van 'n verwysing terrein moet die ruimtelike plek van hierdie terrein in dieselfde lengte sone wees aangesien bank vorm 'n invloed op rivieroewer plant verspreiding het. Laaastens, het die tydelike vergelyking tussen terreine hoë diversiteit in spesies verspreidings maar klein verskille in algehele diversiteit gehad. Dit stel voor dat 'n algemene beskrywing van die gemeenskap wat spesifiek op 1) waar die terrein geleë is en 2) gebaseer op die huidige oewerplantegroei gemeenskap samestelling binne 'n spesifieke rivier netwerk dalk meer realisties en haalbaar vir hersteel en bestuurs doeleindes sou wees. Hierdie benadering word verkies bo die gebruik van n terrein beskrywings uit die verlede en verwysing terreine te ver stroomop of stroomaf van die herstel gebied.
Kurzman, Amanda Lord. "Changes in major solute chemistry as water infiltrates soils comparisons between managed agroecosystems and unmanaged vegetation /." Diss., Connect to online resource - MSU authorized users, 2006.
Find full textTang, Guoping. "An examination of vegetation modeling-related issues and the variation and climate sensitivity of vegetation and hydrology in China." Thesis, Connect to title online (Scholars' Bank) Connect to title online (ProQuest), 2008. http://hdl.handle.net/1794/8543.
Full textTypescript. Includes vita and abstract. Includes bibliographical references (leaves 128-156). Also available online in Scholars' Bank; and in ProQuest, free to University of Oregon users.
Colwell, Stephanie Renee. "Characterization of Upland/Wetland Community Types: Changes to Flatiron Lake Bog over a 24-Year Period." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243443626.
Full textMarlon, Jennifer R. "The geography of fire: A paleo perspective." Thesis, University of Oregon, 2009. http://hdl.handle.net/1794/10334.
Full textFire is a fundamental, transformative, yet poorly understood process in the Earth system; it can radically reorganize ecosystems, alter regional carbon and energy balances, and change global climate. Short-term fire histories can be reconstructed from satellite (seasonal- to interannual-scales), historical (decadal scales), or dendrochronological records (for recent centuries), but only sedimentary charcoal records enable an analysis of the complex interactions between climate, vegetation and people that drive fire activity over longer temporal scales. This dissertation describes the compilation, synthesis and analysis of a global paleofire dataset and its application to understanding past, current, and future changes in fire activity. Specifically, I co-led efforts to compile charcoal records around the world into a single database, and to conduct three meta-analyses to understand the controls on fire at multiple spatial and temporal scales. The first meta-analysis reconstructed global biomass burning since the Last Glacial Maximum (LGM) 21,000 years ago. Results from this study demonstrated that global fire activity is low when conditions are cool and high when conditions are warm. This fundamental relationship between climate and fire is due in large part to associated changes in vegetation productivity. The second meta-analysis examined fire activity in North America during past abrupt climate changes and looked for evidence of continental-scale wildfires associated with a hypothesized comet impact ∼13,000 years ago. This analysis found a correlation between increased fire activity and abrupt climate change, but provided no evidence for continental-scale wildfires. A final meta-analysis disentangled the climate and human influences on global biomass burning during the past 2000 years; it found a close relationship between climate change and biomass burning until ∼1750 A.D., when human activities became a primary driver of global fire activity. Together, these three meta-analyses demonstrate that climate change is the primary control of global fire activity over long time scales. In general, global fire activity increases when the Earth's climate warms and decreases when climate cools. The paleofire data and analyses suggest that the rapid climate changes projected for coming decades will lead to widespread increases in fire frequency and biomass burning. This dissertation includes previously published and unpublished co-authored material.
Committee in charge: Patrick Bartlein, Chairperson, Geography; Daniel Gavin, Member, Geography; W. Andrew Marcus, Member, Geography; Cathy Whitlock, Member, Geography; Ronald Mitchell, Outside Member, Political Science
Bjorkman, Anne Donahey. "Changes in the landscape and vegetation of southeastern Vancouver Island and Saltspring Island, Canada since European settlement." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/3421.
Full textTamang, Bijay. "Vegetation and soil quality changes associated with reclaiming phosphate-mine clay settling areas with fast-growing trees." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011871.
Full textWills, Timothy Jarrod 1974. "Succession in sand heathland at Loch Sport, Victoria : changes in vegetation, soil seed banks and species traits." Monash University, Dept. of Biological Sciences, 2002. http://arrow.monash.edu.au/hdl/1959.1/7742.
Full textFer, Istem [Verfasser], and Florian [Akademischer Betreuer] Jeltsch. "Modeling past, present and future climate induced vegetation changes in East Africa / Istem Fer ; Betreuer: Florian Jeltsch." Potsdam : Universität Potsdam, 2018. http://d-nb.info/1218404663/34.
Full textWard, Steven. "Reconstructing Vegetation Dynamics from Archaeological Cave Sites in the Western Mediterranean: Links with Climate and Cultural Changes." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487148.
Full textBrunelle-Daines, Andrea. "Holocene changes in fire, climate and vegetation in the northern Rocky Mountains of Idaho and western Montana /." view abstract or download file of text, 2002. http://wwwlib.umi.com/cr/uoregon/fullcit?p3061935.
Full textTypescript. Includes vita and abstract. Includes bibliographical references (leaves 170-178). Also available for download via the World Wide Web; free to University of Oregon users.
Oksanen, P. O. (Pirita O. ). "Development of palsa mires on the northern European continent in relation to Holocene climatic and environmental changes." Doctoral thesis, University of Oulu, 2005. http://urn.fi/urn:isbn:9514278895.
Full textGormally, Joshua. "Changes in riparian vegetation following release of reclaimed effluent water into the Santa Cruz River: As a corollary, the effects of channelization on vegetation in the Santa Cruz River." Thesis, The University of Arizona, 2002. http://hdl.handle.net/10150/278792.
Full textLouderback, Lisbeth A. "Changes in vegetation and human adaptation from the latest Pleistocene to late Holocene in the eastern Great Basin : the Blue Lake pollen record /." abstract and full text PDF (UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1446788.
Full text"May 2007" Includes bibliographical references (leaves 138-151). Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2008]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.
Leeper, Ronnie. "Near-surface Atmospheric Response to Simulated Changes in Land-cover Vegetation Fraction, and Soil Moisture over Western Kentucky." TopSCHOLAR®, 2009. http://digitalcommons.wku.edu/theses/108.
Full text