Dissertations / Theses on the topic 'Understory plants'
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Brooke, Molly Muir. "The fate of Chinese understory species in coniferous forests of the Pacific Northwest : the role of light." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Thesis/Fall2006/m_brooke_121306.pdf.
Full textNelson, Cara Ritchie. "Effects of timber harvest and forest edges on abundance, viability, and physiology of understory plants in Pseudotsuga forests of western Washington /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/5553.
Full textWebster, Bobbie J. "Response of the understory to low intensity prescribed burning or mechanical and herbicide treatment in a northern mesic eastern white pine (Pinus strobus L.) forest in the Menominee Nation, Wisconsin /." Link for full-text, 2008. http://epapers.uwsp.edu/thesis/2008/Webster1.pdf.
Full textSubmitted in partial fulfillment of the degree Master of Science in Natural Resources (Forest Ecology), College of Natural Resources. Includes bibliographical references (leaves 122-128).
Tyler, Marnie W. "Forests of the western Olympic Peninsula : understory plant species diversity, forest policy, and landscape pattern /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/5464.
Full textSmith, Jason Richard. "Seral stage, site conditions, and the vulnerability of understory plant communities to forest harvesting /." Burnaby B.C. : Simon Fraser University, 2005. http://ir.lib.sfu.ca/handle/1892/2024.
Full textTheses (School of Resource and Environmental Management) / Simon Fraser University. Research Project (School of Resource and Environmental Management) / Simon Fraser University.
Jones, Jeffrey W. "Predicting measures of diversity for forest regeneration using site and overstory variables a regression approach /." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3548.
Full textTitle from document title page. Document formatted into pages; contains v, 50 p. : ill. (some col.), maps (some col.). Includes abstract. Includes bibliographical references (p. 35-38).
Goodwin, Nicholas R. School of Biological Earth & Environmental Sciences UNSW. "Assessing understorey structural characteristics in eucalypt forests: an investigation of LiDAR techniques." Awarded by:University of New South Wales. School of Biological, Earth and Environmental Sciences, 2006. http://handle.unsw.edu.au/1959.4/28365.
Full textMacaulay, Lisa Ann University of Ballarat. "The floristic composition and regeneration characteristics of Buloke (Allocasuarina luehmannii) woodland of the Wimmera, Victoria." University of Ballarat, 2006. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/12768.
Full textMaster of Applied Science
Macaulay, Lisa Ann. "The floristic composition and regeneration characteristics of Buloke (Allocasuarina luehmannii) woodland of the Wimmera, Victoria." Thesis, University of Ballarat, 2006. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/65156.
Full textMaster of Applied Science
Macaulay, Lisa Ann. "The floristic composition and regeneration characteristics of Buloke (Allocasuarina luehmannii) woodland of the Wimmera, Victoria." University of Ballarat, 2006. http://archimedes.ballarat.edu.au:8080/vital/access/HandleResolver/1959.17/14602.
Full textMaster of Applied Science
DeMars, Brent Gordon. "Nutrient dynamics and resorption in four understory woodland plants and notes on the mycorrhizal status of some typically nonmycorrhizal plants /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487863429091484.
Full textAbrahamson, Ilana. "ASSESSING THE PERFORMANCE OF SAMPLING DESIGNS FOR MEASURING ABUNDANCE OF UNDERSTORY PLANTS AFTER FOREST RESTORATION." The University of Montana, 2009. http://etd.lib.umt.edu/theses/available/etd-05292009-123224/.
Full textGilbert, Benjamin. "Determinants of native and non-native plant distributions in a temperate forest understory." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19731.
Full textFerence, Christopher Gregory. "Detection of understory indicator plants using Compact Airborne Spectrographic Imager (casi) imagery in Kananaskis Country, Alberta." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ54704.pdf.
Full textSantala, Kierann R. "THE INTRODUCTION OF NATIVE FOREST FLOOR PLANT SPECIES INTO THE INDUSTRIALLY DISTURBED FORESTS OF SUDBURY, ONTARIO, CANADA." Thesis, Laurentian University of Sudbury, 2014. https://zone.biblio.laurentian.ca/dspace/handle/10219/2147.
Full textGillespie, Melina Jane. "Establishment success of native understorey species on coal mine rehabilitation areas in the Hunter Valley, New South Wales /." St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17522.pdf.
Full textAddessi, Andrew David. "Urban Impacts to Forest Productivity, Soil Quality, and Canopy Structure in Forest Park, Portland, Oregon." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3881.
Full textPittsenbarger, Mark Alan. "A Study of Understory Plant Recovery After a Forest Fire in the Columbia River Gorge." PDXScholar, 1994. https://pdxscholar.library.pdx.edu/open_access_etds/4772.
Full textCopp, Sara Rose. "Community level impacts associated with the invasion of English ivy (Hedera spp.) in Forest Park: a look at the impacts of ivy on community composition and soil moisture." PDXScholar, 2014. https://pdxscholar.library.pdx.edu/open_access_etds/2024.
Full textZanelli, Carolina Brandão 1986. "Florística e fotossociologia da comunidade lenhosa no sub-bosque de um cerradão em Assis, SP." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/315521.
Full textDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia
Made available in DSpace on 2018-08-22T23:57:55Z (GMT). No. of bitstreams: 1 Zanelli_CarolinaBrandao_M.pdf: 11021724 bytes, checksum: 074f594a75e3131636ec29a9f0cdbc07 (MD5) Previous issue date: 2013
Resumo: A regeneração consiste no processo de reconstrução e reorganização da composição e estrutura de uma comunidade vegetal, e vem sendo bem estudada em florestas ombrofilas e estacionais sob a ótica da dinâmica de clareiras e da sucessão ecológica. No entanto, a regeneração de espécies lenhosas no cerrado ainda e pouco compreendida, e são poucos os estudos que avaliam conjuntamente o dossel e o sub-bosque em áreas de cerrado. O objetivo deste trabalho foi avaliar a floristica e a fitossociologia da comunidade lenhosa do dossel e do sub-bosque de um cerradão em Assis, SP. O trabalho foi realizado na Estação Ecológica de Assis, em uma parcela permanente de 10,4 ha, parte do "Projeto Parcelas Permanentes" do Programa BIOTA/FAPESP. Essa parcela permanente e subdividida em 256 subparcelas contiguas de 20 m x 20 m, das quais 100 foram sorteadas para amostragem. Para avaliar o dossel, foram considerados os dados já coletados no Projeto Parcelas Permanentes, referentes aos indivíduos lenhosos com perímetro na altura do peito (PAP) ? 15 cm, para as 100 subparcelas sorteadas. Para analisar o sub-bosque, foi delimitado um setor de avaliação de 2 m x 2 m em cada subparcela sorteada, onde foram medidos e identificados todos os indivíduos de espécies lenhosas com altura > 20 cm e PAP < 15 cm. Todas as espécies do dossel e do sub-bosque foram classificadas de acordo com o habitat, com base em estudos regionais de fitossociologia, em categorias não excludentes: floresta (F), quando ha registro da espécie em formações florestais não pertencentes ao cerrado sensu lato; cerradão (C), quando ha registro da espécie em cerradão; e cerrado sensu lato (c), quando ha registro da espécie nas demais fisionomias de cerrado sensu lato. Alem disso, foram calculados os parâmetros fitossociologicos usuais para todas as espécies no dossel e no sub-bosque. Tanto o dossel quanto o sub-bosque do cerradão em Assis foram compostos por espécies intermediarias entre diferentes habitats, a maior parte (46% das espécies no dossel e 36% no sub-bosque) constituída de espécies de cerrado/cerradão, incluindo espécies de ampla distribuição no domínio (como Bowdichia virgilioides, Machaerium acutifolium, Plathymenia reticulata, Pouteria ramiflora, Qualea grandiflora, Roupala montana e Xylopia aromática) e comuns em cerrados da província Meridional (como Eriotheca gracilipes, Eugenia pluriflora, Gochnatia polymorpha, Machaerium brasiliense, Myrcia venulosa e Ocotea corymbosa). Regenerantes das espécies do dossel constituíram a maior parte do sub-bosque do cerradão, tanto em numero de espécies (81% do total, n=60) quanto em valor de importância (221 do total de 300). O cerradão apresentou um conjunto de espécies de sub-bosque composto por arvores de pequeno porte e arbustos heliofitos que também ocorrem nas fisionomias mais abertas de cerrado, incluindo: Lacistema hasslerianum, Miconia albicans, Miconia langsdorffii, Miconia stenostachya, Palicourea marcgravii, Piptocarpha rotundifolia, Psychotria hoffmannseggiana e Psychotria vellosiana. Esse resultado e consistente com as características estruturais do dossel do cerradão, que possibilitam maior entrada de luz ao sub-bosque; e contrasta com o relatado para outras fisionomias florestais, onde as espécies de sub-bosque são tipicamente tolerantes a sombra
Abstract: Regeneration consists on the process of reconstruction and reorganization of the structure and composition of a plant community, and has been intensively studied in ombrophilous and seasonal forests according to the paradigm of gap dynamics and ecological succession. However, regeneration of woody plant species in the cerrado is still poorly understood, and few studies evaluate both the overstory and the understory in cerrado areas. The aim of this study was to investigate the floristics and phytosociology of the woody community of the overstory and understory in a cerradao fragment at Assis, Sao Paulo State, southeastern Brazil. Field work was conducted at Assis Ecological Station, in a 10,4 ha permanent plot, part of the Permanent Plots Project from the BIOTA/FAPESP Program. This plot is divided in 256 contiguous subplots of 20 m x 20 m, of which 100 subplots were randomly selected and analyzed. To study the overstory, we used data collected at the Permanent Plots Project, regarding all woody individuals with perimeter at breast height (PBH) ? 15 cm, for these 100 subplots. To study of the understory, we delimited a sector of 2 m x 2 m within each selected subplot, in which all woody individuals with height > 20 cm and PBH < 15 cm were measured and identified. All overstory and understory species were categorized according to their habitat, based in regional phytosociological studies, into non excluding groups: forest (F), when there is record of the species in forest formations that do not belong to cerrado sensu lato; cerradao (C), when there is record of the species in cerradao; and cerrado sensu lato (c), when there is record of the species in the remaining cerrado sensu lato physiognomies. We also calculated the usual phytosociological parameters for all overstory and understory species. Both the overstory and the understory in the study site were composed of species of intermediate distribution between habitats, the majority (46% of overstory species and 36% of understory species) occurring in cerrado/cerradão, including widely distributed Cerrado species (such as Bowdichia virgilioides, Machaerium acutifolium, Plathymenia reticulata, Pouteria ramiflora, Qualea grandiflora, Roupala montana e Xylopia aromatica) and common southern Cerrado species (such as Eriotheca gracilipes, Eugenia pluriflora, Gochnatia polymorpha, Machaerium brasiliense, Myrcia venulosa e Ocotea corymbosa). Regenerating individuals belonging to overstory species accounted for most of the cerradão understory, both in number of species (81%, n=60) and importance value (221 of the total of 300). At the cerradão, we observed a group of understory species composed of heliophyte and small sized trees and shrubs that also occur in the open cerrado physiognomies, such as: Lacistema hasslerianum, Miconia albicans, Miconia langsdorffii, Miconia stenostachya, Palicourea marcgravii, Piptocarpha rotundifolia, Psychotria hoffmannseggiana e Psychotria vellosiana. This result is consistent with the structural characteristics of the cerradão overstory, which enable light penetration to the understory; and differs from data reported in other forest formations, where understory species are typically shade tolerant
Mestrado
Biologia Vegetal
Mestre em Biologia Vegetal
Clarkson, Matthew Thomas. "An evaluation of a 3D sampling technique and LiDAR for the determination of understory vegetation density levels in pine plantations." Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-03122007-192344.
Full textMcdonald, Shannon Lee. "Understory Diversity and Succession on Coarse Woody Debris in a Coastal, Old-growth Forest, Oregon." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/1045.
Full textKlinka, Karel. "Plant diversity in old-growth and second-growth stands in the coastal rainforests of British Columbia." Forest Sciences Department, University of British Columbia, 1997. http://hdl.handle.net/2429/652.
Full textVan, Winkle Jill Elise. "Informal Trails and the Spread of Invasive Species in Urban Natural Areas: Spatial Analysis of Informal Trails and their Effects on Understory Plant Communities in Forest Park, Portland, Oregon." PDXScholar, 2014. https://pdxscholar.library.pdx.edu/open_access_etds/1841.
Full textWilfong, Bryan N. "Detecting an invasive shrub in deciduous forest understories using remote sensing." Oxford, Ohio : Miami University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1217288997.
Full textKlinka, Karel, Gordon J. Kayahara, and Christine Chourmouzis. "Regeneration, growth and productivity of trees within gaps of old-growth forests on the outer coast (CWHvh2) of British Columbia." Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/669.
Full textSmith, Kimberly J. "Understory Plant Responses to Uneven-Aged Forestry." ScholarWorks @ UVM, 2007. http://scholarworks.uvm.edu/graddis/216.
Full textWikberg, Per-Erik. "Occurrence, morphology and growth of understory saplings in Swedish forests /." Umeå : Dept. of Silviculture, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/s322.pdf.
Full textChipman, Sylvia Joanne. "Understory vascular plant species diversity in the mixedwood boreal forest of western Canada." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0021/MQ55200.pdf.
Full textKlinka, Karel. "Structure and regeneration of old-growth stands in the engelmann spruce - subalpine fir zone." Forest Sciences Department, University of British Columbia, 1998. http://hdl.handle.net/2429/661.
Full textDelerue, Florian. "Dynamique de population d'une légumineuse du sous-bois de la forêt landaise (Ulex europaeus) dans le cadre de la sylviculture du pin maritime : proposition d'un modèle conceptuel." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00873385.
Full textFaulkner, Alexander B. "Effects of Alliaria petiolata on Native Understory Plant Communities in a Central Illinois Pine Forest." Thesis, Bradley University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10683164.
Full textLand managers and researchers are currently concerned with expanding populations of invasive species across North America. Invasive species are non-native species, introduced intentionally or unintentionally to an environment, which have the potential to cause economic or ecological damage through modifications of biodiversity and structure of the resident community that it invades. While a great deal of attention has been given to the negative effects of non-natives, research regarding the community-level effects in native Illinois natural areas is limited at best. We address the issue of invasive species at the plant community level by assessing the impact that Eurasian native Alliaria petiolata (M. Bieb) Cavara and Grande (Brassicaceae) has on pine plantation understory communities at Sand Ridge State Forest (Mason County, IL). Alliaria petiolata is a biennial species possessing a multitude of characteristics that promote its success as an invasive plant across much of the United States. To properly evaluate the community-level response of Sand Ridge State Forest to invasion by garlic mustard, we experimentally invaded 72 plots with A. petiolata seeds or rosette transplants and subjected plots to different mineral nutrient amendments and management techniques. Alliaria petiolata population density was monitored over a 5-year period to evaluate the susceptibility of Sand Ridge State Forest to invasion, and a vegetative census was conducted to assess the effects of A. petiolata invasions on native understory plant communities using species richness (S), equitability (J), and the Shannon diversity index (H’) as indicators. We present evidence that A. petiolata densities significantly increased over time, and that altering nutrient availability or management practices do not differentially affect the success of invasive A. petiolata at Sand Ridge State Forest. Additionally, we found that A. petiolata invasions do result in reduced diversity in this system, however nitrogen availability and management practices can modulate diversity losses.
Bottorff, Quinn W. "Fire skips and understory plant diversity in an upper foothills - subalpine forest in northwestern Alberta." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60414.pdf.
Full textKenlan, Peter H. "The Effects of Experimental Acidification on Understory Plant Communities at the Bear Brook Watershed in Maine." Fogler Library, University of Maine, 2006. http://www.library.umaine.edu/theses/pdf/KenlanPH2006.pdf.
Full textBegley, Danielle Rae. "Long-term Effects of Deer Browsing on Northern Wisconsin Forest Plant Communities." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1371743595.
Full textNoyes, Mark Lee. "Tree Canopy Increases Native Woody Understory Richness and Abundance in a Grazed Oak Woodland System." Thesis, University of California, Davis, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1546238.
Full textWithin Mediterranean ecosystems, conservation and restoration action is becoming increasingly necessary to preserve biological diversity within these working landscapes. Many of these systems have been managed to increase forage production through the removal of canopy trees and shrubs, resulting in understories dominated by herbaceous species. In California, woody plant regeneration can be constrained by exotic annual grasses, particularly in the presence of grazing. Quercus douglasii and other oak species are known to indirectly facilitate and provide spatial refuges to native plants through competitive suppression of herbaceous productivity. Mature trees can also compete with understory recruits and shrub species, limiting their occurrences to interstitial canopy gaps and resulting in reduced competition for resources. This study surveyed the overstory composition of 34 study plots at the Sierra Foothill Research and Extension Center to determine the effects of tree canopies on the occurrence and distribution of native woody species in the undergrowth. Because other studies have shown safesites, which include rock outcroppings, woodpiles, and nurse plants to facilitate woody plant establishment in this system, the microsites containing individual plants were recorded to determine the distribution of different woody species. Multivariate regressions showed that understory plant richness and abundance increased with higher levels of canopy cover, suggesting that mature trees play a role in maintaining understory diversity. The majority of stems were found growing directly underneath the canopy, with only one species established primarily in interstitial areas. Restoration strategies can utilize the natural distributions of woody species in the understory in order to increase the survival of plantings while continuing to manage these systems for multiple ecosystem services.
Trimbath, Ryan John. "The Combined Effects of White-tailed Deer and Exotic Earthworms on Understory Plant Communities in Northeast Ohio." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1405359401.
Full textStam, Barton R. "Quantifying Losses of Understory Forage in Aspen Stands on the Dixie and Fishlake National Forests." DigitalCommons@USU, 2004. https://digitalcommons.usu.edu/etd/6592.
Full textKöchy, Martin, and Sven Bråkenhielm. "Separation of effects of moderate N deposition from natural change in ground vegetation of forests and bogs." Universität Potsdam, 2008. http://opus.kobv.de/ubp/volltexte/2008/1662/.
Full textFuller, Leslie A. "Isolated tree canopy effects on understory plant composition and soil characteristics in three black oak savanna sites of northern Indiana." Virtual Press, 1998. http://liblink.bsu.edu/uhtbin/catkey/1115739.
Full textDepartment of Natural Resources and Environmental Management
Berry, Eric J. "Population ecology of the harvested understory palm Chamaedorea radicalis pollination biology, female fecundity, and source-sink population dynamics /." Oxford, Ohio : Miami University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=miami1151350945.
Full textSpence, Laura Alexandra. "Exotic plant invasion in a New Zealand forest understorey : the roles of natural disturbance, species diversity, and mycorrhizal fungi." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611846.
Full textElla, Ghislain. "Gap regeneration in the Tsitsikamma forest (Easter Cape, South Africa) : the effect of gap size and origin." Thesis, Stellenbosch : Stellenbosch University, 2005. http://hdl.handle.net/10019.1/20916.
Full textENGLISH ABSTRACT: Recognizing the biological significance of gaps, the South African Department of Water Affairs and Forestry (DWAF) in 1989 initiated a Gap Dynamics Project in the indigenous forests of Tsitsikamma (Eastern Cape, South Africa). This consists of three sub-projects: Koomansbos (9300 m2), created by a ground fire in 1989; Plaatbos (1600 m2), made by a Podocarpus falcatus (Thunb.) R. Br. ex Mirb. (Podocarpaceae) windfall in 1994; and nine gaps of different sizes, artificially created by selective tree felling in 1995: three small (100-150 m2), three medium (300-500 m2) and three large (800-1000 m2). All the gaps were surveyed after creation and permanent plots were established for subsequent monitoring. The current timber harvesting system practiced in South African indigenous forests attempts to minimize gap size. It has been proposed by Euston-Brown et al. (1996) that this practice is likely to benefit the more shade tolerant species, but may inhibit the regeneration of less shade tolerant plants in the forest. Therefore, the present study aimed to verify two hypotheses: gaps may close in a process that is determined by their size, their origin and the plant species characteristics; soil quality might change inside those gaps. For the purpose of the study, the gaps cited above were re-surveyed between 2002 and 2003. It was found that: 1) there was little clear difference in the community structure of plant species between gaps of different sizes and origins; as expected from the species-area relationship, large gaps had higher species richness, plant diversity and herbaceous percentage cover than medium and small gaps; diversity indices were higher in the large windfall gap than in the large fire and artificial gaps; generally, context and stochastic events were largely more important in determining gap diversity and regeneration than gap sizes and origins; 2) diversity indices in the gaps were higher than recorded previously; 3) soil pH and Electrical Conductivity were respectively lower and higher inside the gaps than adjacent to them; these variations were statistically significant. Present data on the vegetation in the gaps were compared to past measurements, and future vegetation structure has been predicted, as a function of current gap vegetation. Recommendations have been made for sustainable management of the indigenous forest of Tsitsikamma.
AFRIKAANSE OPSOMMING: Voortspruitend uit die erkenning van die biologiese belang van gapings, het die Suid-Afrikaanse Departement van Waterwese en Bosbou (DWB) in 1989 'n projek oor gapingsdinamika in die inheemse woude van Tsitsikamma (Oos-Kaap, Suid-Afrika) geïnisieer. Dit bestaan uit drie subprojekte: die gaping in Koomansbos (9300 m2) wat in 1989 deur 'n grondvuur geskep is; die gaping in Plaatbos (1600 m2) wat veroorsaak is toe bome van die spesie Podocarpus falcatus (Thunb.) R. Br. ex Mirb. (Podocarpaceae) in 1994 omgewaai is; en nege gapings van verskillende groottes wat in 1995 kunsmatig deur geselekteerde boomkappery geskep is: drie is klein (100-150 m2), drie mediumgrootte (300-500 m2) en drie groot (800-1000 m2). Alle gapings is ná hulle ontstaan opgemeet en ondersoek en permanente terreine is vir daaropvolgende monitering gevestig. Die stelsel wat tans vir die oes van hout in Suid-Afrikaanse inheemse woude gebruik word, poog om die grootte van gapings te minimaliseer. Euston Brown et al. (1996) doen aan die hand dat hierdie praktyk spesies wat meer skaduweeverdraagsaam is waarskynlik sal bevoordeel, maar die regenerasie van plante in die woud wat minder skaduweeverdraagsaam is, kan inhibeer. Hierdie studie het dus ten doel gehad om twee hipoteses te verifieer: Gapings kan toegroei in 'n proses wat deur hul grootte, oorsprong en die eienskappe van die plantspesies bepaal word; en die gehalte van die grond binne daardie gapings kan verander. Die gapings waarna hierbo verwys is, is vir die doel van hierdie studie tussen 2002 en 2003 weer gemonitor. Daar is bevind dat: 1) daar min duidelike verskille was tussen die gemeenskapstruktuur van plantspesies tussen gapings van verskillende groottes en oorsprong; soos van die verhouding tussen spesies en area verwag kan word, het groter gapings 'n hoër spesierykheid, plantdiversiteit en persentasie niehoutagtige dekking as medium- en klein gapings gehad; diversiteitsindekse was hoër in die groot Plaatbosgaping as in die groot Koomansbosgaping of die kunsmatige gapings; in die algemeen was konteks en stochastiese gebeure grootliks belangriker in die bepaling van gapingsdiversiteit en -regenerasie as gapingsgrootte of -oorsprong; 2) diversiteitsindekse in die gapings was hoër as wat voorheen aangeteken is; en 3) grond-pH en elektriese geleidingsvermoë was onderskeidelik laer en hoër binne die gapings as neffens hulle; hierdie variasies was statisties beduidend. Huidige data oor die plantegroei in die gapings is met vorige metings vergelyk, en 'n toekomstige plantegroeistruktuur is as 'n funksie van huidige gapingsplantegroei voorspel. Aanbevelings is gemaak rakende die volhoubare bestuur van Tsitsikamma se inheemse woud.
Bryce, Elizabeth. "Inflence of Silvicultural Treatment, Site Characteristics, and Land Use History on Native and Nonnative Forest Understory Plant Composition on the Penobscot Experimental Forest in Maine." Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/BryceE2009.pdf.
Full textKlinka, Karel, H. Qian, Pavel Krestov, and Christine Chourmouzis. "Species diversity and floristic relationships of the understory vegetation in black spruce and trembling aspen stands in the boreal forest of British Columbia." Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/762.
Full textManninen, O. (Outi). "The resilience of understorey vegetation and soil to increasing nitrogen and disturbances in boreal forests and the subarctic ecosystem." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526211732.
Full textTiivistelmä Ilmaston muutos ja siitä aiheutuvan lämpenemisen vaikutus kasvillisuuteen ja maaperään on laajasti tunnustettu ilmiö. Lämpenemisen lisäksi pohjoisten alueiden aluskasvillisuuteen kohdistuu useita muutospaineita, kuten lisääntynyt typpipitoisuuden nousu ja kasvillisuutta muokkaavat häiriöt. Tässä tutkimuksessa mitattiin lisääntyneen typpipitoisuuden ja häiriöiden vaikutus kasvillisuuden biomassaan ja runsauteen sekä yhteisörakenteeseen, sekä kasvilajeihin, maaperään ja mikrobibiomassaan sitoutuneen typen ja hiilen määrään. Lisäksi tutkittiin yleisimpien varpukasvien (lehtensä pudottava mustikka, ikivihreät puolukka ja variksenmarja) siemenellistä lisääntymistä kokeellisen häiriön (kasvillisuuden tai maaperän poisto) jälkeen. Tutkimukset tehtiin boreaalisessa ja subarctisessa ekosysteemeissä sekä metsänrajaympäristössä Pohjois-Suomessa. Typpilannoitus ja häiriöt lisäsivät heinien määrää kasviyhteisöissä. Lisäksi typpilannoitus edisti heinien kasvullista palautumiskykyä häiriön jälkeen, joka johti kasvillisuuden homogenisoitumiseen ja kasviyhteisön uuteen tasapainotilaan. Häiriöt heikensivät ikivihreiden varpujen kasvullista palautumista häiriön jälkeen. Häiriö loi sopivia elinympäristöjä siementen itämiselle, mutta tutkittujen lajien siementen määrä rajoitti siemenellistä lisääntymistä. Typpilannoitus ei vaikuttanut mikrobibiomassaan, mutta häiriö vähensi mikrobibiomassaa boreaalisessa ekosysteemissä. Kuitenkin kasvien typen pitoisuudet lisääntyivät sekä lannoituksen että häiriön jälkeen ilman viitteitä typen sitoutumisesta mikrobibiomassaan. Tämä viittaa siihen, että kasvit käyttävät maaperän typen tehokkaasti häiriön jälkeiseen palautumiseen. Väitöskirjan mukaan typen lisääntyminen häiriöiden yhteydessä edistää heinien esiintymistä. Koska ikivihreiden varpujen siemenellinen lisääntyminen ei kompensoi häiriöstä kasvulliselle palautumiselle aiheutuvaa haittaa, ovat ikivihreät varvut erityisen herkkiä häiriöille. Aluskasvillisuus on vastustuskykyisempi ympäristön muutoksille boreaalisessa kuin subarktisessa ekosysteemissä, mikä korostaa pohjoisimpien alueiden herkkyyttä yhtäaikaisille ympäristön muutoksille. Maaperän olosuhteet ovat kasvillisuutta kestävämpiä ympäristön muutoksille
Huang, Jianjun. "Ecological responses of two forest understory herbs to changes in resources caused by prescribed fire alone on in combination with restoration thinning." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1195062013.
Full textStockton, Stephen A. "The effect of introduced Sitka black-tailed deer, Odocoileus hemionus sitkensis Merriam, on the forest understorey plant communities of Haida Gwaii, British Columbia: Pattern, process, and recovery." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/29172.
Full textOrihuela, Rodrigo Leonel Lozano. "Diversidade e abundância de hemiepífitos em um gradiente altitudinal na Floresta Atlântica no Sul do Brasil." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/26288.
Full textThe main aim of this study was to analyze the major abiotic and biotic factors correlated with distribution, abundance and richness of primary and secondary hemiepiphytes and root-climbing lianas along an altitudinal gradient of the South Brazilian Atlantic Forest. Fifteen 400-m² square sample plots within three altitudinal levels at the slope of Serra Geral in north-eastern Rio Grande do Sul were defined. Abundance of all species, the percentage of host trees colonized by each synusia, and explanatory variables canopy openness, soil composition and tree density with DBH ≥ 5 and ≥ 20 cm were recorded for each sample plot. Mean annual air temperature and rainfall were recorded for each altitudinal level. Climatic variables (precipitation and temperature) were the main explanatory variables related with the variation in abundance and richness in the three synusiae studied. The three life forms showed different intensities in their response to these variables. The abundance of secondary hemiepiphytes increased up to four times from the lower to upper altitudinal levels, while root-climbing lianas increased almost twice in the same direction, following an increase in precipitation and humidity. Total species richness decreased toward the upper level of the gradient correlated with lower temperatures and colder winter months. Our results corroborate previous studies on other taxonomic groups, which indicate that climatic variables are first-order predictors for species distribution and reinforce the importance to study different life forms, because these may respond in distinct ways to environment factors.
Irvin, N. A. "Understorey management for the enhancement of populations of a leafroller (Lepidoptera: Tortricidae) parasitoid (Dolichogenidea tasmanica (Cameron)) in Canterbury, New Zealand apple orchards." Lincoln University, 1999. http://hdl.handle.net/10182/1111.
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