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Letteratura scientifica selezionata sul tema "Soil ecology"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 10 agosto 2024

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Articoli di riviste sul tema "Soil ecology"

Paoletti, Maurizio G. "Soil Ecology". Economic Botany 56, n. 4 (ottobre 2002): 419. http://dx.doi.org/10.1663/0013-0001(2002)056[0419:se]2.0.co;2.

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Fuentes, J. P. "Soil Ecology." Vadose Zone Journal 2, n. 2 (1 maggio 2003): 277–78. http://dx.doi.org/10.2113/2.2.277.

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Zasoski, Robert J. "Soil Ecology". Journal of Environmental Quality 25, n. 2 (marzo 1996): 374–75. http://dx.doi.org/10.2134/jeq1996.00472425002500020025x.

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Seastedt, Tim. "Soil Ecology". Journal of Environmental Quality 25, n. 3 (maggio 1996): 629–30. http://dx.doi.org/10.2134/jeq1996.00472425002500030036x.

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Ball, D. F., e K. Kilham. "Soil Ecology." Journal of Ecology 83, n. 1 (febbraio 1995): 170. http://dx.doi.org/10.2307/2261165.

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Heneghan, Liam. "Soil Ecology". Ecology 79, n. 1 (gennaio 1998): 351–52. http://dx.doi.org/10.1890/0012-9658(1998)079[0351:se]2.0.co;2.

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Fuentes, Juan-Pablo. "Soil Ecology." Vadose Zone Journal 2, n. 2 (2003): 277. http://dx.doi.org/10.2136/vzj2003.0277.

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Fuentes, Juan-Pablo. "Soil Ecology." Vadose Zone Journal 2, n. 2 (maggio 2003): 277–78. http://dx.doi.org/10.2136/vzj2003.2770.

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Edwards, Clive A. "Soil Ecology". Applied Soil Ecology 20, n. 3 (giugno 2002): 263. http://dx.doi.org/10.1016/s0929-1393(02)00043-4.

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Edwards, Clive A. "Soil Ecology". Applied Soil Ecology 21, n. 1 (luglio 2002): 89. http://dx.doi.org/10.1016/s0929-1393(02)00047-1.

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Tesi sul tema "Soil ecology"

Wagai, Rota. "Climatic and Lithogenic Controls on Soil Organic Matter-Mineral Associations". Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/WagaiR2005.pdf.

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Williamson, Kurt Elliott. "Ecological aspects of viruses in soils". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 174 p, 2007. http://proquest.umi.com/pqdweb?did=1253509761&sid=1&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Thesis (Ph.D.)--University of Delaware, 2006.
Principal faculty advisors: Karl E. Wommack, Dept. of Plant & Soil Sciences, University of Delaware; Mark Radosevich, Dept. of Biosystems Engineering and Soil Science, University of Tennessee. Includes bibliographical references.

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Meadow, James Francis. "Geothermal soil ecology in Yellowstone National Park". Diss., Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/meadow/MeadowJ0512.pdf.

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Microbial communities in soil are among the most diverse and species-rich of any habitat, but we know surprisingly little about the factors that structure them. Geothermal soils present unique and relatively unexplored model systems in which to address ecological questions using soil microbial communities, since harsh conditions in these soils exert strong filters on most organisms. This work represents two very different approaches to studying soil ecology in geothermal soils in Yellowstone National Park: 1) Arbuscular mycorrhizal fungal (AMF) communities living in the roots of Mimulus gutattus in contrasting plant community types were compared to assess a link in community structure between plants and their AMF symbionts; and 2) soil microbial communities were surveyed across multiple spatial scales in an unstudied diatomaceous biological soil crust in alkaline siliceous geothermal soils, using bar-coded 454 pyrosequencing of 18S and 16S rDNA. Mycorrhizal communities living in plant roots from contrasting community types showed a striking difference in taxon richness and diversity that appears to transcend soil-chemical differences, though robust conclusions are difficult since plant and fungal communities are structured by some of the same confounding soil conditions. Cluster and discriminant analyses were employed to compare drivers of AMF community structure. Eukaryotic and prokaryotic communities in a diatomaceous biological soil crust differ significantly from that of an adjacent sinter soil, and along a photic depth gradient. Along with a description of this unique system, extensive multivariate community analyses were used to address outstanding questions of soil microbial community spatial heterogeneity and the methodologies best suited to the unique assumptions of these datasets. Depending on the intended scope of inference, much detail can be gained by investigation of microbial communities at the aggregate or soil particle scale, rather than through composite sampling. Additionally, beta-diversity patterns are apparent with relatively few sequences per sample. 'Co-authored by Catherine A. Zabinski.'

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Travis, Emma Rachel. "Microbial ecology of soil contaminated with trinitrotoluene". Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613973.

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Gentry, Terry Joe. "Molecular ecology of chlorobenzoate degraders in soil". Diss., The University of Arizona, 2003. http://hdl.handle.net/10150/289936.

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A series of three experiments were conducted to determine the diversity of indigenous chlorobenzoate (CB) degraders in soil and to investigate the use of different methods of bioaugmentation for remediation of contaminated soil. In the first study, soil was amended with either 500 or 1000 μg of 3-CB g⁻¹ and was either uninoculated or inoculated with the 3-CB degrader Comamonas testosteroni BR60. Bioaugmentation with C. testosteroni BR60 increased 3-CB degradation at both contaminant levels, and the increase was more pronounced at the higher level due to contaminant inhibition of indigenous 3-CB degraders. Bioaugmentation also appeared to reduce the deleterious effects that 3-CB contamination had on indigenous soil microbial populations as evidenced by changes in culturable heterotrophic bacterial populations. In the second study, two similar pristine soils were contaminated with 500 μg of 2-, 3-, or 4-CB g⁻¹ . The two soils differed in their ability to degrade the compounds with one degrading 2- and 4-CB and the other degrading 3- and 4-CB. Several hundred degraders were isolated, grouped according to DNA fingerprints, and selected degraders were identified by 16S rDNA sequences. The identity of the CB degraders differed between the two soils. The results indicated that the development of 2-, 3-, and 4-CB degrader populations was site-specific even for the soils that developed under similar soil-forming conditions. The third study also used the two soils from the second study. This project investigated the potential for use of activated soil, which contained an indigenous degrader population, as a bioaugmentation inoculant. An aliquot of a given soil that contained an indigenous 2-, 3-, or 4-CB degrader population was added to a soil that did not have an indigenous degrader population for the same contaminant. The study found that bioaugmentation with activated soil increased degradation of each 2-, 3-, and 4-CB but only if the activated soil was pre-exposed to the contaminant prior to use for bioaugmentation. The results from these three studies indicate that CB degrader populations are diverse and variable in pristine soils and, if not present in contaminated soils, appropriate degrader populations may be established via different bioaugmentation strategies.

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Ilstedt, Ulrik. "Soil degradation and rehabilitation in humid tropical forests (Sabah, Malaysia) /". Umeå : Swedish University of Agricultural Sciences, 2002. http://diss-epsilon.slu.se/archive/00000233/.

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Thesis (doctoral)--Swedish University of Agricultural Sciences, 2002.
Abstract inserted. Appendix reprints four papers and manuscripts co-authored with others. Includes bibliographical references. Also partially issued electronically via World Wide Web in PDF format; online version lacks appendix.

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Marí, Marí Teresa. "Changes in soil biodiversity and activity along management and climatic gradients". Doctoral thesis, Universitat de Lleida, 2017. http://hdl.handle.net/10803/457976.

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Els anomenats “rangelands” són àrees sense cultivar, àmpliament pasturades per animals domèstics i salvatges, actualment amenaçats pels canvis climàtic i en l’ús del sòl. Els microorganismes del sòl tenen un paper clau tant en la descomposició com en diversos processos de l’ecosistema, fet pel qual composició i funció de la comunitat microbiana han estat utilitzats durant molt temps com a índexs de fertilitat del sòl. Els rangelands europeus i africans comparteixen un origen antropogènic comú, però el clima i la gestió del sòl els afecten d’una manera diferent. És per això que aquesta tesi pretén analitzar la comunitat microbiana d’ambdós tipus d’ecosistemes, per tal d’observar els efectes d’algunes de les amenaces comunes des d’una perspectiva més global. Mentre que la sobrepastura va demostrar tenir l’efecte més perjudicial sobre la funció microbiana en sòls kenyans, es va trobar un efecte més fort del clima sobre els prats europeus. Els fongs i els bacteris van covariar al llarg de gradients altitudinals i climàtics, però la comunitat bacteriana va mostrar una recuperació més ràpida després de les pertorbacions biològiques i físico-químiques del sòl. Aquest conjunt d’estudis afegeix nous coneixements sobre l’estructura i funció dels rangelands africans i europeus, i convida a explorar noves línies de recerca que incloguin tant bacteris com fongs alhora d’estudiar la comunitat microbiana del sòl.
Los llamados "rangelands" son áreas sin cultivar, ampliamente pastoreadas por animales domésticos y salvajes, actualmente amenazados por los cambios climático y de uso del suelo. Los microorganismos del suelo tienen un papel clave tanto en la descomposición como en diversos procesos del ecosistema, por lo que composición y función de la comunidad microbiana han sido utilizados durante mucho tiempo como índices de fertilidad del suelo. Los rangelands europeos y africanos comparten un origen antropogénico común, pero el clima y la gestión del suelo les afectan de una manera diferente. Es por ello que esta tesis pretende analizar la comunidad microbiana de ambos tipos de ecosistemas, a fin de observar los efectos de algunas de las amenazas comunes desde una perspectiva más global. Mientras que el sobrepastoreo demostró tener el efecto más perjudicial sobre la función microbiana en suelos kenianos, se encontró un efecto más fuerte del clima sobre los prados europeos. Los hongos y las bacterias covariaron a lo largo de gradientes altitudinales y climáticos, pero la comunidad bacteriana mostró una recuperación más rápida después de las perturbaciones biológicas y físico-químicas del suelo. Este conjunto de estudios añade nuevos conocimientos sobre la estructura y función de los rangelands africanos y europeos, e invita a explorar nuevas líneas de investigación que incluyan tanto bacterias como hongos en el estudio de la comunidad microbiana del suelo.
Rangelands are uncultivated areas extensively grazed by wild and domestic animals, currently threatened by land use and climatic changes. Soil microorganisms play a key role in decomposition and several ecosystem processes and the composition and function of the microbial community have been long used as indices of soil fertility. African and European rangelands share a common anthropogenic origin, but climate and management affect them in a different way. That is why this thesis aimed to analyze the microbial community of both in order to observe the effects of some common threats from a more global perspective. While overgrazing proved to have the most detrimental effect on the soil microbial function in Kenyan soils, a stronger effect of climate was found to affect European grasslands. Fungi and bacteria co-varied along altitudinal and climatic gradients, but the bacterial community showed a fast recovery after biological and soil physico-chemical disturbances. This group of studies adds new knowledge on the structure and function of the African and European rangelands, and invite to explore new lines of research including both fungal and bacterial consortia when studying the soil microbial community.

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Coyle, Kieran. "An investigation of the role of soil micro-organisms in phosphorus mobilisation : a report submitted to fulfil the requrements of the degree of Doctor of Philosophy". Title page, table of contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phc8814.pdf.

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O'Flaherty, S. M. "Microbial diversity in contaminated soil". Thesis, Cranfield University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274042.

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Wepking, Carl. "Soil microbial function in a time of global change: effect of dairy antibiotics on soil microbial communities and ecosystem function". Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/85125.

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Antibiotic resistance is ubiquitous due to high usage of antibiotics and the capability of bacteria to transfer genes both horizontally and vertically. While this has dire implications for human health, the potential to disturb microbial communities and ecosystem functions they regulate is under appreciated. Antibiotics are commonly used in the livestock sector, accounting for 80% of antibiotic use domestically. This dissertation addresses three facets of this problem. Chapter 2 is a nation-wide survey of antibiotic resistance at dairy operations, aimed at understanding how ecosystem function is affected in situ. Chapter 3 describes a field-experiment, seeking to determine whether antibiotics have effects beyond soil through impacts on plant-microbe-soil feedbacks, thus potentially altering terrestrial ecosystem function. Chapter 4 investigates how rising global temperature interacts with antibiotic exposure through a microcosm-incubation experiment. These multiple stressors (i.e. temperature and antibiotics) could alter microbial community composition or physiology with repercussions on function. Additionally, chapter 4 seeks to determine whether microbes acclimate to continued antibiotic exposure. In chapter 2 I present evidence that increased antibiotic resistant gene (ARG) abundance with exposure to antibiotics and manure, and a correlation between ARGs and microbial stress. This increase in microbial stress results in elevated soil carbon loss. Chapter 3 shows that antibiotic exposure can change plant function – presumably through impacts on rhizospheric microbial community composition. Plants assimilate more nitrogen, but more carbon is lost from the system overall seemingly due to plant-soil-microbe tradeoffs. Chapter 4 shows a temporally dependent temperature–antibiotic interactive effect. Initially, pirlimycin increased microbial respiration at high temperatures, however this diminishes with time. Additional studies of microbial respiration at a range of temperatures show that microbial acclimation to antibiotic exposure may be taking place. However, interactive effects of high temperature and antibiotics appear to inhibit active microbial biomass production. Possible explanations to both of these patterns are the underlying differences in microbial community composition, specifically the fungal:bacterial. My results show that antibiotics not only lead to increased ARG abundance, but also have wide ranging effects on communities and ecosystem processes that are likely to be compounded in the face of global change.
Ph. D.

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Libri sul tema "Soil ecology"

Lavelle, Patrick, e Alister V. Spain. Soil Ecology. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-017-5279-4.

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Lavelle, P. Soil ecology. Dordrecht: Kluwer Academic Publishers, 2001.

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Cruz, Cristina, Kanchan Vishwakarma, Devendra Kumar Choudhary e Ajit Varma, a cura di. Soil Nitrogen Ecology. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71206-8.

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Luis, Sampedro, a cura di. Soil ecology and management. Cambridge, MA: CABI, 2009.

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Gershuny, Grace. The soul of soil: A guide to ecological soil management. 3^a ed. Davis, Calif: agAccess, 1995.

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Whalen, J. K., e L. Sampedro, a cura di. Soil ecology and management. Wallingford: CABI, 2009. http://dx.doi.org/10.1079/9781845935634.0000.

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Tian-Xiao, Liu, a cura di. Soil ecology research developments. New York: Nova Science Publishers, 2008.

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Liu, Tian-Xiao. Soil ecology research developments. New York: Nova Science Publishers, 2008.

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A, Crossley D., a cura di. Fundamentals of soil ecology. San Diego: Academic Press, 1996.

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González, Juan Antonio. Valle del Cibao: Ecología, suelos y degradación. 2^a ed. Santo Domingo, República Dominicana: Editora Manatí, 2003.

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Capitoli di libri sul tema "Soil ecology"

Huntley, Brian John. "Soil, Water and Nutrients". In Ecology of Angola, 127–47. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18923-4_6.

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AbstractThis Chapter provides an introduction to basic elements of soil science, from an understanding of the soil profile, its develop and its importance to plant growth. The processes of weathering and the development of laterites, calcretes, salinised and other major soil types and their distribution in Angola are described. Soil water relations and soil chemistry and thus the availability of water and nutrients are fundamental determinants of plant growth, species composition and productivity. The differences between dystrophic (low base status) and eutrophic (high base status) soils and the distribution of the mesic/dystrophic savanna biome and the arid/eutrophic savanna biome, which dominate Angolan landscapes (totaling over 90% of the vegetation mantle of the country) are emphasised. The Key Soil Groups of Angola are mapped and their characteristics summarised. Sandy arenosols cover 53% of Angola, mainly comprising the Kalahari sands of the eastern half of Angola. Ferralsols cover 23% of Angola, occupying the spine of crystalline rocks along the western highlands. Both are of low nutrient status but carry dense miombo woodlands where they have not been transformed by human activities. Richer soils occur along the escarpment and hot coastal lowlands. The processes of land degradation, due to inappropriate soil management threaten the livelihoods of communities living on these fragile soils, are described.

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Lavelle, Patrick, e Alister V. Spain. "Soil Formation". In Soil Ecology, 143–200. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-017-5279-4_2.

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Lavelle, Patrick, e Alister V. Spain. "Soil Organisms". In Soil Ecology, 201–356. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-017-5279-4_3.

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Lavelle, Patrick, e Alister V. Spain. "Internal Environment, Microclimate and Resources". In Soil Ecology, 1–142. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-017-5279-4_1.

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Lavelle, Patrick, e Alister V. Spain. "Functioning of the Soil System". In Soil Ecology, 357–529. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-017-5279-4_4.

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Wigginton, Sara, e Jose A. Amador. "Soil: Microbial Ecology". In Landscape and Land Capacity, 307–14. Second edition. | Boca Raton: CRC Press, [2020] | Revised edition of: Encyclopedia of natural resources. [2014].: CRC Press, 2020. http://dx.doi.org/10.1201/9780429445552-39.

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Fenner, Michael. "Soil seed banks". In Seed Ecology, 57–71. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4844-0_4.

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Sultanpuram, Vishnuvardhan Reddy, e Thirumala Mothe. "Microbial Ecology of Saline Ecosystems". In Soil Biology, 39–63. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-18975-4_3.

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Nagrale, Dipak T., e Shailesh P. Gawande. "Archaea: Ecology, Application, and Conservation". In Soil Biology, 431–51. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-96971-8_16.

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Schulze, Ernst-Detlef, Erwin Beck, Nina Buchmann, Stephan Clemens, Klaus Müller-Hohenstein e Michael Scherer-Lorenzen. "Adverse Soil Mineral Availability". In Plant Ecology, 203–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-56233-8_7.

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Atti di convegni sul tema "Soil ecology"

Rusakova, Elena A. "The soil parade to draw attention to soils and ecology". In The libraries and ecological education: Theory and practice. Russian National Public Library for Science and Technology, 2020. http://dx.doi.org/10.33186/978-5-85638-227-2-2020-253-256.

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Menshov, O. "Theory And Methodology Of Soil Magnetism In Geology, Ecology, And Soil Science". In 12th International Conference on Monitoring of Geological Processes and Ecological Condition of the Environment. Netherlands: EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201803174.

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Hu, Hua, e Zhirong Lin. "Experimental Study on the Influence of Permeability Coefficient of Granite Residual Soil". In International Symposium on Water, Ecology and Environment. SCITEPRESS - Science and Technology Publications, 2022. http://dx.doi.org/10.5220/0011953000003536.

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Liakh, A. V., A. O. Golovina e A. V. Pitriuk. "ECOLOGICAL AND TOXICOLOGICAL ASSESSMENT OF SOIL CONDITIONS: ANALYSIS OF SPECIFIC TOPICAL ISSUES". In STATE AND DEVELOPMENT PROSPECTS OF AGRIBUSINESS. DSTU-PRINT, 2020. http://dx.doi.org/10.23947/interagro.2020.1.696-699.

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Due to the active development of industry and agricultural activities, more and more territories of the Russian Federation are subject to contamination by pesticides and heavy metals. In this article, special attention is paid to the ecological and Toxicological characteristics of the soils of two regions: the Moscow region, whose soils are significantly contaminated with heavy metals as a result of the activities of industrial facilities, and the Krasnodar region with a high agricultural load, which have been studied for contamination with pesticides. We analyzed not only physical and chemical changes in the soil cover, but also the consequences that negatively affect ecosystems. The prospects of using zoning as a management method in ecology are considered.

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Kozlenko, A. V. "PROBLEMS OF ECOLOGY OF ANCIENT GREECE". In SAKHAROV READINGS 2021: ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute, 2021. http://dx.doi.org/10.46646/sakh-2021-1-11-14.

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The article deals with the problems of ecology of ancient Greece. Based on the data of written sources, as well as the results of paleoclimatic studies, the author comes to the conclusion that the climate in Greece of the classical era was minimally different from the modern one, but the ecological situation was somewhat different. With a large population and developed agriculture, signs of decline gradually began to appear, which included increasing soil erosion, especially on the lower slopes of the hills, as well as waterlogging of low-lying land areas. These processes were aggravated by the uncontrolled development of small-scale cattle breeding and the thoughtless destruction of woody vegetation. In the end, these processes brought the country to the brink of an ecological catastrophe and served as one of the reasons for the decline of ancient civilization.

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Bouchal, Tomas. "THE USE OF WASTE MATERIALS FOR RECLAMATION PRODUCITON AND SOIL BACKFILL". In 13th SGEM GeoConference on ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION. Stef92 Technology, 2013. http://dx.doi.org/10.5593/sgem2013/be5.v1/s20.141.

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Kovacova, Viera. "INFLUENCE OF GROUNDWATER COMPOSITION ON IONS CONTENT IN THE SOIL PROFILE". In 14th SGEM GeoConference on ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION. Stef92 Technology, 2014. http://dx.doi.org/10.5593/sgem2014/b52/s20.049.

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Bryukhov, Mikhail. "MODERN EXPERIENCE OF NATURAL CLAY USE AT RECLAMATION OF DISTURBED SOIL". In 14th SGEM GeoConference on ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION. Stef92 Technology, 2014. http://dx.doi.org/10.5593/sgem2014/b51/s20.062.

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Sergazina, Meruert. "ECOLOGY MONITORING OF SOIL CONTAMINATED WITH PETROLEUM BY MODERN TECHNIQUES OF ANALYSIS". In 15th International Multidisciplinary Scientific GeoConference SGEM2015. Stef92 Technology, 2011. http://dx.doi.org/10.5593/sgem2015/b52/s20.021.

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Markin, V. N., I. V. Glazunova, S. A. Sokolova e N. I. Matveeva. "Aspects of soil zoning by crop irrigation necessity". In INTERNATIONAL SCIENTIFIC AND PRACTICAL CONFERENCE “TECHNOLOGY IN AGRICULTURE, ENERGY AND ECOLOGY” (TAEE2022). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0128245.

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Rapporti di organizzazioni sul tema "Soil ecology"

Cragin, Melissa, e Marina Kogan. Soil Ecology - University of Illinois Urbana-Champaign. Purdue University Libraries, settembre 2010. http://dx.doi.org/10.5703/1288284315014.

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Masyutenko, N. P. Topical problems of soil science, ecology and agriculture. DOI CODE, 2023. http://dx.doi.org/10.18411/doicode-2023.253.

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Hungate, Bruce. Final Report: Scaling the Microbial Ecology of Soil Carbon, SC0016207. Office of Scientific and Technical Information (OSTI), maggio 2022. http://dx.doi.org/10.2172/1869394.

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Fritz, Brad G., Ted M. Poston e Roger L. Dirkes. Fitzner/Eberhardt Arid Lands Ecology (ALE) Reserve Soil Sampling and Analysis Plan. Office of Scientific and Technical Information (OSTI), maggio 2004. http://dx.doi.org/10.2172/15007501.

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Huggins, T. R., B. A. Prigge, M. R. Sharifi e P. W. Rundel. Community Dynamics and Soil Seed Bank Ecology of Lane Mountain Milkvetch (Astragalus jaegerianus Munz). Fort Belvoir, VA: Defense Technical Information Center, agosto 2012. http://dx.doi.org/10.21236/ada582562.

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Minz, Dror, Eric Nelson e Yitzhak Hadar. Ecology of seed-colonizing microbial communities: influence of soil and plant factors and implications for rhizosphere microbiology. United States Department of Agriculture, luglio 2008. http://dx.doi.org/10.32747/2008.7587728.bard.

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Original objectives: Our initial project objectives were to 1) Determine and compare the composition of seed-colonizing microbial communities on seeds, 2) Determine the dynamics of development of microbial communities on seeds, and 3) Determine and compare the composition of seed-colonizing microbial communities with the composition of those in the soil and rhizosphere of the plants. Revisions to objectives: Our initial work on this project was hampered by the presence of native Pythium species in the soils we were using (in the US), preventing us from getting accurate assessments of spermosphere microbial communities. In our initial work, we tried to get around this problem by focusing on water potentials that might reduce damage from native Pythium species. This also prompted some initial investigation of the oomycete communities associated seedlings in this soil. However, for this work to proceed in a way that would allow us to examine seed-colonizing communities on healthy plants, we needed to either physically treat soils or amend soils with composts to suppress damage from Pythium. In the end, we followed the compost amendment line of investigation, which took us away from our initial objectives, but led to interesting work focusing on seed-associated microbial communities and their functional significance to seed-infecting pathogens. Work done in Israel was using suppressive compost amended potting mix throughout the study and did not have such problems. Our work focused on the following objectives: 1) to determine whether different plant species support a microbial induced suppression of Pythium damping-off, 2) to determine whether compost microbes that colonize seeds during early stages of seed germination can adequately explain levels of damping-off suppression observed, 3) to characterize cucumber seed-colonizing microbial communities that give rise to the disease suppressive properties, 4) assess carbon competition between seed-colonizing microbes and Pythium sporangia as a means of explaining Pythium damping-off suppression. Background: Earlier work demonstrated that seed-colonizing microbes might explain Pythium suppression. Yet these seed-colonizing microbial communities have never been characterized and their functional significance to Pythium damping-off suppression is not known. Our work set out to confirm the disease suppressive properties of seed-colonizing microbes, to characterize communities, and begin to determine the mechanisms by which Pythium suppression occurs. Major Conclusions: Compost-induced suppression of Pythium damping-off of cucumber and wheat can be explained by the bacterial consortia colonizing seeds within 8 h of sowing. Suppression on pea was highly variable. Fungi and archaea play no role in disease suppression. Potentially significant bacterial taxa are those with affinities to Firmicutes, Actinobacteria, and Bacteroidetes. Current sequencing efforts are trying to resolve these taxa. Seed colonizing bacteria suppress Pythium by carbon competition, allowing sporangium germination by preventing the development of germ tubes. Presence of Pythium had a strong effect on microbial community on the seed.

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Crowley, David, Yitzhak Hadar e Yona Chen. Rhizosphere Ecology of Plant-Beneficial Microorganisms. United States Department of Agriculture, febbraio 2000. http://dx.doi.org/10.32747/2000.7695843.bard.

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Rhizoferrin, a siderophore produced by Rhizopus arrhizus, has been shown in previous studies to be an outstanding Fe carrier to plants. However, calculations based on stability constants and thermodynamic equilibrium lead to contradicting conclusions. In this study a kinetic approach was employed to elucidate this apparent contradiction and to determine the behavior of rhizoferrin under conditions representing soil and nutrient solutions. Stability of Fe3+ complexes in nutrient solution, rate of metal exchange with Ca, and rate of Fe extraction by the free ligand were monitored for rhizoferrin and other chelating agents by 55Fe labeling. Ferric complexes of rhizoferrin, desferri-ferrioxamine-B (DFOB), and ethylenediamine-di(o-hydroxyphenylacetic acid) (EDDHA) were found to be stable in nutrient solution at pH 7.5 for 31 days, while ferric complexes of ethylenediaminetetraacetic acid (EDTA) and mugineic acid (MA) lost 50% of the chelated Fe within 2 days. Fe-Ca exchange in Ca solutions at pH 8.7 revealed rhizoferrin to hold Fe at non-equilibrium state for 3-4 weeks at 3.3 mM Ca and for longer periods at lower Ca concentrations. EDTA lost the ferric ion at a faster rate under the same conditions. Fe extraction from freshly prepared Fe-hydroxide at pH 8.7 and with 3.2 mM Ca was slow and followed the order. DFOB > EDDHA > MA > rhizoferrin > EDTA. Based on these results we suggest that a kinetic rather than equilibrium approach should be the basis for predictions of Fe-chelates efficiency. We conclude that the non-equilibrium state of rhizoferrin is of crucial importance for its behavior as a Fe carrier to plants.

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Прилипко, Вікторія Вікторівна, e Вікторія Вікторівна Перерва. Флористична структура рослинного покриву проммайданчику Інгулецького гірничо-збагачувального комбінату. Львів, 2006. http://dx.doi.org/10.31812/123456789/4239.

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Ecological, biomorfical, ecology-coenotic and geographical structure of the plant groups of the industrial areas were studied taking the example of Inguletskiy OreDressing Combine. It was found out that changes of participation of ecological groups in relation to environment of life are caused by features edaphical conditions. Infringements of a vegetation and soil cause formation of groups with specific specter of biomorfs. The basic role in a vegetation of the industrial areas has of species of the ruderal coenoelement of the synantropic floroсоеnotyp.

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Прилипко, Вікторія Вікторівна, e Вікторія Вікторівна Перерва. Флористична структура рослинного покриву проммайданчику Інгулецького гірничо-збагачувального комбінату. Ін-т екології Карпат НАН України, 2006. http://dx.doi.org/10.31812/123456789/4235.

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Brzostek, Edward, Ember Morrissey e Zachary Freedman. Final Technical Report: Quantitative, trait-based microbial ecology to accurately model the impacts of nitrogen deposition on soil carbon cycling in the Anthropocene. Office of Scientific and Technical Information (OSTI), novembre 2023. http://dx.doi.org/10.2172/2221797.

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