Long-term consequences of biochemical and biogeochemical changes in the Horseshoe Bend agroecosystem,Athens, GA |
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| Institution: | 1. Department of Environmental Chemistry, University of Kassel, Nordbahnhofstr. 1a, 37213 Witzenhausen, Germany;2. Soil Science and Soil Ecology, Ruhr-Universität Bochum, Universitätsstr. 150, 44801 Bochum, Germany;3. Department of Soil Biology and Plant Nutrition, University of Kassel, Nordbahnhofstr. 1a, 37213 Witzenhausen, Germany;4. Geoinformatics and Remote Sensing, Institute for Geography, University of Leipzig, Johannisallee 19a, 04103 Leipzig, Germany;1. Department of Environmental Chemistry, University of Kassel, Nordbahnhof str. 1a, Witzenhausen 37213 (Germany);2. Department of Soil Science and Agricultural Chemistry, University of Agricultural Sciences (GKVK), Bangalore 560065 (India);3. Organic Plant Production and Agroecosystems Research in the Tropics and Subtropics, University of Kassel, Stein str. 19, Witzenhausen 37213 (Germany);4. Department of Agricultural Microbiology, University of Agricultural Sciences (GKVK), Bangalore 560065 (India);1. Dr YSP UHF-COHF, Department of Horticulture, Neri, Hamirpur, Himachal Pradesh, India;2. Dr YSP UHF-Regional Horticultural Research & Training Station, Dhaulakuan, Sirmour, Himachal Pradesh, India;3. Dr YSP UHF-Department of Environmental Sciences, Nauni, Solan, 173 230 Himachal Pradesh, India;4. Dr YSP UHF-Department of Basic Sciences, Nauni, Solan, 173 230 Himachal Pradesh, India;1. Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China;2. Tianjin Institute of Agricultural Resources and Environment, Tianjin 300192, P.R.China;1. Department of Forestry and Environmental Resources, Box 8008, North Carolina State University, Raleigh, NC 27695, USA;2. Bordeaux Sciences Agro UMR INRA-TCEM 1220, University of Bordeaux, 33883 Villenave d’Ornon, France;3. USDA-Forest Service, Southern Research Station, Research Triangle Park, NC 27709, USA;4. Weyerhaeuser NR Company, 1785 Weyerhaeuser Rd, Vanceboro, NC 28586, USA |
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| Abstract: | Understanding many soil processes, including the accumulation of organic matter and the formation and loss of soil aggregates, requires research that is conducted over decadal time periods. The dynamics of soil organic matter and soil fauna at the Horseshoe Bend (HSB) agroecosystem site in Georgia have been studied in replicated experimental plots since 1978. The experimental treatments (no-tillage (NT) and conventional-tillage (CT) regimes) are continuing to diverge in amounts and distribution of SOM in the soil profiles of HSB. Our current research focuses on two major areas: 1) long-term measurements of the gradually-increasing base of soil organic matter from C3-pathway plants, in crop rotations that have been in effect since 1997; 2) following the production, accumulation, fate and ecological effects of the Bt (Bacillus thuringiensis) proteins from the summer planting of Bt (and non-Bt) cotton in subplots within our main plots. The variation in the size of soil aggregates may influence the sequestration of Bt toxins, and their breakdown products, within soils. NT management systems at HSB generate an increasing proportion of soil macroaggregates in comparison to the markedly reduced macroaggregates in our CT plots. We suggest that NT systems may sequester more Bt-related products than will CT plots. |
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