Soil Carbon, Nitrogen and Microbial Dynamics of Pasturelands: Impacts of Grazing Intensity and Planting Systems

查看全文 作　　者：WANG [1,2]Yi;DUAN Wen-[2,3]Xia;[2]C.TU;[4]S.WASHBURN;CHENG [2]Lei;[2]S.HU

机构地区：[1]State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment, Chinese Academy of Sciences;[2]Department of Plant Pathology, North Carolina State University;[3]Sichuan Tourism University;[4]Department of Animal Science, North Carolina State University

出　　处：《Pedosphere》索引2014年第24卷第3期,共9页

基　　金：Supported by the USDA-NRI,USA(No.NRI-2007-03307);the USDA Southern Region SARE Program,USA(No.2012-02978);the China Scholarship Council(No.[2006]3085);the National Natural Science Foundation of China(No.41201259);the Natural Science Foundation of Shaanxi Province,China(No.2013JQ5001) 摘　　要：Management intensity critically influences the productivity and sustainability of pasture systems through modifying soil microbes, and soil carbon(C) and nutrient dynamics; however, such effects are not well understood yet in the southeastern USA. We examined the effects of grazing intensity and grass planting system on soil C and nitrogen(N) dynamics, and microbial biomass and respiration in a long-term field experiment in Goldsboro, North Carolina, USA. A split-plot experiment was initiated in 2003 on a highly sandy soil under treatments of two grass planting systems(ryegrass rotation with sorghum-sudangrass hybrid and ryegrass seeding into a perennial bermudagrass stand) at low and high grazing densities. After 4 years of continuous treatments, soil total C and N contents across the 0–30 cm soil profile were 24.7% and 17.5% higher at the high than at the low grazing intensity, likely through promoting plant productivity and C allocation belowground as well as fecal and urinary inputs. Grass planting system effects were significant only at the low grazing intensity, with soil C, N, and microbial biomass and respiration in the top 10 cm being higher under the ryegrass/bermudagrass than under the ryegrass/sorghum-sudangrass hybrid planting systems. These results suggest that effective management could mitigate potential adverse effects of high grazing intensities on soil properties and facilitate sustainability of pastureland. 关键词：放牧强度土壤微生物种植制度土壤碳牧场长期田间试验微生物生物量植物生产力

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Soil Carbon, Nitrogen and Microbial Dynamics of Pasturelands: Impacts of Grazing Intensity and Planting Systems

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