Land use effects on soil organic carbon, nitrogen and salinity in saline-alkaline wetland |
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| Authors: | WenJie Liu YongZhong Su Rong Yang XueFeng Wang and Xiao Yang |
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| Institution: | Linze Inland River Basin Research Station & Heihe Key Laboratory of Ecohydrology and Integrated River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;Linze Inland River Basin Research Station & Heihe Key Laboratory of Ecohydrology and Integrated River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;Linze Inland River Basin Research Station & Heihe Key Laboratory of Ecohydrology and Integrated River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;Linze Inland River Basin Research Station & Heihe Key Laboratory of Ecohydrology and Integrated River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;Linze Inland River Basin Research Station & Heihe Key Laboratory of Ecohydrology and Integrated River Basin Science, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China |
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| Abstract: | Land-use and soil management affects soil organic carbon (SOC) pools, nitrogen, salinity and the depth distribution. The objective of this study was to estimate land-use effects on the distribution of SOC, labile fractions C, nitrogen (N) and salinity in saline-alkaline wetlands in the middle reaches of the Heihe River Basin. Three land-use types were selected: intact saline-alkaline meadow wetland, artificial shrubbery (planting Tamarix) and farmland (cultivated for 18 years) of soils previously under meadow wetland. SOC, easily oxidized carbon, microbial biomass carbon, total N, NO3--N and salinity concentrations were measured. The results show that SOC and labile fraction carbon contents decreased significantly with increasing soil depth in the three land-use wetlands. The labile fraction carbon contents in the topsoil (0-20cm) in cultivated soils were significantly higher than that in intact meadow wetland and artificial shrubbery soil. The aboveground biomass and soil permeability were the primary influencing factors on the contents of SOC and the labile carbon in the intact meadow wetland and artificial shrubbery soil, however, the farming practice was a factor in cultivated soil. Agricultural measures can effectively reduce the salinity contents; however, it caused a significant increase of NO 3--N concentrations which posed a threat to groundwater quality in the study area. |
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| Keywords: | labile fraction carbon easily oxidized carbon microbial biomass carbon salinity nitrate-nitrogen saline-alkaline wetland |
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