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《Chinese Journal of Ecology》 2011-11
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Distribution patterns of soil organic carbon and total nitrogen in Zoige peat land with different ground water table

LI Li1,2,GAO Jun-qin1,LEI Guang-chun1**,Lü Cai1,SUO Langduoerji3(1School of Nature Conservation,Beijing Forestry University,Beijing 100083,China;2State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;3Zoige National Nature Reserve,Zoige 624500,Sichuan,China)  
Taking the typical peat land in Zoige National Nature Reserve at the eastern edge of Qinghai-Tibet Plateau as test object,four sites with different ground water tables were selected in summer 2009 to study the distribution patterns of organic carbon and total nitrogen in soil profile(0-50 cm),aimed to understand the effects of underground water table fluctuation on peat land soil carbon and nitrogen.In the soil profiles,both the organic carbon and the total nitrogen decreased exponentially with decreasing ground water table,and the coefficient of variation presented an increasing trend,implying that the decrease of ground water table was the main cause of the losses of soil carbon and nitrogen.There was a significant positive correlation between soil organic carbon and soil total nitrogen,and the two of them were significantly negatively correlated with soil pH and soil bulk density.The soil C/N ratio at the four sites had a small variation(from 15.76 to 18.16),implying low decomposition rate of soil organic carbon under the plateau climate and little effects of ground water table and soil pH on the soil C/N ratio.
【Fund】: 国家林业局公益项目(200804005);; 国家基础研究规划项目(2009CB421103)资助
【CateGory Index】: S153.6
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