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《Scientia Geographica Sinica》 2013-03
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Distribution of Soil Organic Carbon of Wetlands in the Middle Reaches of the Heihe River and Its Influencing Factors

ZHAO Rui-feng 1,ZHANG Li-hua 2,ZHAO Hai-li 1,JIANG Peng-hui 1,WANG Jian-zhen 1(1.College of Geography and Environment Science,Northwest Normal University,Lanzhou,Gansu 730070,China;2.Gaolan Experiment Station for Ecology and Agriculture Research,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou,Gansu 730000,China)  
Wetland ecosystem plays an important role in global carbon budget.However,the soil organic carbon(SOC) storage of wetland has been studied poorly in arid region.The distribution of SOC and its influence factors at three types of wetland vegetation(high herb vegetation,lower herb vegetation and woody vegetation) were analyzed in the middle reaches of the Heihe River.The results showed that the SOC contents at 0-10 cm,10-20 cm and 20-40 cm depths were in the order of high herb wetland vegetation lower herb wetland vegetation woody wetland vegetation.The differences in organic carbon content among the three types of wetland vegetation were significant at 0-10 cm and 10-20 cm depths of soil.The coefficient of variation of SOC was greatest in the lower herb wetland vegetation,and was least in the high herb wetland vegetation and secondary in the woody wetland vegetation.There was significant difference in SOC content between 0-10 cm and 20-40 cm depths of soil in the high herb wetland vegetation,difference was not significant in other two vegetation types.In accord with the distribution of SOC content,the soil carbon density in 0-40 cm depth was 7.33 kg/m2,5.44 kg/m2and 4.25 kg/m2 at high herb wetland vegetation,lower herb wetland vegetation and woody wetland vegetation,respectively.At high herb wetland vegetation and lower herb wetland vegetation,the SOC content decreased with soil depth and was more concentrated in the surface layer(0-10 cm) accounting for 32% and 31% of the total in 0-40 cm depth.While organic carbon content at the woody wetland vegetation was larger at the soil depth of 10-20 cm(accounting for 33% of the total in 0-40 cm depth).The SOC content was positively correlated with soil water content(p0.01) and phosphorus(p0.05),and negatively correlated with soil bulk density(p 0.01) and pH(p0.05).Moreover,SOC content in wetland vegetation had no obvious relationships with soil salinity and altitude.The difference in organic carbon among different soil types was not significant.
【Fund】: 国家自然科学基金项目(41261047 41201196);; 教育部博士点基金项目(20106203120004);; 西北师范大学青年教师科研能力提升计划骨干项目(NWNU-LKQN-11-11)资助
【CateGory Index】: S153.6
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