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Effects of land use and changes in cover on the transformation and transportation of iron:A case study of the Sanjiang Plain,Northeast China

引用

Science China Earth Sciences 2011年第5期54卷 686-693页

作者： PAN XiaoFeng YAN BaiXing Yoh MUNEOKI Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun 130012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Tokyo University of Agriculture and Technology Tokyo 1838509 Japan

Wetland reclamation has been ongoing in the Sanjiang Plain since the mid-1950s,which has resulted in major changes in wetlands and the agriculture ecosystem in the region that have influenced the iron output to the Sea of Okhotsk and limited the primary productivity in the North Pacific *** study was conducted to investigate the chemical forms of iron in different aquatic environments(agricultural water including groundwater,paddy water,and canal water;wetland water including marsh water,marsh streams,and main streams) with the cross-flow filtration method to reveal the transportation and transformation characteristics of iron in response to major land use *** addition,the factors affecting iron behavior in different water bodies were *** marsh water and streams,the concentrations of dissolved iron were higher due to the high organic matter contents and marsh water becoming the main iron source for river *** conversion of dissolved iron into acid-labile iron occurred during the discharge of wetland water into marsh *** primarily existed in both the >0.7 and water,and a fraction of this ferrous iron was subsequently converted into high molecular weight and medium molecular weight iron(colloid iron) in paddy and canal ***,the concentrations of total dissolved iron decreased by 62.5% from underground to the surface due to the formation of *** this,water discharge in agriculture is still an important iron source for rivers and has the potential to supplement iron due to its higher acid-labile iron *** use and cover change and agricultural irrigation increased the iron content of surface soil,but reduced the output of iron in water ***,the concentration of total dissolved iron in water systems has be

关键词： land use and cover change marsh water marsh river agricultural water iron species Sanjiang Plain

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