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《Environmental Science》 2008-03
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Characteristics of the Wetland Soil Iron Under Different Ages of Reclamation

ZOU Yuan-chun~(1,2),L Xian-guo~1,JIANG Ming~1(1.Key Laboratory of Wetland Ecology and Environment,Northeast Institute of Geography and Agricultural Ecology,Chinese Academy of Sciences,Changchun 130012,China;2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China)  
The temporal-spatial trends of soil total iron concentration(Fet),free degree(Fed/Fet),activation degree(Feo/Fed) and complex degree(Fep/Fed) of soil iron oxides after reclamation were studied in Sanjiang Plain Wetlands.The result suggests that Fet in the upper tillage layers(0~20 cm) are influenced by reclamation more significantly than that in the lower ones(20~100 cm),and so does the early ages(0~1 years) than the late ages(1~25 years).Fet is negatively correlated with organic matter extremely significantly(R=-0.62),while that with total phosphorus and pH are not significant.Fet of soil layer Ⅰ(0~10 cm) increases obviously during the first 7 years after reclamation,and tends to become stable after 13 years,while those ages of soil layer Ⅱ(10~20 cm) are 8 years and 15 years respectively.Soil layer Ⅰ shows shorter responding time and better regularity than layer Ⅱ.Fed/Fet increases rapidly after reclamation,decreases later and then increases again.Feo/Fed indicates exponential decrease with the reclamation ages as well as Fep/Fed.Feo/Fed of layer Ⅰ decreases radically during the first 4 years after reclamation and tends to become stable after 13 years,while that of layer Ⅱ decreases dramatically within the first year and keeps stable henceforth.The counterparts of Fep/Fed are 6 years,14 years,and 2 years respectively.With the fitted experimental equations of Fet,Feo/Fed,and Fep/Fed,the ages of reclamation can be deduced reversely,which indicates the implication of iron on the shifts of soil environment.
【Fund】: 国家自然科学基金项目(40501030)
【CateGory Index】: S153
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