Transfer and transformation of soil iron and implications for hydrogeomorpholocial changes in Naoli River Catchment,Sanjiang Plain,Northeast China |
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| Authors: | Ming Jiang Xianguo Lu Hongqing Wang Yuanchun Zou Haitao Wu |
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| Institution: | (1) Key Lab of Wetland Ecology and Environment, Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, 3195 Weishan Road, Changchun, 130012, China;(2) Key Lab of Isotope Geochronology and Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, P.O. Box 1131, Guangzhou, 510640, China;(3) Wetland Biogeochemistry Institute, Louisiana State University, Baton Rouge, LA 70803, USA;(4) Biogeochemistry Department, Max Planck Institute for Chemistry, P.O. Box 3060, D-55020 Mainz, Germany |
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| Abstract: | Wetland soils are characterized by alternating redox process due to the fluctuation of waterlogged conditions. Iron is an
important redox substance, and its transfer and transformation in the wetland ecosystem could be an effective indicator for
the environment changes. In this paper, we selected the Naoli River catchment in the Sanjiang Plain, Northeast China as the
study area to analyze the dynamics of transfer and transformation of soil iron, and the relationship between iron content
change and environmental factors. The results show that the total and crystalline iron contents reach the peak in the depth
of 60 cm in soil profile, while the amorphous iron content is higher in the topsoil. In the upper reaches, from the low to
high landscape positions, the total and crystalline iron contents decrease from 62.98 g/kg to 41.61 g/kg, 22.82 g/kg to 10.53
g/kg respectively, while the amorphous iron content increases from 2.42 g/kg to 8.88 g/kg. Amorphous iron content has positive
correlation with organic matter and soil water contents, while negative correlation with pH. Moreover, both the crystalline
and amorphous iron contents present no correlation with total iron content, indicating that environmental factors play a more
important role in the transfer and transformation of iron other than the content of the total iron. Different redoximorphic
features were found along the soil profile due to the transfer and transformation of iron. E and B horizons of wetland soil
in the study area have a matrix Chroma 2 or less, and all the soil types can meet the criteria of American hydric soil indicators
except albic soil. |
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