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| Effect of organic matter and iron oxides on phosphorus forms and adsorption-desorption on dry-period soils in the waterlevel-fluctuating zone of the Three Gorges Reservoir |
| YAN Jin-long1,2, WU Wen-li1, JIANG Tao2, WEI Shi-qiang2 |
1. College of Pharmacy and Biological Engineering, Chongqing University of Technology, Chongqing 400054, China;
2. College of Resources and Environment, Southwest University, Chongqing 400716, China |
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Abstract Selective removal of organic matter or iron oxide from three typical dry-period soils were explored to investigate its direct effect on P fractions and adsorption-desorption behavior in the water-level-fluctuating zone (WLFZ) of the Three Gorges Reservoir (TGR). The data showed that kinds of P fractions in three dry-period soils were not significant decreased with removal of readily oxidizable organic matter. However, kinds of P fractions were significantly decreased with removal of free iron oxides in the three soils. Notably, different P fractions were both in the order as follows: Ca-P > OP > Fe/Al-P, before and after removal of organic matter or free iron oxides in the three soils. Moreover, after removal of organic matter, the adsorption capacity of yellow soil (FJ), purple alluvial soil (KX), grey brown purple soil (FL) for P was only decreased by 0.5%, 2.3%, 6.5%(P=0.017<0.05, significant difference), respectively, which indicated that P adsorbed on the three soils were little influenced by organic matter. In addition, after removal of free iron oxides, the adsorption capacity of FJ, KX, FL soil for P was significantly decreased by 45.6%, 51.7%, 43.9%(P=0.004<0.05, significant difference), respectively, which revealed that P adsorbed on the three soils were dominated by free iron oxides. More importantly, the desorption capacity of three soils for P was increased after removal of free iron oxides, which presented that free iron oxides were also the predominant factor to control desorption behavior of freshly sorbed P. Then, the desorption capacity of FL for P was little decreased after removal of organic mater, and there were no distinction for it before and after removal of organic matter in KX and FJ soils, which showed that the desorption capacity of three soils for P were influenced by organic matter related to soil category.
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Received: 13 August 2018
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| Cite this article: |
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YAN Jin-long,WU Wen-li,JIANG Tao等. Effect of organic matter and iron oxides on phosphorus forms and adsorption-desorption on dry-period soils in the waterlevel-fluctuating zone of the Three Gorges Reservoir[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(3): 1124-1131.
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| URL: |
| http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I3/1124 |
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