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| Effects of soil moisture on available arsenic and alkaline phosphatase activity in paddy soil |
| XIE Wei1,2, TAN Xiang-ping1, TIAN Hai-xia1, WANG Zi-quan1, YANG Rui1, WEI Ge-hong3, HE Wen-xiang1,2 |
1. College of Resources and Environment, Northwest A & F University, Yangling 712100, China;
2. Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China;
3. College of Life Sciences, Northwest A & F University, Yangling 712100, China |
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Abstract The relationship of available arsenic and soil alkaline phosphatase activity at different soil moistures (35%, 65% and 110% of water holding capacity) was studied by an indoor simulated experiment. The results showed that available arsenic content increased after arsenic pollution and declined with aging until held steady after 15days. Flooding reduced the available arsenic content and soil alkaline phosphatase activity. The relationship of soil enzymatic activities (U) and arsenic concentration (C) was described well by the model U=A/(1+B×C), which indicated that soil alkaline phosphatase activity could be a good predictor for arsenic pollution in paddy soil under different soil moistures. Ecological dose 10% (ED10) of total and available arsenic were 67mg/kg and 11mg/kg in paddy soil, respectively. The results of this study suggested that it was an efficient way to appropriately change the soil moisture to relieve the toxicity of arsenic contamination in paddy soil.
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Received: 18 January 2016
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