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| Accumulation and environmental capacity of Cu and Zn in soil-crop with swine manure applying and straw returning |
| Received:March 15, 2016 |
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| KeyWord:swine manure;straw;wheat;rice;Cu;Zn;environmental capacity |
| Author Name | Affiliation | | WANG Qiong-yao | Sichuan Province Natural Resources Science Academy, Chengdu 610015, China | | LI Sen | Sichuan Province Natural Resources Science Academy, Chengdu 610015, China | | ZHOU Ling | Sichuan Province Natural Resources Science Academy, Chengdu 610015, China | | WANG Gui-yin | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | ZHANG Chu-er | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China | | ZHANG Shi-rong | College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China |
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| Abstract: |
| To assess the security of soil and crop after agricultural waste application, a field experiment under rice-wheat rotation with different swine manure-straw treatments was conducted to evaluate the pollution characteristics and dynamic changes of Cu and Zn in soil-crop, and estimate their static environmental capacity, and the highest application rate of swine manure. The Cu and Zn concentrations in the surface soil among the treatments slightly increased after the swine manure-straw incorperation, and showed no significant differences(P>0.05). Moreover, they in rice and wheat growing season were within the scope of Class Ⅰ of the soil environment quality, and their cumulative indexes(Igeo) were less than zero. In addition, the Cu and Zn concentrations in rice and wheat grain were small than the threshold for the national food safety standards of food contaminants, and the pollution indexes(PI) were less than 1. Therefore, swine manure-straw returning did not have significant effects on the soil and crop. The static environmental capacities of soil Cu and Zn decreased after rice-wheat rotation, and the minimum static environmental capacities were 11.32 and 135.06 kg·hm-2. Considering the Cu and Zn pollution safety problems, we suggest that the application amount of swine manure should be less than 1 028.77 t·hm-2 after rice-wheat rotation. |
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