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为了研究有机肥的施用对三峡库区土壤养分和重金属含量变化的影响,试验通过施用牛粪有机肥种植牧草,重点研究有机肥施肥量对土壤质量和安全的影响。结果表明:土壤中氮、磷和钾含量随着有机肥施用量的增加而升高,与施用化肥相比,施用有机肥后土壤氮含量增幅较大;土壤中铜、锌、铅、镉、砷含量随着有机肥施用量的增加而升高,但符合《GB 15618—1995土壤环境质量标准》的要求。说明施用有机肥可以提高土壤养分含量,未造成土壤重金属污染;但施用的长期影响需要进一步研究。
In order to study the effects of organic manure application on the changes of soil nutrients and heavy metal contents in the Three Gorges Reservoir area, the experiments were conducted to evaluate the effects of organic manure on soil quality and safety by planting cattle manure. The results showed that the content of nitrogen, phosphorus and potassium in soil increased with the increase of organic fertilizer application. Compared with the application of chemical fertilizers, The content of arsenic increased with the increase of organic fertilizer application, but it met the requirements of “GB 15618-1995 Soil Environmental Quality Standard”. The results showed that the application of organic manure could increase soil nutrient content without causing heavy metal pollution in soil. However, the long-term effects of application need further study.