论文部分内容阅读
通过田间和室内试验,探讨了绍兴银山贩水稻田砷污染防治的一些措施。结果表明:(1)施用铁、锰和石灰能不同程度地减少土壤中水溶性砷含量;铁、锰的加入在土壤淹水的情况下,使产量增加不显著,在搁田的情况下,使产量低于对照:石灰的加入引起土壤pH过高,导致减产68％。(2)搁田能显著提高土壤Eh,降低土壤中水溶性砷和其中的As(Ⅰ)％以及糙米含砷量,并增产22Ⅱ;施用紫云英能显著降低土壤Eh,可增加土壤中水溶性砷和其中的As(Ⅲ)％,使水稻前期生长较差。(3)在砷污染地区。宜种植552、沪红早一号等水稻品种,而不宜种植浙辐802、85—149等品种。(4)在绍兴银山畈,在土壤含全砷70mg/kg和100mg/kg以上时,浙辐802和二九丰的糙米含砷置分别超过了卫生标准。
Through field and laboratory experiments, some measures to prevent and control arsenic pollution in trafficked rice fields in Yinshan, Shaoxing were discussed. The results showed as follows: (1) Iron, manganese and lime could reduce the content of arsenic in soil to a certain extent; when iron and manganese were added into the soil, the output increased insignificantly under the condition of flooding, Lower production than control: Lime addition caused soil pH to be too high, resulting in a yield reduction of 68%. (2) Shetian can significantly increase soil Eh, reduce soil soluble arsenic and As (Ⅰ)% and brown rice arsenic, and increase yield 22 Ⅱ; Application of milk vetch can significantly reduce the soil Eh, can increase the soil water-soluble As arsenic and As (Ⅲ)% of them, the growth of rice in the early stage is poor. (3) In the arsenic pollution area. Should be planted 552, Shanghai Hong early on the 1st and other rice varieties, but not suitable for planting Zhejiang spokes 802, 85-149 and other varieties. (4) In Shaoxing Yinshanliao, when the soil contains total arsenic 70mg / kg and 100mg / kg, the concentrations of arsenic in the brown rice of Zhefu 802 and Erjifeng exceed the hygiene standards respectively.