摘要
【目的】开展重金属土壤环境容量研究,准确了解土壤环境承载力,为土壤环境质量评价、区域重金属污染研究与控制等提供科学依据。【方法】通过土壤环境容量计算模型估算精河县土壤重金属元素的静态和动态环境容量,并预测其发展趋势。【结果】草甸土、林灌草甸土、风沙土和盐土4种土壤类型的各种重金属元素的静态容量排序为:Pb>Cr>Zn>Cu>Co。各重金属元素在不同年限下、不同土壤类型中的动态容量排序为:Co和Pb在控制年限20、50、80 a时为盐土>林灌草甸土>草甸土>风沙土;Cr、Cu和Zn在控制年限20、50、80 a时为盐土>林灌草甸土>风沙土>草甸土;5种元素在控制年限100 a时各土壤类型的动态容量基本保持一致。盐土和林灌草甸土的重金属静态容量高于风沙土和草甸土,可以充分利用容量较大的土壤实现经济发展。【结论】精河县土壤综合质量指数为2.354 7,污染级别为Ⅳ级,属中度污染。精河县土壤中的其它重金属元素在保持目前不受污染现状值的情况下,随着土壤自净作用,环境污染现状会趋于好转。
[ Objective ] To inquire the soil environmental capacity of heavy metals, to understand the car- rying .capacity of soil environment accurately, provide a scientific basis on the soil quality assessment and re- search the control over the regional heavy metal pollution. [ Method ] The static and dynamic environmental ca- pacity of soil heavy metals in Jinghe county were estimated by the model of soil environmental capacity, and the development trend was predicted. [ Result ] Ranking of the static capacity of heavy metals in these 4 sorts of soil in Jinghe County were： meadow soil, shrub meadow soil, aeolian sandy soil and saline soil： Pb 〉 Cr 〉 Zn 〉 Cu 〉 Co ; While the dynamic capacity of the same heavy metals in different types of soil were ： when Co and Pb are in control terms 20, 50, 80 years： saline soil 〉 shrub meadow soils 〉 meadow soil 〉 aeolian sandy soil ; and when Cr, Cu, Zn are in control terms 20, 50, 80 years ： saline soil 〉 shrub meadow soils 〉 aeolian sandy soil 〉 meadow soil; all these elements got the same average annual capacity when the control term is 100 years despite the types of soil. The static capacity of heavy metals in saline soil, shrub meadow soil were both larger than that in aeolian sandy soil and meadow soil, so it is possible to take advantage of the larger soil capacity for the local economic development. [ Conclusion ] Soil comprehensive quality index in Jinghe County is 2. 354,7, the pollution level belongs to Ⅳ, and the degree of pollution is medium. It will be a improved situation by its＇ self - purification if there were no more additional pollution by the other heavy metals in Jinghe County.
出处
《新疆农业科学》
CAS
CSCD
北大核心
2016年第8期1521-1532,共12页
Xinjiang Agricultural Sciences
基金
国家自然科学基金重点项目(41130531)~~
关键词
环境容量
土壤重金属
静态容量
动态容量
土壤质量评价
environmental capacity
soil heavy metals
static capacity
dynamic capacity
soil quality assessment
