摘要:
在林业土壤施用城市污泥堆肥产品不会将重金属等污染物直接带入食物链，但是会改变土壤中重金属的含量，影响土壤环境。本文研究了施用城市污泥堆肥后梅花林与银杏林土壤中重金属含量的变化，并利用潜在生态风险评价法对其风险进行评价。评价结果表明：施肥一年后，梅花林和银杏林土壤的总体风险均属于低风险范围，Hg、Cd为风险的主要贡献者。从各重金属的风险分析，银杏林中Hg的污染已达到较高风险，且高施肥量的风险大于低施肥量。参比土壤背景值可以发现，在林地或园林绿地施用污泥堆肥时，需要考虑施肥场地土壤中重金属的背景值。
Application of municipal sludge compost in forestry
land will not directly bring pollutants, such as heavy metals, into food chain,
but it will change the content of heavy metals in soil. This paper studied
potential environment risk of heavy metals in Ginkgo land and Plum blossom land
after application of compost. The ecological risk index was used to evaluate
the potential ecological risk of heavy metals in soil. The results showed that
one year after fertilization, the Ginkgo and Plum lands had low ecological risk
in general, where Cd and Hg were the main pollution factors. However the pollution
of Hg in Ginkgo forest had reached high ecological risk. Moreover the
ecological risk is higher when the application of compost amount is greater.
Also, it can be found that soil background value is an important factor when
applying sewage sludge compost in forest lands.