在林業土壤施用城市污泥堆肥產品不會將重金屬等污染物直接帶入食物鏈，但是會改變土壤中重金屬的含量，影響土壤環境。本文研究了施用城市污泥堆肥后梅花林與銀杏林土壤中重金屬含量的變化，并利用潛在生態風險評價法對其風險進行評價。評價結果表明：施肥一年后，梅花林和銀杏林土壤的總體風險均屬于低風險范圍，Hg、Cd為風險的主要貢獻者。從各重金屬的風險分析，銀杏林中Hg的污染已達到較高風險，且高施肥量的風險大于低施肥量。參比土壤背景值可以發現，在林地或園林綠地施用污泥堆肥時，需要考慮施肥場地土壤中重金屬的背景值。

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.