根据重金属不同形态的环境风险引入毒性响应系数,确定污泥堆肥合理施用量。采用污染指数和地积累指数评价杨凌区污泥堆肥受重金属污染程度。初步确定陕西省杨凌区污泥堆肥合理施用量为3.69 t/(hm2.a),该方法突出了重金属形态的重要性,弥补了以往对重金属只进行总量控制的不足。评价结果显示,Cd是限制该地区污泥堆肥施用量的最主要元素。 According to the environmental risk of different forms of heavy metals, the toxicity response coefficient was introduced to determine the reasonable application rate of sludge compost. Using pollution index and ground accumulation index to evaluate the degree of heavy metal pollution in sludge composting in Yangling District. The reasonable application rate of sludge compost was 3.69 t / (hm2.a) in Yangling District of Shaanxi Province, which preliminarily confirmed the importance of heavy metal forms and made up for the deficiencies of total heavy metal control in the past. The evaluation results show that Cd is the most important element that limits the amount of sludge compost applied in this area.