城市污泥应用于毛白杨林地研究

Study on the Application of Municipal Sewage Sludge in Populus tomentosa Woodland

研究了城市污泥的施用季节、施用方式及施用量对毛白杨生长及土壤理化性状的影响,结果表明,污泥对毛白杨生长有促进作用,春季施入优于雨季,沟状施入效果好,以75 kg/株最佳;污泥的施入改善了土壤的理化性状。污泥施入毛白杨林地4年,100～120 cm的土层中硝态氮含量低于40 mg/kg,镉含量与对照相近,不会对地下水造成污染。

Effects of application seasons,methods and amount of municipal sewage sludge on the growth of P.tomentosa and physicochemical properties of soil were studied.The results showed that the municipal sewage sludge has promoting effect to the growth of P.tomentosa,and the application in spring is better than in rainy season,sulciform adding is the best method of application and the fertilizing amount of 75 kg/plant is best.The municipal sewage sludge also shows a promoting effect to the physicochemical properties of the soil,after 4 years of adding the sewage sludge into soil,the amount of nitrate nitrogen in the soil layer of 100-120 cm is less than 40 mg/kg,and the amount of cadmium is close to the control,it will not cause ground water pollution.