丘陵林地土壤酸化改良剂的集中施用-自然扩散修复技术研究

Study the Restoration Technology of Concentrated Application-Natural Diffusion about Amendments of Acidified Soil of Hilly Woodland

丘陵林地土壤酸化修复在维持林地生态系统生产力稳定中具有重要地位.本试验通过在丘陵林地坡顶集中施用石灰、污水污泥和联合施用石灰+污水污泥3种土壤酸化改良剂,研究了3种改良剂对丘陵林地酸化土壤的修复效果.结果表明:①联合施用污水污泥+石灰能够显著(P<0.05)降低土壤酸度,促进土壤有机质和氮素含量快速上升,增加土壤阳离子交换量(CEC),从而有效改良丘陵林地酸化土壤;②土壤改良剂在丘陵林地上坡位集中施用,能够通过径流和泥沙随坡体向下坡迁移的自然扩散机制,使丘陵大面积酸化土壤得到修复;③将城市污水污泥用于丘陵酸化土壤的修复,有利于解决城市污水污泥的污染问题,但只限于非经济林酸化土壤的恢复.

Through concentrated application of lime,sewage sludge and lime＋sewage sludge on the sloping top of the hilly woodlands,the restoration effects of the three soil amendments on the acidified soil of hilly woodland were studied.The results showed that： ①Joint application of sewage sludge＋lime can significantly（P0.05） decrease soil acidity,promote the rapid increase in soil organic matter and nitrogen content,Increase soil cation exchange capacity,and effectively improve acidified soil.②Through natural diffusion mechanisms of surface and subsurface runoff,a large area of acidified soil of hilly woodlands can be restored by concentrated application of soil amendments on the sloping top of the hilly woodlands.③It is conducive to solve the pollution problems of the urban sewage sludge by using municipal sewage sludge to restore acidified soil,but only for the restoration of acidified soil of timber forest.