城市污泥对退化森林生态系统土壤的人工熟化研究

Artifical improvement of soil fertility in a regraded forest ecosystem by using municipal sewage sludge.

森林退化问题在热带亚热带地区较为严重 .在广东鹤山丘陵地区进行的野外试验结果表明 ,施用城市污水厂污泥可有效地促进树木的生长发育如增加株高和地径 ,对林中的灌草层植被也有促进和改善 ;同时可提高林地土壤肥力如土壤有机质和有效养分等 .对土壤重金属残留的监测表明 ,施用污水厂污泥后主要问题是增加了Pb含量 ,其增加量随污泥用量增加而增加 ;其它重金属增加不显著 .

The increasing occurrence of forest ecosystem degradation is a serious problem in tropical and subtropical regions.Field experiments showed that the application of sludge from a sewage treatment plant could not only promote the growth and reproduction of trees,including the increase in the height and diameter of trees and thus being advantageous to the growth of shrub and herb of trees,but also improve soil fertility such as increasing soil organic matter and available nitrogen and phosphorus.The test of residual heavy metals of soil indicated that the application of sludge increased the content of Pb in the soil and the increment of Pb was varied with the increase of sludge usage.There was no significant increase in other heavy metals.