排土场植被恢复对局部生态环境的影响

摘要

After afforestation in dump,the concentration of harmful gases significantly reduced due to the increased vegetation cover rates.SO2 ,NOX ,CO concentration between the forest land & non-stocked land were monitored by fixed spots in the dump discharging refuse with 50 years.SO2 ,NOX,CO concentration of forest decrease by 31.8%,34.5%,20.1% respectively than that of non-stocked land.The content of total nitrogen,total potassium of nutrient content in the waste rock debris regolith increase by 33.3% &16.6% respectively;soil surface tempera-ture,soil temperature (0-10 cm),air temperature (height being 50 cm)reduce by 9.9 ℃,10.7 ℃,1.5 ℃,re-spectively;relative humidity increase from 4% to 1 5% .%排土场造林后,由于林草植被覆被率增加,使有害气体的浓度显著降低。通过对排矸年限50年的排土场内有林地和无林地的 SO2、NOX、CO 浓度的定点监测,结果表明：有林地比无林地 SO2、NOX、CO 浓度分别降低31.8%、34.5%、20.1%；风化层矸石碎屑养分含量全氮、全钾含量分别增加33.3%和16.6%；地表温度、土壤温度(0~10 cm)、空气温度(高50 cm)分别降低9.9℃、10.7℃、1.5℃,相对湿度却增加4%~15%。