摘要
采用土柱模拟实验,比较研究了覆盖绿化植物废弃物与土壤之上和绿化植物废弃物与土壤混合处理对城市绿地土壤中重金属淋溶的影响。结果表明,Zn、Pb和Cd均在80天后淋溶完全,而Cu有所不同,在80天后又有增加的趋势,原因可能跟重金属与有机质的结合能力有关。此外,绿化植物废弃物与土壤相混合能抑制Cu、Zn、Pb和Cd向下淋溶,而绿化植物废弃物覆盖于土壤之上则有促进Cu、Zn、Pb和Cd淋溶的趋势,且不论是混合处理还是覆盖处理,20cm厚绿化植物废弃物的处理均比10cm厚绿化植物废弃物处理对Cu、Zn、Pb和Cd的促进或抑制作用大。研究还得知,Cu、Zn、Pb和Cd的迁移还与土壤pH有关,低pH土壤有利于重金属的淋溶。
The effects of greenery waste mulching and addition of greenery waste into soils by homogeneous mixing on Cu,Zn,Pb and Cd leaching in soils were investigated by column leaching tests.The results showed that Zn,Pb and Cd were leached entirely after 80 days,however,the leaching of Cu was different and there was still an increase even after 80 days,which may be related to heavy metal affinity to soil organic matter.The vertical migration of Cu,Zn,Pb and Cd in soils was inhibited after being mixed with greenery waste,whilst on the contrary,their migration was promoted for greenery waste mulching treatment.Furthermore,treatment of 20 cm greenery waste had a greater positive or negative effect than that of 10 cm on leaching of Cu,Zn,Pb and Cd in soils for either mulching or mixing addition mode.The results also indicated that the migration of Cu,Zn,Pb and Cd was also related to the pH of soil systems,and a lower pH value would be favorable to the leaching of heavy metals in soils.
出处
《水土保持学报》
CSCD
北大核心
2010年第2期205-209,共5页
Journal of Soil and Water Conservation
基金
上海市建设和交通委员会资助项目(重科2008-006)
关键词
重金属
绿化植物废弃物
灰潮土
黄泥土
淋溶
Cu
Zn
Pb
Cd
greenery waste
calcareous chao soil
yellow clay soil
leaching
