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植物间作下根际微生物和土壤酶与土壤多氯联苯(PCB)降解的关系

Keywords: 多氯联苯,植物间作,土壤酶,微生物,分泌物

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Abstract:

以大豆、黑麦草和南瓜为材料,采用盆栽实验,研究了3种植物的单作和相互间作的不同种植方式对多氯联苯污染土壤的根际修复效应与机理。结果表明:(1)PCB去除率与土壤蛋白酶和磷酸酶活性均呈极显著正相关关系,相关系数分别为0.878和0.929(P<0.01),推测这两类酶可能参与了PCB的生物降解过程;(2)PCB去除率与土壤真菌密度呈显著相关(r=0.797),而PCB去除率与土壤细菌及放线菌密度相关不显著;(3)在本实验条件下,微生物因素对土壤PCB的降解起主导作用,非灭菌土处理的土壤PCB去除率比灭菌土相对应的对照高出17.7%~30.75%;(4)根系分泌物能显著强化微生物的降解功能,添加黑麦草和大豆根系分泌物处理的土壤PCB去除率分别比只加营养液的对照高出21.4%和24.9%。

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