有机肥对污染土壤上蚯蚓生长及Cd和Pb吸收的影响

Effects of Organic Fertilizer on Earthworm Growth,Cd and Pb Absorption in Contaminated Soil

为促进重金属污染土壤的修复,以赤子爱胜蚓为试验动物,以秸秆、牛粪、羊粪作为供试有机肥,采用室内接种法,研究有机肥对复合污染土壤上蚯蚓生长和Cd和Pb吸收的影响。结果表明:在不同处理条件下,污染土壤中蚯蚓数量顺序大小依次为秸秆>羊粪>牛粪>CK(不添加有机肥),其中施用秸秆有机肥时有较少的产卵量;蚯蚓个体均重大小顺序为秸秆>牛粪>羊粪>CK;与对照相比,添加牛粪、羊粪和秸秆后,蚯蚓体内Cd含量分别降低了84.60%、94.02%和8.67%,蚯蚓体内Pb含量分别降低了16.53%、15.04%和4.17%。试验后土壤有效态Cd和Pb含量大小顺序均为CK>羊粪>牛粪>秸秆,其中秸秆处理组土壤有效态Cd和Pb浓度与对照相比分别降低了1.45和430.35mg·kg^-1。因此,秸秆发酵有机肥较适合于蚯蚓的生长,利于蚯蚓富集土壤中的重金属Cd和Pb。

In order to promote the remediation of heavy metal soils,using earthwormEisenia foetida as experimental animal and straw,cow manure and sheep manure as organic fertilizer,the effects of organic fertilizer on earthworm growth and Cd,Pb uptake in compound polluted soil were studied by indoor inoculation method.The results showed that,under different treatment conditions,the order of earthworm quantity in polluted soil was straw>sheep manure>cow manure>CK(without adding organic fertilizer),and there was less fecundity when applying straw organic fertilizer;the order of average weight of earthworm was straw>cow manure>sheep manure>CK;compared with the control,the CD content in earthworm decreased by 84.60%after adding cow manure,sheep manure and straw.The content of Pb in earthworm decreased by 16.53%,15.04%and 4.17%,respectively.After the experiment,the order of soil available Cd and Pb content was CK>sheep manure>cattle manure>straw.Compared with the control,the concentration of soil available Cd and Pb in straw treatment group decreased by 1.45 and 430.35 mg·kg^-1,respectively.Therefore,straw fermented organic fertilizer is more suitable for the growth of earthworm,which is conducive to the accumulation of heavy metals Cd and Pb.