蚯蚓和发酵牛粪促进南瓜苗修复PAHs污染农田土壤

为了寻求高效修复土壤中持久性有机污染物多环芳烃(PAHs,polycyclic aromatic hydrocarbon),在温室盆栽试验条件下,研究接种蚯蚓和施用发酵牛粪对南瓜苗修复3环以上PAHs污染土壤的影响。试验设置施用牛粪(D)、单接蚯蚓(E)、接种蚯蚓和施用牛粪(ED)、不接种蚯蚓和不施用牛粪的对照(CK)共4个处理,播种10周后收获。研究结果表明,接种蚯蚓和施用牛粪的共同作用下能有效提高南瓜苗生物量,有利于南瓜苗在PAHs污染的土壤生长,特别是地上部分的生长;接种蚯蚓或/和施用牛粪有效地提高了南瓜苗从土壤中吸收3～5环PAHs化合物的效率,且南瓜苗地上部吸收的PAHs量最低是地下部的6倍。因此,结合蚯蚓和发酵牛粪的辅助作用,南瓜苗地上部生物量较大,能从土壤中吸收多种PAHs化合物,与仅依赖于土壤自身的作用相比,三者的共同作用使得土壤中3环以上PAHs化合物的去除率提高23%以上,可组合应用于PAHs污染土壤的强化修复。该研究为土壤多环芳烃污染修复提供参考。

Remedying PAHs contaminated farmland soil by zucchini with earthworm and fermented cow dung application

Polycyclic aromatic hydrocarbons(PAHs) are persistent organic pollutants in the soil.Efficient remediation of PAHs in the soil has been a hot research.In this study,inoculated earthworms and fermented cow dung were used to phytoremedy soil contaminated by PAHs in order to improve the efficiency of bioremediation.A pot culture experiment was carried out to study the influence of fermented cow dung(FCW) and earthworm on remedying soil contaminated by polycyclic aromatic hydrocarbons(PAHs) using zucchini(Cucurbita moschata.Four treatments containing ①adding FCW;②e arthworms inoculation;③e arthworms inoculation and adding FCW;④n on-inoculum and adding FCW(CK);⑤non-inoculum,adding FCW and planting(NO),were applied to PAHs contaminating soil.The plants were harvested after 10 weeks of growth.The joint action of earthworm inoculation and adding FCW promoted plant biomass and was good for plant surviving in soil contaminated by PAHs.The treatment of earthworm inoculation only and FCW added improved the efficiency that PAHs(3-5 rings) were absorbed into the plant,and the lowest PAHs content in shoots was 6 times of that in roots.Compared to the role of the soil itself,the removal efficiency of PAHs compounds above 3 ring increased more than 23% by interaction of earthworms inoculation,FCW and zucchini.Therefore,with earthworms and FCW,the zucchini played a potential role in phytoremediation of PAHs contaminating soil.