Effects of Earthworms and Ryegrass on the Removal of Fluoranthene from Soil

JING Yong-Ping; LIU Man-Qiang; YIN Qi-Peng; LI Hui-Xin; HU Feng

摘要

Earthworms can promote the bioremediation of contaminated soils through enhancing plant growth and microorganism development.The individual and combined effects of earthworms and ryegrass (Lolium multiflorum Lam.) on the removal of fluoranthene from a sandy-loam alluvial soil were investigated in a 70-d microcosm experiment.The experiment was set up in a complete factorial design with treatments in four replicates:without earthworms or ryegrass (control,CK),with earthworms only (E),with ryegrass only (P),and with both earthworms and ryegrass (EP).The residual fluoranthene,microbial biomass C,and polyphenol oxidase activity in the soil changed significantly (P ＜ 0.01) with time.In general,the residual concentration of fluoranthene in the soil decreased sharply from 71.8-88.7 to 31.7-37.4 mg kg-1 in 14 d,and then decreased gradually to 19.7-30.5 mg kg-1 on the 70th d.The fluoranthene concentration left in the soil was the least with both earthworms and ryegrass,compared to the other treatments at the end of the experiment.Half-life times of fluoranthene in the E,P,and EP treatments were 17.8％-36.3％ smaller than that of CK.More fluoranthene was absorbed by earthworms than ryegrass.However,the total amounts of fluoranthene accumulated in both the ryegrass and earthworms were small,only accounting for 0.01％-1.20％ of the lost fluoranthene.Therefore,we assumed that microbial degradation would play a dominant functional role in fluoranthene removal from soil.We found that earthworms significantly increased microbial biomass C and polyphenol oxidase activity (P ＜ 0.01) in the presence of ryegrass at the end of the experiment.Furthermore,microbial biomass C and polyphenol oxidase activity were significantly (P ＜ 0.05) and negatively related to the residual fluoranthene concentration.This implied that earthworms might promote the removal of fluoranthene from soil via stimulating microbial biomass C and polyphenol oxidase activity.

机译：can可通过促进植物生长和微生物发育来促进受污染土壤的生物修复。在70天内研究了and和黑麦草（Lolium multiflorum Lam。）对从砂壤土冲积土壤中去除荧蒽的单独和联合作用。缩影实验。该实验以完整的因子设计进行设置，并进行四次重复处理：不带earth或黑麦草（对照，CK），仅带（（E），仅带黑麦草（P），同时带and和黑麦草（土壤中的荧蒽残留量，微生物生物量碳和多酚氧化酶活性随时间变化显着（P ＜0.01）。一般而言，土壤中荧蒽的残留浓度从71.8-88.7急剧下降至31.7-37.4 mg 14 d时kg-1，然后在70 d逐渐降低至19.7-30.5 mg kg-1。and和黑麦草中土壤中残留的荧蒽浓度最小，而另一种则为实验结束时，E，P和EP处理的荧蒽半衰期比CK缩短了17.8％-36.3％。earth吸收的荧蒽比黑麦草多。黑麦草和earth中积累的荧蒽很小，仅占丢失的荧蒽的0.01％-1.20％。因此，我们认为微生物降解将是从土壤中去除荧蒽的主要功能。我们发现earth显着增加了微生物实验结束时，在黑麦草的存在下，生物量碳和多酚氧化酶活性（P ＜0.01）。此外，微生物量碳和多酚氧化酶的活性显着（P ＜0.05），与残留的荧蒽浓度负相关。 earth可能通过刺激微生物生物量碳和多酚氧化酶的活性来促进从土壤中除去荧蒽。

Effects of Earthworms and Ryegrass on the Removal of Fluoranthene from Soil

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