녹비식물 혼합재배에 휴믹물질 투입이 정화처리토양의생물학적 토양 건강성 지표에 미치는 영향

초록

The effects of green manure crops, hairy vetch and sesban, supplemented with HS (humic substance) on biological soilhealth indicators was studied in a pot containing two kinds of reclaimed soil previously contaminated with petroleumhydrocarbons; a soil remediated by land-farming (DDC) and another soil by low-temperature thermal desorption (YJ). Treatments include no plant (C), plants only (H), and plants+2% HS (PH), which were evaluated in a pot containingrespective soil. Biological indicators include microbial community analysis as well as soil enzyme activities ofdehydrogenase, β-glucosidase, N-acetyl-β-D-glucosaminidase (NAG), acid/alkaline phosphatase, arylsulfatase, and urease. Results showed an increase of enzyme activities in pot soils with plants and even greater in soils with plants+HS. Theenzyme activities of DDC soil with plants (DDC_P) and with plants+HS (DDC_PH) increased 1.6 and 3.9 times onaverage, respectively than those in the control. The enzyme activities YJ soil with plants (YJ_P) and with plant+HS(YJ_PH) increased 1.8 and 3.8 times on average, respectively than those in the control. According to microbial communityanalysis, the relative abundance of nitrogen-fixing bacteria in DDC and YJ soil was increased from 1.5% to 7% and from 0 to5%, respectively, after planting hairy vetch and sesban. This study showed that mixed planting of green manure crops with asupplement of humic substance is highly effective for the restoration of biological health indicators of reclaimed soils.

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