CAJ | 학술논문

以潜育水耕人为土为供试土壤，以不同的处理方式和培养时间下产生的紫云英水溶性有机物（DOM）为添加物（包括新鲜紫云英 DOM、淹水腐解7 d 和14 d 紫云英 DOM、好气腐解7 d 和14 d 紫云英 DOM；800 mg C·L-1），研究了5种 DOM 作为有机碳源促进淹水土壤中五氯酚（PCP）还原转化与 Fe（Ⅱ）累积的关系。结果表明，紫云英 DOM 在淹水6.5 d 后均可显著促进 PCP 的还原（P﹤0.05），淹水2 d 后显著促进了乙酸钠提取态 Fe（Ⅱ）[Fe（Ⅱ）NaOAc]和乙酸钠﹢盐酸连续提取态 Fe（Ⅱ）[Fe（Ⅱ）NaOAc﹢HCl]的累积（P﹤0.05）；多数情况下还可促进乙酸钠提取态 Fe（Ⅲ）[Fe（Ⅲ）NaOAc]的累积；多元线性回归分析发现，PCP 还原主要受 Fe（Ⅱ）NaOAc﹢HCl 影响，其逐步回归模型为：PCP（mg·kg-1）＝22.95-0.047Fe（Ⅱ）NaOAc﹢HCl（mg·kg-1）（R2＝0.615，P﹤0.01）。因此，DOM 促进了淹水土壤中 PCP 还原与铁还原，Fe（Ⅱ）累积是导致 PCP 还原转化的主要化学机制。
이잠육수경인위토위공시토양，이불동적처리방식화배양시간하산생적자운영수용성유궤물（DOM）위첨가물（포괄신선자운영 DOM、엄수부해7 d 화14 d 자운영 DOM、호기부해7 d 화14 d 자운영 DOM；800 mg C·L-1），연구료5충 DOM 작위유궤탄원촉진엄수토양중오록분（PCP）환원전화여 Fe（Ⅱ）루적적관계。결과표명，자운영 DOM 재엄수6.5 d 후균가현저촉진 PCP 적환원（P﹤0.05），엄수2 d 후현저촉진료을산납제취태 Fe（Ⅱ）[Fe（Ⅱ）NaOAc]화을산납﹢염산련속제취태 Fe（Ⅱ）[Fe（Ⅱ）NaOAc﹢HCl]적루적（P﹤0.05）；다수정황하환가촉진을산납제취태 Fe（Ⅲ）[Fe（Ⅲ）NaOAc]적루적；다원선성회귀분석발현，PCP 환원주요수 Fe（Ⅱ）NaOAc﹢HCl 영향，기축보회귀모형위：PCP（mg·kg-1）＝22.95-0.047Fe（Ⅱ）NaOAc﹢HCl（mg·kg-1）（R2＝0.615，P﹤0.01）。인차，DOM 촉진료엄수토양중 PCP 환원여철환원，Fe（Ⅱ）루적시도치 PCP 환원전화적주요화학궤제。
This study investigated the effects of dissolved organic matter(DOM)from green manure on pentachlorophenol(PCP)reduc-tive transformation and Fe(Ⅲ)reduction under flooded soil conditions. Batch experiments were conducted to explore the kinetics of PCP reductive transformation and its relationship with Fe(Ⅱ)accumulation in a flooded paddy soil(Gleyi-Stagnic Anthrosol)amended with fresh or decomposed(continuously-flooded, CF or non-flooded, NF; 7 and 14 d)DOM from Chinese milk vetch(Astragalus sinicus L., CMV; 800 mg C·L-1). The 5 treatments of CMV-derived DOM(CMV-DOM)significantly enhanced the reductive transformation of PCP and the accumulation of NaOAc-extractable or sequential NaOAc- and HCl-extractable Fe(Ⅱ)[Fe(Ⅱ)NaOAc﹢HCl] after 6.5 and 2 d of flooding, respectively(P﹤0.05). In most cases, the addition of CMV-DOM greatly increased NaOAc-extractable Fe(Ⅲ)owing to non-reductive dissolution. The relationship between reduction kinetics and selected environmental variables was examined by correlation analysis and regression analysis . Sequential NaOAc-and HCl-extractable Fe(Ⅱ)was found playing a vital role in PCP reductive transformation, and a stepwise regression model was established as follows: PCP(mg·kg-1)=22.95-0.047Fe(Ⅱ)NaOAc﹢HCl(mg·kg -1)(R2=0.615, P﹤0.01). The results demonstrated that addition of CMV-DOM accelerated PCP reductive transformation and Fe(Ⅲ)reduction in the flooded paddy soil. In terms of soil chemistry, enhanced PCP reductive transformation in flooded paddy soil is attributable to gen-eration of adsorbed Fe(Ⅱ)with high redox activity.