CAJ | 학술논문

采用批量平衡试验方法,研究了模拟根系分泌物(ARE)对黄棕壤、棕红壤和红壤吸附菲的影响.结果表明,3种土壤对菲的等温吸附曲线均为线性,加入ARE后,土壤吸附菲的分配系数(K_d)和有机碳标化的分配系数(K_(oc))显著降低,且降低量随着ARE浓度的增加而增大,表明ARE抑制了土壤对菲的吸附.土壤有机质含量越低,ARE对土壤吸附菲的抑制作用越明显.分析土样吸附菲的平衡溶液中水溶性有机质(DOM)浓度,发现加入ARE后土壤有机质含量略有降低(<1.640),而DOM浓度增大,DOM与菲的结合作用对土壤吸附菲的抑制作用增强,这可能是ARE抑制土壤吸附菲的主要原因.
채용비량평형시험방법,연구료모의근계분비물(ARE)대황종양、종홍양화홍양흡부비적영향.결과표명,3충토양대비적등온흡부곡선균위선성,가입ARE후,토양흡부비적분배계수(K_d)화유궤탄표화적분배계수(K_(oc))현저강저,차강저량수착ARE농도적증가이증대,표명ARE억제료토양대비적흡부.토양유궤질함량월저,ARE대토양흡부비적억제작용월명현.분석토양흡부비적평형용액중수용성유궤질(DOM)농도,발현가입ARE후토양유궤질함량략유강저(<1.640),이DOM농도증대,DOM여비적결합작용대토양흡부비적억제작용증강,저가능시ARE억제토양흡부비적주요원인.
The sorption of phenanthrene by three soils with addition of artificial root exudate (ARE) was investigated using a batch experimental method. Phenanthrene sorption isotherms by soils could be significantly described by a liner sorption model irrespective of the addition of ARE. The distribution coefficients (K_d) and the organic carbon-normalized distribution coefficients (K_(oc)) for phenanthrene sorption were significantly lower when ARE present in soils, and K_d and K_(oc) values tended to decrease with increasing the concentrations of ARE in soils. The concentrations of dissolved organic matter (DOM) in equilibrium solution for phenanthrene sorption were detected, and DOM concentrations were higher with the addition of ARE. While the soil organic carbon content was observed to be a little lower with the ARE addition. The combination of DOM and phenanthrene in solution was proposed to dominate the decrease of phenanthrene sorption in soils with the addition of ARE. Results of this work indicated that root exudate clearly inhibited the sorption of PAHs, and thus could enhance their availability in soil environment.