Influences of PHEs vertical distribution and migration in soils in Zhangshi irrigated area
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摘要: 本文通过对典型环境功能区张士灌区包气带剖面样品和含水层样品的分析检测,比较和总结了菲的垂向分布特征,研究了总有机碳、粘粒含量、土壤含水率对菲垂向分布与迁移的影响规律和机理。对几个具有代表性采样点的研究表明、菲总含量在剖面中的变化趋势总体上是随着剖面的加深含量降低,以犁底层为界,表层土壤(5~20?)菲含量随着剖面深度变化平缓。同时分别对菲含量与总有机碳、土壤粘粒含量、土壤含水率进行二元相关分析,计算出的Pearson系数表明,土壤中总有机碳、土壤粘粒含量是影响菲垂向迁移的重要因素,而土壤含水率对菲垂向分布影响不大,同时利用SPSS的因子分析法进一步确定了总有机碳是制约菲垂向运移的主要因素。Abstract: The rule and mechanism that total organic carbon (TOC), clay content and water content influence PHEs vertical distribution and migration are shown in this paper by testing and analyzing soil samples from vadose zone and aquifer in Zhangshi irrigated area, the typical environment district. The relationship between PHEs and TOC, clay content and water content are analyzed separately by duality correlation method and the findings in several representative sampling spots indicate that the content of PHEs decrease generally with the depth from 5cm to 20cm of the soil. Pearson coefficient calculated demonstrates the important factors influencing the vertical distribution and migration are TOC and clay content, while soil water content could be neglected. SPSS factor analysis was further used to ensure that TOC is the key factor which limits the PHEs vertical distribution.
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