Influences of PHEs vertical distribution and migration in soils in Zhangshi irrigated area

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.