Spatial Distribution and Risk Assessment of Heavy Metal, Carbon and Nitrogen Contents in Cultivated Land Surface and Profile along the Baima River in Shandong Province
Taking the cultivated lands along the Baima River in Shandong Province as the research object, the spatial distribution characteristics of heavy metals(including Cr, Cu, Mn, Ni, Pb, Zn), carbon and nitrogen in the surface and profiles were surveyed and analyzed. Their risks were evaluated by adopting the single factor pollution index (Ei) and potential ecological risk index (RI). The results showed that the contents of Cr, Cu, Ni and Pb in cultivated soil were lower than the second grade standard limit values of the National Soil Environmental Quality Standard. The content of Zn in individual profiles were slightly higher and the content of Mn was lower than the level of the Agricultural Land Soil Environment Quality Standards(Exposure Draft). The potential ecological risk indexes of cultivated land profiles ranged from 12. 97 to 20. 59, and they were in the slight ecological risk as a whole. The organic carbon content of tilling layer was small. The C /N ratios were in the range of 0. 90 ～ 12. 64 and most were lower than 10, which indicated the strong soil mineralization. In the controll of heavy metal pollution for cultivated land, we should simultaneously pay attention to the balance of elements in soil and improve the productivity of cultivated soil.
Cultivated land surfaceCultivated land profileHeavy metalC /N ratioSpatial distributionRisk assessment
国家科技期刊平台
NSTL
万方数据
维普
