海南省五指山土壤中的重金属元素含量

海南省地处热带地区，山地面积占25．4％，五指山是海南山地的核心，也是海南最高峰，从下而上依次分布着砖红壤、赤红壤、黄壤、灌丛草甸土。五指山土壤普遍遍缺，而Zn、Ni、Pb、Cd、Cr、Co含量属正常值。在成土过程中，Cd有一定积累，其他元素有明显淋溶。在自下而上的垂直带谱中，Zn、Co含量呈现递减，Cd则相反，Ni、Pb、Cu、Cr含量呈现波浪式变化。气候因素是影响五指山土壤重金属元素含量及分布的主导因素。

Heavy Metal in Soils of Wuzhi Mountain in Hainan Province

Wuzhi Mountain in Hainan Province locates in tropica l z one, which elevation is 1867 m The altitudinal belt from low level to high lev el is laterite, mountain lateritic red earth, moutain yellow earth, moutain mead ow soil respectively The average contents of heavy metal in soils are: Zn 24 79mg/kg, Ni 10 40mg/ kg, Cu 3 15mg/kg, Pb 16 88mg/kg, Cd 0 028mg/kg, Cr 14 46mg/kg, Co 3 33mg/kg Zn, Ni, Pb, Cd, Cr, Co are in normal level while Cu is low In soil forming progress, Cd is accumulative while Zn, Ni, Cu, Pb, Cr, Co are eluviational The eluviation intensity from high to low is Co>Pb>Ni>Cr>Zn>Cu Cd increases gradu ally from low level to high level of altitude belt while Zn and Co are on the co ntrary The content value and distribution of these heavy metals are mainly depe rd on soil forming rock and climatic factor