摘要
采用地理信息系统(GIS)技术和地统计学相结合的方法,研究了黑龙江南部典型黑土区双城市土壤全量铜(Cu)、锌(Zn)、铅(Pb)、镍(Ni)、镉(Cd)5种主要重金属元素的空间分异规律。结果表明:研究区土壤各重金属的半方差函数模型均可用球状模型和指数模型较好地拟合。其中Zn、Ni和Cd具有强烈的空间相关性,表明这3种重金属元素受土壤内在属性影响较大。而Cu和Pb具有中等强度的空间相关性,表明这2种重金属元素由土壤内在属性和人为因素共同起作用。Cd、Pb和Cu较Zn和Ni的变程小,说明研究区土壤前3种重金属元素含量可能主要受到较小尺度因子的影响。研究区土壤各重金属元素空间分异规律如下:Cu和Ni呈东高西低的趋势,Pb呈南高北低的趋势,而Zn和Cd分别表现为块状分布和岛状分布的特点。图3,表2,参8。
Gengraphical information system （GIS） combined with geostatistics was applied to reveal the spatial variability of heavy metals including Cu, Zn, Pb, Ni and Cd in soils of Shuangcheng in the southern black soil area of Heilongjiang Province. The results showed that theoretical semivafiogram models of 5 heavy metals were best described with spherical or exponential models. The spatial correlations of Zn, Ni and Cd were strong, which were affected by intrinsic characters of soils, whereas the spatial correlations of Cu and Pb were moderate, indicating that they were affected by intrinsic characters of soil and random factors together. The ranges of Cd, Pb were nearer than Cu, Zn and Ni, indicating that the 3 former heavy metals were affected by shorter range factors. The spatial variability characters of heavy metals in studied area soil were as follows. The contents of Cu and Ni were decreased from east to west, and contents of Pb were decreased from south to north, whereas the distribution of Zn was blocked and Cd was insular.
出处
《农业系统科学与综合研究》
CSCD
2007年第1期65-68,73,共5页
System Sciemces and Comprehensive Studies In Agriculture
基金
黑龙江省自然科学基金重点项目(ZJN03-02)
关键词
黑土区
重金属
空间分异
GIS
地统计学
black soil area
heavy metals
spatial variability
GIS
geostatistics
