摘要
采用地统计学与GIS相结合的方法,对黑河中游绿洲农田土壤中Cu、Zn、Ni、Fe、Mn和Co含量的空间变异特征、分布规律进行了研究。结果表明:研究区土壤Zn、Fe、Mn的含量平均值低于全国平均值,而Cu、Ni、Co的平均值高于全国平均值,6种微量元素均具有中等程度变异,且各微量元素样本均符合正态分布;土壤Cu、Ni含量的最佳半方差拟合模型为高斯模型,Zn、Fe和Mn为球状模型,Co为指数模型;土壤Cu、Zn、Ni、Fe、Co具有中等程度的空间相关性,土壤Mn具有强烈的空间相关性;6种微量元素含量的变程大小顺序为Cu、Zn、Mn>Fe>Co>Ni;土壤Cu、Zn、Fe、Mn含量的空间分布特征相似,即总体上为由东南向西北降低,Ni、Co含量呈现斑块状分布。研究区土壤中微量元素含量除Mn主要受自然因素影响外,其它各微量元素均受到自然因素和人为因素的双重影响。
The method of geostatistics combined with GIS was applied to study the variability characteristics, distribution laws of Cu ,Zn ,Ni ,Fe,Mn and Co contents in oasis cropland soil of the middle Reaches of HeiHe River. The results showed that the mean contents of Zn,Fe,Mn were below the national average, while the mean contents of Cu ,Ni ,Co were over the national average, the six trace elements were all with moderate variability levels, and also obeyed the normal distribution; Best theoretical semivariogram models of trace elements were the Gaussian model for Cu and Ni, the spherical model for Zn,Fe and Mn, and the exponential model for Co; The contents of Cu ,Zn ,Ni ,Fe and Co in soil had moderate spatial correlation, the content of Mn had a strong spatial correlation; The variation range of the six trace elements contents followed the order Cu,Zn,Mn 〉 Fe 〉 Co 〉 Ni; The spatial distribution of Cu, Zn, Fe, Mn contents were similar, i. e. , a decreasing trend was found from southeast to northwest, the contents of Ni ,Co presented patchy distribution. In addition, the content of Mn in the study area was mainly affected by natural factors, the contents of other trace elements were affected by natural and artificial factors.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2013年第5期190-195,共6页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金(51178209
91025015)资助
关键词
黑河中游
绿洲农田土壤
微量元素
空间变异
空间分布
the middle reaches of Heihe River
oasis cropland soil
trace elements
spatial variability
spatial distribution
