植烟土壤有效态微量元素空间变异特征

Spatial Variability Characteristics of Soil Available Microelements in Tobacco Field

基于GIS和GPS定位技术,结合网格取样,用地统计学方法研究了褐土烟区土壤有效态微量元素养分(速效Fe、速效Mn、速效Cu、速效Zn)的空间变异规律,并绘制了微量养分空间分布图。结果表明:土壤速效微量养分在整个研究区内均表现出中等变异水平,其变异性大小表现为:速效Zn>速效Mn>速效Cu>速效Fe。除速效Mn外,其他微量元素都表现出很强的空间结构性,速效Cu、Zn变程较短,分别为182m和175m,速效Mn变程较长为850m。基于半方差函数模型,用普通克里格法对研究区土壤速效微量养分进行了克里格插值,结果表明:速效Fe在研究区内普遍缺乏,速效Mn、速效Cu含量中等偏高,而速效Zn含量在整个研究区表现出明显的差异性。

Based on GIS and GPS technology, the geostatistics method was applied to study the spatial variability characteristics of soil available microelements （Cu, Fe, Mn and Zn） in tobacco field. The results showed that spatial variability of soil available microelements were all at moderate levels in the whole research region, and the sequence was in an order of Zn〉Mn〉Cu〉Fe. Except Mn, other microelements all showed very strong spatial structures, Cu and Zn had shorter auto-correlation distances, which were 182 m and 175 m respectively; Mn had relatively longer auto-correlation distance, which was 850 m. Based on semi-variogram, ordinary Kriging method was applied to interpolate soil available microelements in the research region, the results showed that Fe was widely deficient in the research region, the contents of both Mn and Cu were at moderate levels, while the content of Zn showed an apparent discrepancy in the research region.