河南省土壤有效锌质量分数时空变异分析

为了分析河南省土壤养分变化，为河南省土壤施肥提供参考，运用GIS与地统计学相结合的方法，通过对比分析1982、2009年2个不同时期河南省土壤有效锌的含量，探讨20多年以来河南省土壤有效锌时空变异的规律。结果表明：2009年河南省有效锌质量分数比1982年增加了41.67%，2个时期土壤有效锌变异系数分别为29.1%和37.3%，变异程度均为中等变异，最优拟合模型为球状模型，具有中等的空间相关性。20多年来，河南省土壤有效锌含量只有北部地区呈减少趋势，其余地区大体呈现出不同程度的增加趋势，其中漯河市、驻马店市、信阳市增幅较大，焦作市、开封市减少较多，在农作物施肥、土壤管理等过程中，应及时控制有效锌元素含量的合理范围。

Spatial-temporal Variation of Mass Fraction of Soil Effective Zinc in Henan Province

In order to analyze the soil nutrient change of Henan Province and provide reference for fertilizer application, spatial-temporal variation of mass fraction of soil effective zinc of 2 periods (1982 and 2009) were studied with the methods of GIS and geostatistics. The results showed that: the percentage of effective zinc in Henan Province increased by 41.67% from 1982 to 2009, the variable coefficient of effective zinc was 29.1% and 37.3%, respectively, in the two periods, which belonged to medium class; the optimal fitting model was spherical model, which had medium spatial correlation. For more than 20 years, the content of the effective zinc showed a decrease trend only in the north of Henan Province, and it showed an increase trend in different degrees in other regions, the growing rates of Luohe, Zhumadian and Xinyang were great, and the decreasing rates of Jiaozuo and Kaifeng were obvious. In the process of fertilizer application and soil management, the reasonable range of effective zinc should be controlled.