【摘要】 基于2000和2015年湘西植烟土壤交换性镁数据,分析其基本统计特征和时空分布变化。结果表明,从基本统计特征看,15年间湘西植烟土壤交换性镁均值由1.39 cmol/kg上升到1.77 cmol/kg,同时其变异程度也增大。从时空变异看,15年来,植烟土壤交换性镁"低"和"极地"等级面积增加了4.62百分点和1.18百分点,"高"和"极高"等级面积增加了9.13百分点和9.80百分点,而"适宜"等级的面积下降了24.73百分点。总体上,湘西植烟土壤交换性镁呈增加和两极分化的趋势。更多还原

【Abstract】 Based on the data of exchange magnesium in tobacco planting soil in Xiangxi in 2000 and 2015,the basic statistical characteristics and spatial and temporal distribution changes were analyzed. The results showed that the mean of exchange magnesium in tobacco planting soil in Xiangxi increased from 1.39 cmol/kg to 1.77 cmol/kg in 15 years,and the degree of variation increased. In terms of spatial and temporal variations,over the past 15 years,the " low" and " polar" grade areas of flue-planting soil have increased by 4.62 percentage point and 1.18 percentage point,and the " high" and " very high" grade areas have increased by 9.13 percentage point and 9.80 percentage point,the area of the " suitable" level decreased by 24.73 percentage point. Overall,the trend of increasing and polarization of exchangeable magnesium in tobacco planting soil in Xiangxi.更多还原