邵阳市植烟土壤速效钾含量分布特征研究

为了解邵阳市植烟土壤速效钾含量分布状况,测试了邵阳市1790个土壤样本的速效钾含量,采用经典统计学和地统计学方法分析了邵阳市植烟土壤速效钾含量及在县域、空间、pH组、有机质组的分布。结果表明：①邵阳市植烟土壤速效钾含量总体上处于偏低水平,平均值为113.75 mg/kg,变异系数为50.40%,处于适宜范围内的样本占12.01%；于邵阳县和新宁县植烟土壤速效钾含量极显著高于隆回县；③植烟土壤速效钾含量总体上呈斑块状分布态势,以植烟土壤速效钾含量100.00~130.00 mg/kg为主要分布面积；榆不同pH组的植烟土壤速效钾含量差异不显著；虞植烟土壤有机质含量在35 g/kg以下时,土壤速效钾含量有随有机质增加而增加的趋势；植烟土壤有机质含量在35 g/kg以上时,土壤速效钾含量有随有机质增加而减少的趋势。

Distribution of Available Tobacco - growing Potassium Contents in Soil in Shaoyang

In order to find out the status of available K contents in tobacco-growing soils in Shaoyang, using classical sta-tistics and geostatistical methods, this paper analyzed the distribution of available K contents in different county, pH group, organic matter group and spatial distribution after measuring 1 790 soil samples. The results were as follows：（1） The available K contents in Shaoyang tobacco-growing soil was low on the whole,with a mean of 113.75 mg/kg and vari-ation coefficient of 50.40%, and only 12.01% or so of the soil samples had available K contents for tobacco cultivation.（2）The available K contents of tobacco-growing soils in Xinning county and Shaoyang county were extremely significant more than that of Longhui county.（3） Kriging interpolation map indicated that the spatial distribution of available K was patchiness, and the available K contents of most of the tobacco-growing areas was 100.00~130.00 mg/kg.（4） There was no-significant difference of available K content in tobacco-growing soils among different pH group.（5）The availa-ble K contents increased with the rise of the organic matter content when the organic matter content in soil was less than 35 g/kg, while decreased with the rise of organic matter content of when the organic matter content in soil was more than 35 g/kg.