湘西植烟土壤交换性钙含量及空间分布研究

Spatial Distribution and Available Calcium Contents of Tobacco-growing Soil in Xiangxi

[目的]了解湘西州植烟土壤交换性钙含量分布状况。[方法]测定湘西州主要烟区488个土壤样本的交换性钙含量,采用传统统计学和地统计学方法分析湘西州植烟土壤交换性钙含量适宜样本分布、县域差异、土壤类型差异、海拔差异及空间分布。[结果]湘西州植烟土壤交换性钙含量丰富,平均值为1 688.01 mg/kg,处于适宜范围内的样本占20.29%。不同县之间的植烟土壤交换性钙含量差异达0.01显著水平,保靖县、芦溪县相对较高,古丈县、凤凰县相对较低。不同植烟土壤类型的交换性钙含量差异达0.05显著水平,红壤、黄壤和灰黄土的交换性钙含量相对较高,浅灰黄泥的交换性钙含量相对较低。不同海拔高度的植烟土壤交换性钙含量差异不显著。植烟土壤交换性钙含量Kriging插值图显示,湘西州植烟土壤交换性钙含量呈有规律地分布,在龙山县北部、永顺县东部、保靖县西部、芦溪县南部各有一个高值区,在永顺县北部、古丈县中部、凤凰县西北部各有一个低值区。[结论]湘西州植烟土壤交换性钙含量丰富,但不同地块间土壤钙含量存在差异。

[ Objective ] The research aimed to study the distribution of available calcium contents in tobacco growing soils of Xiangxi. [ Method ]488 soil samples were collected to analyze the distribution frequency of available calcium contents, the difference of different county, the difference of different soil types, the difference of different altitude and spatial distribution of available calcium contents. [ Result] The availa- ble calcium contents in the tobacco soil was abundant for tobacco cultivation,with a mean of 1688.01mg/kg. About 20.29% of the soil sam- ples had available calcium contents for suitable tobacco cultivation. There were extremely significant differences among different counties for the contents of exchangeable calcium. The average content of exchangeable calcium was relatively high in Baojing and Luxi. The average con- tent of exchangeable calcium was relatively low in Guzhang and Fenghuang. There was significant differences among different soil types for the contents of exchangeable calcium. The average content of exchangeable calcium was relatively high in red soils, yellow soils and yellow ash soil. The average content of exchangeable calcium was relatively low in light yellow ash mud. There were no significant differences among dif- ferent altitude soil for the contents of exchangeable calcium. Kriging interpolation map indicated that the spatial distributions of exchangeable calcium were regular. The high value area of exchangeable calcium were in some areas of the northern Longshan, the eastern Yongshun, the western Baojing and the southern Luxi, respectively. The low value area of exchangeable calcium was in some areas of the northern Yongshun, the central Guzhang and the northeastern Fenghuang, respectively. [ Conclusion] The available calcium contents of the tobacco soil is abun- dant for tobacco cultivation in Xiangxi, but the soil available calcium contents have difference among different test field.