湘西烟区植烟土壤氯含量及其影响因素分析

The Chloride Contents of Tobacco-growing Soil and Its Influencing Factors in Xiangxi

为探明湘西州植烟土壤水溶性氯含量分布状况,测试湘西州主要烟区488个土壤样本的水溶性氯含量,采用传统统计学和地统计学方法分析其分布特征以及前茬作物、土壤类型、海拔高度、土壤pH值、土壤有机质等因素对其的影响。结果表明:(1)湘西州植烟土壤水溶性氯含量总体处于适宜水平,平均值为23.81mg/kg,变幅为0.24～59.77mg/kg,变异系数为72.74%,处于适宜范围内的样本占21.14%。(2)植烟土壤水溶性氯含量在空间分布上有从西向东方向递增的分布趋势。(3)不同作物前茬、植烟土壤类型、海拔高度和pH值的植烟土壤水溶性氯含量差异显著或极显著,但不同有机质含量的植烟土壤中水溶性氯含量差异不显著。(4)前茬为烤烟、蔬菜和玉米的土壤水溶性氯含量极显著地低于其他作物前茬。(5)水稻土壤的水溶性氯含量极显著高于石灰土壤类型。(6)植烟土壤水溶性氯含量有随海拔、pH值的升高而降低的趋势。

In order to understand the distribution of water-dissolving chloride contents in tobacco growing soils and its influencing factors in Xiangxi,spatial distribution and distribution frequency of water-dissolving chloride contents,differences of different previous crops,soil types,altitude,soil pH and soil organic matter were analyzed by collected 488 soil samples.The results were as follows：（1）Water-dissolving chloride contents in the tobacco soil was generally suitable for tobacco cultivation with a mean of 23.81 mg/kg,amplitude of 0.24~59.77 mg/kg and variation coefficient of 72.74%.About 21.14% of the soil samples of water-dissolving chloride contents was suitable for tobacco cultivation.（2）IDW interpolation map indicated that the spatial distributions of water-dissolving chloride were regularly distribution and increasing from the west to the east.（3）There were significant differences or extremely significant differences among the different previous crop,different soil types,different altitude soil and different soil pH for the contents of water-dissolving chloride,but there was not difference among different soil organic matter.（4）The water-dissolving chloride contents of soil following flue-cured tobacco,vegetable and corn crop were lower than the others.（5）The average content of water-dissolving chloride content in paddy soil was higher than that in the lime soil.（6）The water-dissolving chloride contents reduced with the rise of altitude and the rise of pH.