湘西植烟土壤有机质含量分布及其影响因素

为了解湘西州植烟土壤有机质含量分布状况及其影响因素,测试了湘西州7个主要烟区488个土壤样本的有机质含量,采用传统统计学和地统计学方法分析了湘西州植烟土壤有机质含量分布及土壤类型、海拔高度、pH值等影响因素。结果表明:1湘西州植烟土壤有机质含量总体适宜,平均值为21.69g/kg,变幅为3.12~62.97g/kg,变异系数为40.64%,处于适宜范围内的样本占41.48%;2不同县之间的植烟土壤有机质含量差异达极显著水平,永顺县、凤凰县、龙山县植烟土壤有机质含量总体上处于适宜水平,其他各县总体处于较低水平;3湘西州植烟土壤有机质含量在空间分布上是从东北部、西部和西南部向州中部及东南方向减少,在永顺县东南部、保靖县的西部各有一个高值区;4不同植烟类型土壤的有机质含量差异达显著水平,灰黄棕土、水稻土、灰黄泥、浅灰黄泥、黄壤的有机质含量属适宜水平,其他类型土壤的有机质含量偏低;5不同海拔高度的植烟土壤有机质含量差异达极显著水平,湘西州植烟土壤有机质含量有随海拔升高而升高的趋势;6不同pH的植烟土壤有机质含量差异极显著,主要为pH>7.0的植烟土壤有机质含量较高。

DISTRIBUTION OF ORGANIC MATTER CONTENTS OF TOBACCO-GROWING SOIL AND ITS INFLUENCING FACTORS IN XIANGXI

In order to understand the distribution of organic matter contents in tobacco growing soils and its influencing factors in Xiangxi, spatial distribution and distribution frequency of organic matter contents, county difference soil types difference, altitude difference and pH difference were analyzed by collected 488 soil samples. Results sheowed as follows:(1) organic matter contents in the tobacco soil is generally suitable for tobacco cultivation with a mean of 21.69g/kg, amplitude of 3.12~62.97g/kg and variation coefficient of540.64%. About 41.48% of the soil samples of organic matter contents are fit for tobacco cultivation. (2) Kriging interpolation map indicated that the spatial distributions of organic matter was regularly distribution and reduced from the north-east, western and south-western to the middle and east-south. The high value area of organic matter was in some areas of the east-south Yongshun and the eastern Baojing, respectively. (3) Significant differences were found among the different counties for the contents of organic matter, and the average content of organic matter was generally suitable level in Yongshun, Fenghuang and Longshan, and other counties were lower level. (4) There are extremely significant differences among different soil types for the contents of organic matter, and the average content of organic matter was generally suitable level in yellow-brown ash soil paddy field, yellow ash soil, light yellow ash mud and yellow soil., and other soil types were at lower level. (5) Extremely significant differences were observed among different altitude soil for the contents of organic matter. The organic matter contents was increasing with the rise of altitude in tobacco growing soils of Xiangxi. (6) Significant differences among different pH soil for the contents of organic matter, and the organic matter contents was higher in pH>7.0 of Xiangxi soils.