隆回植烟土壤有机质含量及其影响因素空间变异性研究

为揭示隆回县烟区植烟土壤有机质含量分布状况及其影响因素，采用地统计学方法分析该烟区植烟土壤有机质含量分布及与影响其分布的土壤类型、土壤质地、pH等因素。结果表明：（1）隆回县烟区植烟土壤有机质含量较高，变幅为5.37~84.64 g/kg，变异系数为28.09%，处于适宜范围内的样本占21.09%，空间分布上呈现从北向南增加趋势。（2）不同乡镇之间的植烟土壤有机质含量差异达极显著水平，6个主产乡镇植烟土壤有机质含量属较高水平，且处于中等及低变异。（3）不同植烟类型土壤的有机质含量差异达极显著水平，红壤和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属较高水平。（4）不同土壤质地的植烟土壤有机质含量差异达显著水平，烟区植烟土壤有机质含量平均在32.03~34.21 g/kg。（5）不同pH的植烟土壤有机质含量差异极显著，随pH升高而升高的趋势，且pH＞7.0的植烟土壤有机质含量较高。

Study on Spatial Variability of Organic Matter Content and Impact Factors in Tobacco Soil of Longhui

In order to reveal the distribution of organic matter contents in tobacco growing soils and its influencing factors in Longhui, spatial distribution of organic matter contents, and the distribution influential factors, such as soil type, soil texture, pH and so on, were analyzed. Results showed as follows: (1) organic matter contents in the tobacco soil were higher for tobacco cultivation with amplitude of 5.37-86.46 g/kg and variation coefficient of 28.09%, organic matter contents of about 21.09% of the soil samples were fit for tobacco cultivation; (2) significant differences were found among the different villages and towns for the contents of organic matter, the soil organic matter contents in the 6 main tobacco planting villages and towns were higher, and of medium variability and low variability; (3) significant differences were found among the different soil types, the contents of organic matter from red soil and yellow soil had a suitable level, and other types of soil had a higher contents of organic matter; (4) significant differences were found among the different soil texture, the average organic matter content in the tobacco soil was 32.03-34.21 g/kg; (5) significant differences were found among the different soil pH, the organic matter contents increased with the rise of the pH value, and the organic matter contents was higher in soil which had pH＞7.0 in Longhui.