靖西市植烟土壤有机质含量的时空变异特征

Temporal and Spatial Variability of Soil Organic Matter Content in Jingxi Tobacco Growing Area

为了解靖西市植烟土壤有机质含量时空变异特征,分析了土壤有机质含量状况、年际间变化、空间变异特征及与土壤养分、烟稻轮作年限的关系。结果表明:①2006年、2012年、2017年靖西市烟区植烟土壤有机质含量总体上属偏高和丰富水平,平均值分别为35.72、35.80和38.84 g/kg,无处于“缺乏”状态的植烟土壤样本,“偏低”的植烟土壤样本2012年仅为5.30%。地统计学表明,总体呈现偏高和丰富以上色斑。②植烟土壤有机质含量有随着时间推移,均值增加的趋势,2017年度植烟土壤有机质含量显著高于2006年度和2012年度。③2017年度植烟土壤有机质与对应的其他土壤养分因子的回归分析和灰色关联度分析均显示,全氮、碱解氮和有机质的相关性较高,且存在植烟土壤全氮、碱解氮含量随着土壤有机质含量增高而增加的趋势。

The temporal and spatial variation characteristics of soil organic matter(SOM)content in tobacco planting fields in Jingxi and their relationship with soil nutrient contents and tobacco-rice rotation years were analyzed.The results showed that:1)SOM contents in 2006,2012 and 2017 were all generally high and rich,with the mean value of 35.72,35.80 and 38.84 g/kg,respectively.There were no deficient level soil samples,and the low-level soil samples in 2012 were only 5.30%.Geostatistics showed that the overall appearance was high and the above spots were more abundant.2)SOM content increased with time,and SOM content in 2017 was significantly higher than those in 2006 and 2012.3)Regression analysis between SOM and other soil nutrients in 2017 showed that total nitrogen,hydrolyzable alkali nitrogen had higher positive correlation with SOM,and the coefficient of determination was above 0.5000.