南丹县土壤pH与主要养分的时空变异分析

以南丹县植烟区为研究区,运用地统计学方法研究了2003和2013年土壤pH、主要养分含量时空变异特征及时间稳定性变化,为该地区植烟土壤施肥和管理提供理论依据。研究表明,2个时期土壤有机质、速效氮、速效钾含量的变化呈下降的趋势,土壤pH、速效磷含量呈增加趋势。土壤pH、速效钾、有机质的结构性变异趋向增强,随机性变异趋向减弱;在时间分布上,土壤有机质、速效氮含量属中等变异强度;pH变异强度较小;速效磷和速效钾变异范围处于48.59%～74.22%,变异系数较大。这种空间分布在时间上的不均匀性,可能与研究区施肥、耕作措施、土质分布有关。

Study on Spatio-temporal Variation of Soil pH and Main Nutrient in Nandan County

Taking the tobacco plant field in Nandan as an example,geostatistics was applied to analyze the spatial-temporal variability and spatial-emporal variability of soil pH and the main nutrient in 2003 and 2013,so as to provide a theoretical basis of soil fertilization and management for the area of tobacco plant.The results showed that changes in the 2 period of soil organic matter,available N,available K content decreased,soil pH,available phosphorus increased.The structural variability of soil pH,available potassium,organic matter tend to increase,random variation trends to decrease;the time distribution,soil organic matter,available nitrogen is a moderate variation;variation of pH intensity is small;the phosphorus and potassium variation range is 48.59%-74.22%,variation coefficient is large.The spatial distribution of non-uniformity could be related to fertilization,and tillage,soil distribution in the study area in recent years.