太仓市耕层土壤碱解氮空间变异分析

Spatial Variation of Alkali-hydrolysable Nitrogen of Paddy Soil in Taicang

[目的]为明确太仓市耕层土壤氮素含量及分布状况。[方法]采用地统计学分析方法,分析了土壤碱解氮现状及空间变化。[结果]2006年土壤碱解氮平均值为131.57±3.01 mg/kg,比20世纪80年代的碱解氮水平增加约31%;从变异程度来看,属中等变异强度;从空间分布来看,全市土壤碱解氮属于弱空间相关性,人为因子(施肥、耕作措施、种植制度等)的影响占主导地位。[结论]该研究对于帮助农户合理施肥、提高土壤质量、保护生态环境非常有效。

[ Objective] The research aimed to define the alkaline hydrolyze N （A-N） content in arable layer soil and the distribution of Taicang. [ Method] Using statistical analysis method, the current situation and space change of A-N in soil were analyzed. [ Result] Geostatis Ties analysis showed that in the past years A-N increased. The average value of A-N in 2006 was 131.57 ＋_ 3.01 mg/kg. Compared with the year of 2006, the growth rate was obvious with 31% growth. A-N was unconspicuous spatial heterogeneity, mainly affected by random factors, such as fertilization, cultivation, land utilization type, and so on. [ Conclusion ] This analysis is very useful to help farmers use fertilizer prop-erly, improve soil quality and protect ecological environment.