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土壤肥力因素的时空变异规律是评价土壤肥力高低的重要指标,也是指导配方施肥的重要依据。在土壤肥力空间数据库的支持下,利用地理信息系统技术的自然邻域插值算法,对农安县开安镇2008~2010年连续3年里的精准施肥后土壤养分的空间变异情况进行研究。结果表明,精准施肥后该镇土壤碱解氮的空间变异图发生了明显变化。2008~2010年,土壤碱解氮的差值分别降为108 mg/kg、87 mg/kg和75 mg/kg,而土壤碱解氮含量在110~140 mg/kg区间的面积比重则逐年增大,表明土壤肥力差异性逐渐变小。为提高土壤肥力评价的科学性和客观性探明了一条有效途径。
Spatial and temporal variability of soil fertility factors is an important indicator to evaluate the level of soil fertility, but also an important basis for guiding the formula fertilization. With the support of the soil fertility spatial database, spatial variability of soil nutrients after precision fertilization for three consecutive years from 2008 to 2010 in Ka’an, Nong’an was studied using the natural neighborhood interpolation algorithm based on GIS technology. The results showed that after precision fertilization, the spatial variability of soil available nitrogen in soil changed obviously. From 2008 to 2010, the difference of soil available nitrogen was reduced to 108 mg / kg, 87 mg / kg and 75 mg / kg, respectively, while the proportion of soil available nitrogen in the range of 110-140 mg / kg increased year by year Large, indicating that the difference of soil fertility gradually diminishes. An effective way to improve the scientific and objectivity of soil fertility assessment is explored.