基于GIS与空间数据库技术的土壤肥力评价研究

Research on Evaluation of Soil Fertility Based on GIS and Spatial Database Technology

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。

The rules of soil spatial variability in aspect of soil fertility are important indicators to value the soil fertility and they are also important basis to guide precision fertilization. Using Natural Neighbor Algorithm based on the soil fertility space database, the changing of soil nutrients＇ spatial variability in Kaian Town of Nongan County was studied after three consecutive years of precision fertilization in 2008, 2009 and 2010. The results showed that the pictures of soil alkali Nitrogen spatial variability have obviously c 2008 to 2010, soil Nitrogen＇s deviation declined to 108 mg/kg in 2008, 8 hanged after precision fertilization. From 7 mg/kg in 2009, 75 mg/kg in 2010, and the soil Nitrogen content＇ s area proportion between 110mg/kg to 140mg/kg has increased year by year, which indicated that soil fertility＇ s diversity has become smaller. This has discovered a method to improve the science and objectivity in valuing soil fertility.