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运用地理信息系统和地统计学相结合的方法研究了20年来吉林省公主岭地区土壤主要养分指标—有机质、速效氮、速效磷、速效钾的时空变异规律。结果表明,20年来除了速效磷含量增加外,有机质、速效氮、速效钾含量都有所降低。2000年速效磷的变异最大,其次是有机质、速效钾、速效氮;1980年变异最大的是速效磷,其次是速效氮、速效钾、有机质。这主要是人为管理及施肥差异造成的。
Using the combination of GIS and geostatistics, the spatial and temporal variation of soil organic matter, available nitrogen, available phosphorus and available potassium in Gongzhuling area of Jilin Province in the past 20 years were studied. The results showed that the contents of organic matter, available nitrogen and available potassium all decreased after 20 years in addition to the increase of available phosphorus. In 2000, available phosphorus had the largest variation, followed by organic matter, available potassium and available nitrogen. In 1980, the highest variation was available phosphorus, followed by available nitrogen, available potassium and organic matter. This is mainly caused by man-made management and differences in fertilization.