【摘要】 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。更多还原

【Abstract】 Geographical information system(GIS) combined with,Geostatistics was applied to reveal the spatio-temporal variability of soil nutrients i.e.,organic matter,available N available P and available K in Gongzhuling area of Jilin province during twenty years.The results showed that the average content of organic matter,available N available K decreased except for available P.The great difference of nutrients is available P and the less differences are organic matter,available K and available N in 2000.The great difference was available P;the less differences were available N,available K and organic matter in 1980.The reason was mainly contributed to the application of fertilizers and the people management.更多还原