双流县土壤碱解氮·有效磷·速效钾含量时空变异特征

[目的]为加强土壤养分管理和改善施肥体系提供参考。[方法]利用地统计学与GIS相结合的统计分析方法,探讨双流县土壤碱解氮、有效磷和速效钾含量的时空演变。[结果]1982年双流县土壤碱解氮、有效磷和速效钾含量空间分布比较零乱,分类等级较多,区域性差异较大。2007年双流县土壤碱解氮、有效磷、速效钾含量空间分布较均匀,区域性差异较小,与1982年相比更为简单。2007年双流县土壤碱解氮和速效钾含量与1982年相比呈现降低的趋势;有效磷含量较1982年总体上略有升高,但仍以中等或缺乏为主。[结论]在农业生产中,对氮肥和钾肥的使用量不够,应提倡增施氮肥和钾肥,注意平衡施用磷肥。

Spatial-Temporal Variability Characteristic of Contents of Soil Available N, P and K in Shuangliu County

[Objective] The research aimed to provide thd reference for the strengthening of soil nutrient management and the improvement of fertilization system.[Method]Geostatistics and GIS statistical analysis methods were used to investigate the characteristic of spatial-temporal variability of available nitrogen(AN),available phosphorus(AP) and available potassium(AK) in Shuangliu County.[Result]The distribution of AN,AP and AK in Shuangliu County in 1982 were messy.There were more classification level and large regional differences.The distribution of AN,AP and AK in 2007 were more uniform,and regional differences were smaller compared with 1982.AN and AK contents in 2007 showed a decreasing trend compared with 1982.AP content increased slightly,but still showed the lack of phosphorus.[Conclusion] The use of nitrogenous fertilizer and potassic fertilizer were less,which should be promoted in agricultural production.Moreover,more attention should be paid to balanced application of phosphate fertilizer.