滇西南勐永蔗区土壤肥力的综合评价

Integrated Evaluation of Soil Fertility of Mengyong Sugarcane Area in Southwest Yunnan

以滇西南勐永蔗区185份土壤样本为研究对象,采用主成分分析法、隶属度函数和模糊数学法,对蔗区土壤肥力进行综合评价。结果表明:(1)勐永蔗区土壤p H值和有机质、全钾、速效钾、有效磷含量适宜,全氮含量偏高,全磷、碱解氮含量偏低;(2)p H和有机质、全氮、全磷、全钾、碱解氮、速效钾含量的空间变异较小,有效磷含量的空间变异较大;(3)勐永蔗区土壤肥力平均综合指标值0.53,中等水平及以上的占92.3%,说明该蔗区土壤肥力状况总体良好。

Integrated evaluation of soil fertility of sugarcane area was carry out with 1 85 soil samples from Mengyong in southwest Yunnan by principal component analysis,subordinating degree function and fuzzy mathematics. The results showed that （1 ）The pH and content of organic matter,total K,rapidly available K and available P were appropriate,while total N content was higher,and content of total P and available N were lower in Mengyong sugarcane area. （2）The spatial variability of pH,organic matter,total N,total P,total K,available N and rapidly available K was little,while that of availa-ble P was greater. （3）Average integrated index of soil fertility in Mengyong sugarcane area was 0.53,in which samples with imiddle or high level accounted for 92.3%,which showed that the soil fertility situation in Mengyong sugarcane area was good as a whole.