物元模型在玉树地区林地土壤养分评价中的应用

选择玉树区林地土壤有机质,全氮,全磷,全钾,速效氮,速效磷和速效钾7项测试数据作为土壤养分评价指标,采用偏相关分析法确定权重,应用物元分析建模对玉树地区林地土壤养分进行评价。结果表明玉树地区整体林地土壤养分状况良好,除速效磷含量极贫乏外,其余养分指标含量均达到丰富水平;有机质、氮素和速效磷是影响土壤养分的主要因子。建议平衡地区土壤养分状况,优先考虑提高速效磷养分水平。

Application of Matter-element Model in Evaluation of Forest Soil Nutrients in Yushu Area

Soil organic matter, total nitrogen, total phosphorus, total potassium, available nitrogen, available phosphorus and available potassium were chosen as the indexes, partial correlation analysis was used to determine the weights of the seven indexes, and then matter-element analysis model was applied to evaluate forest soil nutrients of Yushu. The results indicated that the situation of forest soil nutrients was favorable on the whole; except available phosphorus, the contents of other indicators were all reached abundant level, and the soil organic, nitrogen and available phosphorus were the main factors for soil nutrients. Improving soil nutrient balance was suggested, particularly to available phosphorus.