物元模型在区域土壤养分评价中的应用

Matter-element Model in the Regional Soil Nutrient Evaluation Application

吉林省大安市位于松嫩平原腹地,近几十年来该区土壤退化、贫瘠化,严重制约农牧业发展。作者在进行松嫩平原土地盐碱化、荒漠化研究的同时,还对大安市进行了土壤环境调查和土壤采样、测试。筛选出有机质、全氮、全磷、全钾、有效氮、速效磷和速效钾7项土壤养分评价指标,构建物元模型,进行土壤养分评价。该方法的突出优点是不仅可以对土壤养分进行总体评价,而且还可以对各养分因子进行单独评价,以阐明各因子对土壤养分的贡献率。经检验,评价结果具有数值上的准确性和空间分布上的一致性。物元分析是一种较好的评价方法,适于进行区域土壤养分评价研究。文章最后对该方法的原理和应用作了进一步的讨论。

Da＇an of Jitin Province is in the heart of the Songnen Plain. During the recent decades, the soil in this region was in degradation and leanness, which hampering the development of agriculture and animal husbandry seriously. Authors carried on investigation about the land salinization and desertification in the Songnen Plain. At the same time, soil environmental qualities were investigated and soil samples were collected and tested in Da＇an City. Organic matter, total N, total P, total K, available N, available P and available K were chosen as the evaluation indices. The regional soil nutrient evaluation model was constructed with the support of matter-element model. The outstanding merits of this method are： that it could make an overall evaluation of soil nutrient, and the various nutrient factors could be evaluated separately to clarify the contribution rate to soil nutrient. Upon examination, the result has numerical accuracy and spatial distribution consistency. Matter-element analysis is a better evaluation methods, which is suitable for regional evaluation of soil nutrient.In the last, the paper took the further discussion about the principle and application of this method.