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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。
Daan City, Jilin Province, is located in the hinterland of Songnen Plain. In recent decades, the soil in the area has been degraded and impoverished, seriously restricting the development of agriculture and animal husbandry. While carrying out researches on salinization and desertification in Songnen Plain, the author also conducted soil environment survey and soil sampling and testing in Daan City. Soil organic matter, total nitrogen, total phosphorus, total potassium, available nitrogen, available phosphorus and available potassium were selected to evaluate seven soil nutrients, and a metamodel was constructed to evaluate soil nutrients. The outstanding advantage of this method is that not only the overall evaluation of soil nutrients can be carried out, but also individual nutrient factors can be evaluated separately to clarify the contribution of each factor to soil nutrients. After testing, the evaluation results have numerical accuracy and spatial distribution consistency. Matter element analysis is a better method for evaluating soil nutrients in the region. At the end of the article, the principle and application of the method are further discussed.