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采用几何轮廓相似度模型,分别对彰武县境内柳河流域所辖乡村1985年与2009年土壤肥力等级进行判别.结果表明:研究区所辖43个乡村土壤肥力普遍处于中下等水平;与1985年相比,2009年有15个乡村土壤肥力级别降低即土壤肥力变差,9个乡村土壤肥力级别升高即土壤肥力变好,19个乡村土壤肥力级别未发生变化.该模型可在缺乏多标度数据分布信息或小样本条件下难以估计统计特征的应用问题中,通过分析多标度数据的几何特征对数据进行判别;且模型采用了凹函数求平均值,从而减小了一些突变型数据对判别的干扰.因此,采用几何轮廓相似度模型判别土壤肥力时空变异性准确且简便可行.
The geometric contour similarity model was used to distinguish the soil fertility levels of villages under the jurisdiction of Liu River valley in 1985 and 2009 in Zhangwu County.The results showed that the soil fertility of 43 villages under the jurisdiction of the study area was generally at the lower and middle levels, In 2009, 15 soil fertility levels decreased in 15 villages, that is, soil fertility deteriorated in 2009, soil fertility in 9 villages became higher, and soil fertility levels in 19 villages did not change. Scale data distribution information or small sample conditions difficult to estimate the statistical characteristics of the application problems, by analyzing the geometric features of multi-scale data to determine the data; and the model using the concave function to find the average, thus reducing some of the mutant Therefore, the spatial-temporal variability of soil fertility using geometric contour similarity model is accurate and simple and feasible.