基于熵权的土壤养分地球化学多级模糊综合评判——以陕西省关中地区为例
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中国地质调查局基础地质调查项目“西北五省耕地区1:25万土地质量地球化学调查”(DD20160319)


Multi-level Fuzzy Comprehensive Evaluation of Soil Nutrient Geochemistry Based on Entropy Weight—Taking Guanzhong Region of Shaanxi Province as an Example
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    摘要:

    [目的] 研究陕西省关中地区的土壤养分地球化学综合等级,为该区土地质量、生态管理以及土地资源的合理利用提供科学依据。[方法] 利用土地质量地球化学调查中的大量、中量、微量元素等12种指标,构建基于熵权的多级模糊综合评判模型,使用熵理论确定权重,模糊评价等级,分层次多级评判,最大限度地区分了关中地区各评价指标的差异,综合、客观地进行评价养分等级。[结果] 大量养分1和2等级比例占2.0%,中量养分1和2等级比例约占30.31%,微量养分1和2等级比例约占66.42%,土壤养分地球化学综合1和2等级土地所占比例为33.52%;河谷区域中的大量、中量、微量养分均较低;渭北台塬中量、微量养分丰富,大量养分较缺乏;中低山区大量、中量、微量养分均丰富;秦岭北缘微量元素丰富,大量养分元素处于中等水平,而中量元素较缺乏。[结论] 关中地区大量养分缺乏,中量和微量养分充足,综合等级以2,3和4等级为主,但空间变异较大,需要整体施用富含大量养分元素肥料,同时针对不同景观区的养分短板,合理补充中量、微量元素肥料,以提高关中地区的土壤生产力。

    Abstract:

    [Objective] The comprehensive evaluation of soil nutrient geochemistry in Guanzhong region of Shaanxi Province was studied, to provide scientific basis for land quality, ecological management and rational utilization of land resources.[Methods] Based on 12 evaluation indexes such as mass nutrients, medium nutrients, and trace nutrients in the geochemical survey of land quality, a multi-level fuzzy comprehensive evaluation model based on entropy weight was constructed. The entropy theory was used to determine the weight. The grades were vaguely evaluated by multiple levels, to divide the differences among the evaluation indicators in Guanzhong area.[Results] The proportion of first and second class of mass nutrients accounted for 2.0%. The proportion of first and second class of medium nutrients accounted for 30.31%. The proportion of first and second class of trace nutrient accounted for 66.42%. The proportion of first and second class of soil nutrient geochemistry accounted for 33.52%. The mass nutrients, medium nutrients, and trace nutrients were all lack in the valley area. The medium nutrients and trace nutrients were rich in Weibei plateau, but the mass nutrients was lack. The mass nutrients, medium nutrients, and trace nutrients were rich in the middle and low mountains. The trace nutrients was rich in the northern edge of the Qinling Mountains, and the mass nutrients were at a moderate level, while the trace nutrients were lacking.[Conclusion] The mass nutrients is lacking, while the medium nutrients and trace nutrients are rich in Guanzhong area. The comprehensive evaluation level of soil nutrients is mainly the second, third and fourth level, but the spatial variation is large. To improve the soil productivity in Guanzhong area, it is necessary to apply the fertilizer of mass nutrients as a whole, and at the same time, to apply the medium nutrients and trace nutrients in different landscape areas.

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王鹏,刘拓,段星星,赵禹,梁楠,杨生飞.基于熵权的土壤养分地球化学多级模糊综合评判——以陕西省关中地区为例[J].水土保持通报,2019,39(6):136-141

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  • 收稿日期:2019-04-02
  • 最后修改日期:2019-06-13
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  • 在线发布日期: 2020-01-17
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