基于GIS的耕地土壤养分贫瘠化评价及其障碍因子分析

论文在山东省禹城市开展的系统土壤调查采样和室内化验分析获得的土壤养分各要素数据信息基础上,在GIS技术支持下,综合利用采样点养分要素和空间信息数据,通过建立土壤"阈值样点"、利用层次分析法(AHP)等方法改进灰色关联等级评价模型,实现了土壤养分贫瘠化评价定量化,引入障碍因子诊断模型对引起禹城市土壤养分贫瘠化的因子进行障碍诊断。评价利用Kriging空间插值技术获取了研究区土壤贫瘠化状况、主要障碍因子的空间分布信息,与实地调查分析结果相符,表明运用该技术方法对土壤贫瘠化评价和障碍因子诊断的可行性和科学性。该法开展的贫瘠化状况评价和障碍因子诊断对土壤资源的科学管理和可持续利用具有积极意义,并可为研究区提升土壤质量提供科学参考。

GIS-based Evaluation of Soil Nutrient Depletion and Analysis of Its Limiting Factors in Yucheng City

Taking Yucheng City, Northeast district of Shandong Province, as our study area, this paper intended to develop quantitative methods for soil nutrient depletion evaluation and to target its limiting factors. Based on the extensive information obtained by field-survey, soil sampling and lab analysis, the quantitative evaluation procedure and diagnosis of soil nutrient depletion limiting factors was realized by adopting the improved Grey Relation Model, the Model of limiting factors diagnosis and supported by GIS techniques. The Grey Relation Model was improved by utilizing Analytical Hierarchy Program and"Threshold Samples". The level of diagnosis of soil nutrient depletion, limiting factors and their spatial distribution information were acquired by Kriging interpolation, and the results were consistent with local conditions according to field-survey and lab analysis. The approach was feasible and effective in soil nutrient depletion, limiting factors diagnosis. This research contributes significantly to scientific management and sustainable use of soil nutrient depletion, limiting factors diagnosis and provides consults to improve soil quality.