南阳盆地土壤酸化风险防控分区研究
Zonal Prevention and Control of Soil Acidification Risk in the Nanyang Basin
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摘要: 南阳盆地表层土壤酸化趋势明显。利用土地质量地球化学和地下水污染调查结果，从自然地理条件、土壤条件和水文地质条件3个方面，选择地貌类型、土地利用类型、土壤类型、土壤pH、包气带岩性、含水层富水性、地下水硝酸盐含量和年降水量8个指标作为研究区土壤酸化评价因子，构建土壤酸化风险评价指标体系，分析各指标空间分布特征。采用层次分析法（AHP）确定指标权重，计算土壤酸化风险防控指数。利用GIS空间叠加分析功能对南阳盆地表层土壤进行酸化风险防控区划，结果显示，中高风险和高风险地区分别占总面积35.13%和12.97%。本研究对于丰富土壤环境风险评估手段具有重要意义。Abstract: The acidification trend of surface soil in the Nanyang Basin is obvious. According to the results of geochemical and groundwater pollution survey in this basin, the soil acidification status of the investigation area was assessed in three aspects including natural geographical conditions, soil conditions and hydrogeological conditions. Eight indicators including geomorphology type, land use type, soil type, soil pH, vadose lithology, water-richness of aquifer, nitrate content in groundwater and annual rainfall were used in the assessment. The evaluation index system of soil acidification risk was established. These indices were also used to present spatial distribution characteristics in the corresponding zoning. The weight of each index was determined by the analytical hierarchy process (AHP), and the soil acidification risk prevention and control index was calculated. Surface soil acidification risk prevention and control zoning in the Nanyang Basin was carried out by using GIS spatial overlay analysis function. The results showed that medium-high risk and high-risk areas accounted for 35.13% and 12.97% of the total area, respectively. This study is of great significance to enrich tools for the soil environmental risk assessment.
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Key words:
- soil acidification /
- Nanyang Basin /
- index system /
- analytical hierarchy process
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