基于格网GIS的重点生态功能区生态系统敏感性研究:以贵州省雷山县为例

为了科学地诊断出存在的环境问题,实现对生态环境的保护,以重点生态功能区雷山县为例,结合地形、地貌与气候等数据,以格网为评价单元,构建生态系统敏感性评价指标体系。采用层次分析法、区域综合法及格网GIS技术,对评价体系中各指标进行10 m×10 m尺度下的格网化表达,运用栅格数据的空间叠加方法及生态系统敏感性评价模型,综合评价雷山县生态系统敏感性空间格局。结果表明:雷山县生态系统敏感性较高,其中非敏感区和轻度敏感区面积较小,仅占总面积的5%和13.4%;其次是中度敏感区和极度敏感区,分别占总面积的26.3%和17%;高度敏感区面积最大,占总面积的38.3%。

ENVIRONMENTAL SITE INVESTIGATION AND HEALTH RISK ASSESSMENT FOR A CHROMIUM CONTAMINATED SITES IN SHIJIAZHUANG

The environmental site investigation and risk assessment were performed for a chromium contaminated soil in Jingxing County,Shijiazhuang,according to Technical Guidelines for Risk Assessment of Contaminated Sites (HJ 25.3-2014).The results showed that the main pollution area of this area focused on the chromium slag yard,leaching workshop and workshop,which belonged to the heavily polluted area.And the highest total chromium concentrations and hexavalent chromium concentrations of the soil in the chromium contaminated sites was 69 500,68 300 mg/kg,respectively.Therefore the site remediation should be conducted to protect human health.Based on the pollution status of different sites,chromium contaminated soils of high and low concentrations were suggested to be remediated by chemical leaching method and reductionsolidification/stabilization method for removing chromium,respectively.