区域土地利用生态风险评价——以贵港市辖区为例

Ecological Risk Assessment of Regional Land Use:A Case Study of Guigang City

为研究区域土地利用对生态环境造成的影响,以贵港市辖区各乡镇(街道办)作为评价单元,引用区域综合生态风险评价模型,从多风险源、多风险受体、多风险效应3个方面对贵港市辖区2015年土地利用生态风险变化进行了评价。结果表明:高生态风险区主要分布在贵港市辖区中心城区及周边人口密集、经济发展较快的地区,该类地区风险三要素有2个或以上居高;低生态风险区主要分布在远离城市的人口密度小、人为活动干扰小、经济发展缓慢的地区。

In order to study the impact of regional land use on the ecological environment,we used all villages and towns(subdistrict offices)of Guigang city as the evaluation units,and used the regional comprehensive ecological risk assessment model to evaluate the ecological risk of land use in Guigang city in 2015 from the aspects of multi-risk source,multi-risk receptor and multi-risk effect.The research results were obtained as follows:the area of high ecological risk was mainly distributed in the downtown district and its peripheral districts with dense population and rapid economic development of Guigang city,and 2~3 factors of 3 risk factors were higher in these districts;the low ecological risk area was mainly distributed in the districts far from the city,with small population density,little human activity and slow economic development;the area of lower and low ecological risk accounted for 48.15%of total area of Guigang city,indicating the potential of ecological risk reduction was very great.