热带滨海干旱地区生态环境脆弱性定量评价——以雷州半岛为例

雷州半岛是我国南方的热带滨海干旱地区,位于海陆气三相物质交接带,生态环境极度不稳定。借鉴生态环境脆弱性的定量评价方法,选择年降水量、降水变率、台风暴雨频率等10项指标,评价雷州半岛各县市的生态环境脆弱性。研究结果显示,雷州半岛南部生态环境的脆弱性高于北部。南部的徐闻县属严重脆弱区,生态环境脆弱度为0.9857;中南部的雷州市属强度脆弱区,生态环境脆弱度为0.8511;北部的廉江市、吴川市属中度脆弱区,生态环境脆弱度分别为0.6770和0.7679;中部的湛江市区和遂溪县属轻度脆弱区,生态环境脆弱度分别为0.3423和0.4346。

Quantitatively Assessment of Eco-environmental Vulnerability in Tropic Coastal Arid Area: A Case Study of Leizhou Peninsula

Leizhou Peninsula is in tropic coastal arid area in South China. It is located in a belt of Sea-Land-Air interactions, where the eco-environment is extremely unstable. The paper, using the quantitatively assessment method for eco-environmental vulnerability as a reference, chose the following 10 indices to analyze the regional eco-environmental vulnerability in Leizhou Peninsula: annual rainfall, variance of rainfall, rainstorm frequency from typhoon, cold disaster frequency, vegetation coverage ratio, waste water discharge per unit area, seawater breeding aquatics density, arable land area per capita, GDP per capita, and eco-environmental vulnerability. The result showed that the eco-environmental vulnerability in Leizhou Peninsula decreases from south to north. In detail, Xuwen County in the south belongs to the extremely fragile region, the eco-environmental vulnerability degree is 0.9857; Leizhou City in the mid-south belongs to the severely fragile region, the eco-environmental vulnerability degree is 0.8511; Lianjiang City and Wuchuan City in the north belong to the moderately fragile region, the vulnerable degree is 0.6770 and 0.7679 separately; Zhanjiang Urban Area and Suixi County in the middle belong to the slightly fragile region, the vulnerable degree is 0.3423 and 0.4346 respectively.eco-environment; vulnerability; assessment; Leizhou Peninsula