热带地理Issue(3)：366-373,8.
漓江流域干旱与洪涝灾害生态风险评价与管理
Ecological Risk Assessment and Management of Floods and Droughts in the Li River Basin
摘要
Abstract
Regional ecological risk assessment is the foundation of ecological risk management. The ecological risk assessment of river basins should consider the integrity and relative independence of the geographical unit. Based on historical literatures, natural geographic data, and socio-economic data, this study chooses droughts and floods that are the major natural disasters intheLi River Basin as risk sources, and 161 sub-basins as assessment units. According to the relative risk assessment model, comprehensive ecological risks in this river basin are evaluated based on risk source, vulnerability, and ability to resist risk. Results show a large spatial variation of the ecological risk intheLi River Basin. Lingui County, north of Linchuan County, and Xin’an County are the high-risk regions with weak infrastructures, unstable landscapes, and vulnerable ecology, accounting for 2.3% of the total area of the basin. Risks are relatively low in the Mao’er Mountain and the Haiyang MountainNature Reserves due to weak anthropogenic activities, well preserved vegetation, and stable landscapes, the areas of the reserves account for about 59.0% of the total basin area. Benefited from the improved infrastructure,GuilinCity in the midstream has a low risk as well. However, non-negligible potential risks exist in Yangshuo County in the downstream of the Li River, which belongs to the mid-risk region.Based on the risk assessment, measures to prevent ecological risk have been proposed. For the high-risk regions, attention should be paid to the protection of the vegetation. With the help of remote sensing, the monitoring and management of the environment can reduce the frequency of the risk. On the other hand, hydrological model can simulate the spatial and temporal distribution of the water, valid adjustment measures should be adopted to reduce the damage of drought and flood disaster. For the regions suffering from higher frequency disasters, ecological migration should be considered. For the regions of mid-risk in LingchuanCounty and Xin’anCounty, unreasonable farming mustbe forbidden, which breaks the stability of landscape. The industrial structure in the regions should be adjusted to decrease their dependence on water. Most of the relative-low-risk regions belong to Karst landform, where there is difficulty in the modulation of water, attention should be paid to protection of the environment to reduce the damage of the risk. The low-risk regions are located inGuilinCity where there are consummate infrastructures, and in the Mao’er Mountain and Haiyang Mountain Reserveswhere the landscapes are stable. To maintain the management of the Reserves, preventing the interference from tourism seems to be an effective way. This study aims at improving our understanding of the ecological risk management intheLi River Basin.关键词
生态风险/干旱/洪涝/相对风险模型/漓江流域Key words
ecological risk/drought/flood/relative risk model/theLi River Basin分类
资源环境引用本文复制引用
汪疆玮,蒙吉军..漓江流域干旱与洪涝灾害生态风险评价与管理[J].热带地理,2014,(3):366-373,8.基金项目
国家科技支撑课题（2012BAC16B04）；国家自然科学基金项目 （）
