广西海岛岸线资源空间分布特征及其利用模式研究

Research on Spatial Distribution Characteristics and Utilization Modes for Coastline Resources of Guangxi islands

海岛的可持续发展关乎海洋生态平衡、海洋经济发展和国家安全。海岛岸线空间资源是海岛开发利用价值的核心内容之一。本文基于数理统计和经验正交函数分析法,分析广西646个海岛的岸线长度、岸线系数及岸线空间资源利用模式。结果表明:1)广西海岛岸线长度小,大部分海岛的岸线长度小于2 000m,可利用岸线资源贫乏。2)岸线系数超过0.2的海岛仅占海岛总数的5%,大部分海岛的岸线空间利用价值不大。3)广西海岛岸线资源利用可分为4个模态,其中第一模态反映了岸线资源利用为特征的主要模态,相关指标包括三通一平、近陆距离、海岛面积、海岛侵蚀能力;第二模态仍是表征岸线资源利用为主的模态,但指标主要包括最高点高程和海岛侵蚀能力;第三、四模态是海岛以生态环境保护为主的次要模态,包括植被覆盖、最高点高程两个主要指标。

The sustainable development of islands is essential to oceanic ecological balance,marine economic development and national security.Utilizing resources along island＇s coastline is one of the key aspects for the development of islands.In this study,length of coastline,coefficient of coastline and mode of resources utility for 646 islands in Guangxi province were analyzed by using the methods of mathematical statistics and empirical orthogonal function.The results showed that：1）coastline length for most islands are less than 2 000 m,and therefore available resources along the coastline are limited;2）islands with coastline coefficient over 0.2only account for 5% of the total ones,which constrain the utilization of coastline;and 3）the utilization of coastline can be divided into the following four modes.The first mode,characterized by three supplies and leveling,landward distance,island size and island erosion capability,is the main mode of coastline utilization.The second mode also works on coastal resources utilization,which,however,is dominated by the altitude of the highest point and island erosion capability.In addition,the third and fourth modes are minor modes,dominated by ecological environmental protection including two main indicators such as taking vegetation cover and the altitude of the highest point.