基于投影寻踪的珠江三角洲景观生态安全评价
Landscape ecological security assessment based on projection pursuit:a case study of nine cities in the Pearl River Delta
查看参考文献37篇
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文摘
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区域景观生态安全是生态安全的重要组成部分,对于国家安全和社会可持续发展具有重要影响.以1990年和2005年珠江三角洲Landsat5TM和Landsat7ETM+遥感数据为基本数据源,选取聚集度,景观破碎度,景观形状指数,Shannon多样性指数,并构建了景观脆弱度指数和景观安全邻接指数,对研究区景观空间格局变化进行对比分析.在此基础上,利用基于遗传算法的投影寻踪方法,计算景观生态安全指数,评价研究区的景观生态安全状况.结果表明:(1)从1990年到2005年,珠江三角洲9市的聚集度,破碎度,景观形状指数和Shannon多样性指数变化不大,而景观脆弱度和景观安全邻接指数变化显著,9市的景观脆弱度都呈现减少趋势,而9市景观安全邻接指数都呈增加趋势.(2)从1990年到2005年,珠海和惠州两市景观生态安全状况一直保持良好,而东莞和中山两市的景观生态安全值一直较低;除佛山和广州两市景观生态安全状况略有提高外,其它7市景观生态安全值都有一定程度的减小,其中以肇庆市降低最多.珠江三角洲地区经济高速发展,人为活动剧烈,利用投影寻踪方法构建景观生态安全指数,评价高强度发展区域的景观生态安全状况是有效,可行的 |
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其他语种文摘
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Regional landscape ecological security is an important issue for overall ecological security, and also has a great influence on national security and social sustainable development. Based on the products of the Landsat 5 TM images in 1990 and the Landsat 7 ETM + images in 2005, landscape classification maps of nine cities in the Pearl River Delta (PRD) have been compiled by using remote sensing (RS) and geographic information system (GIS) technology. Using the aggregation index, crush index, landscape shape index, Shannon diversity index, landscape fragility index and landscape security adjacent index, the spatial-temporal characteristics of landscape patterns in the PRD were analyzed. On the basis of these results, the landscape ecological security index was calculated by using projection pursuit which is based on a genetic algorithm, and the landscape ecological security of the nine cities in the PRD was thus evaluated. The main results of this research were:(1) from 1990 to 2005, there was little change in the aggregation index, crush index, landscape shape index, and Shannon diversity index of the nine cities, while the landscape fragility index and landscape security adjacent index changed substantially. The landscape fragility index showed a decreasing trend, but the landscape security adjacent index has been increasing; (2) from 1990 to 2005, the landscape ecology of Zhuhai and Huizhou cities maintained a good security situation, but relatively low values of ecological security were seen in Dongguan and Foshan cities. Except for Foshan and Guangzhou cities, whose landscape ecological security situation improved slightly, the other seven cities had reduced values of landscape ecological security, among which the largest decrease was 0. 5193 in Zhaoqing City. The PRD has experienced rapid economic development and intensive human activities in recent years. This study, based on landscape analysis, provides a sound method to discover the alteration of character among different landscape types and to understand the landscape ecological security status. The results of this study might offer important information for regional eco-construction and natural resource exploitation |
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来源
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生态学报
,2010,30(21):5894-5903 【核心库】
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关键词
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景观生态安全
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景观指数
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投影寻踪
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珠江三角洲
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地址
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1.
中国科学院广州地球化学研究所, 广州, 510640
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国家海洋局南海海洋工程勘察与环境研究院, 广州, 510300
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广东省生态环境与土壤研究所, 广州, 510650
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0933 |
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学科
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环境科学基础理论 |
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基金
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国家自然科学基金资助项目
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广东省自然科学基金
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文献收藏号
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CSCD:4045303
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