摘要
以遥感中的像元二分模型为理论基础,通过求解归一化植被指数(NDVI),估算海岛植被覆盖度,形成了一个能够综合反映海岛生态系统状况的植被生态遥感评价指数,有助于不同海岛之间植被生态状况的对比分析和评价。选取舟山群岛中3个面积较大的海岛作为研究对象,利用陆地卫星TM遥感资料,计算得到3个海岛的植被生态遥感评价指数。分析表明,舟山岛的评价指数最高,其次是六横岛,最低的是岱山岛,这些差异与海岛的土地利用类型及人类开发强度密切相关。
Vegetation plays an important role in island ecosystems,thus it is of great significance to have a fast and effective approach for evaluating vegetation ecology in resource management.As we know,remote sensing has the advantages of real time,dynamic,and large-scale synchronous observation.Using remote sensing data to evaluate vegetation gives a relatively low-cost and efficient approach in island development and protection activities.A certain evaluation approach is needed to compare the vegetation status in different islands,and also some criteria to outline the vegetation status on an island.This paper summarizes an evaluation approach for evaluating the whole vegetation ecology and an Island Vegetation Ecological Evaluation Index based on the dimidiate pixel model and NDVI,which has been demonstrated in a case study.Three largest islands of Zhoushan Archipelago are chosen as the case study objects.Using TM data,the vegetation coverage in each island is calculated and classified,and finally the Island Vegetation Ecological Evaluation Index is verified.The results show that Zhoushan Island has the highest index value,refers to good ecological status,followed by Liuheng Island,then Daishan Island,which is matched by the land use type and the intensity of human development on the islands.
出处
《海洋学研究》
2011年第1期62-67,共6页
Journal of Marine Sciences
基金
国家海岛生态修复示范项目(1511011905)
国家海洋局青年海洋科学基金资助项目(2010236)
国家海洋局第二海洋研究所基本科研业务费专项资助项目(JG0909)
关键词
海岛
遥感
NDVI
植被覆盖度
海岛植被生态评价指数
island
remote sensing
NDVI
vegetation coverage
Island Vegetation Ecological Evaluation Index
