摘要:
通过对1978-2014年的5期遥感影像和地理地形资料的综合分析研究,结合实地调查验证,得出了伶仃洋海岸线和红树林湿地时空分布演变的趋势.总体而言,海岸线的总长度逐年增加,其中人工海岸线长度也是逐年增加的,2014年人工海岸线长度占总岸线长度的73.3%.全区岸线主要为向海推进海岸,东、西两岸海岸线的推进又各有特点.红树林湿地的时空分布发生了巨大变化,其总面积整体上在减少,但2003-2014年间由于红树林保护力度的增加,红树林湿地面积有所回升.海岸线变迁和红树林湿地演变主要受人为因素的影响,如筑堤围垸、围海造地、建设用地增加等.研究获得的成果数据为红树林湿地的生态保护和修复提供了重要的决策数据.
Abstract:
Based on large quantities of remote sensing data and topographic data,the authors studied the evolution of the shoreline and mangrove wetland in Lingdingyang Estuary since 1978.The results show that the evolution of the shoreline in the east bank and in the west bank was different from 1978 to 2014,and the shoreline has been mainly man-made since 1978.In 2014,the artificial shoreline accounted for 73.3% of the total length of the shoreline.Compared with the west bank,the east bank was developed faster.The mangrove wetlands were largely lost because of intensified human activities in the study area from 1978 to 2014.The analytical results clearly show the fluctuations for the areas of mangrove wetland in the past four decades.Many natural mangrove forests have disappeared because of reclamation projects.Only those in the reserves,such as the Qi 'ao Island,Futian mangrove forests,have been well protected under strict conservation policies.
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