| 摘要: |
| 滨海湿地是雁鸭类水鸟的重要栖息地，然而高强度的海岸圈围工程对滨海湿地生态系统和鸟类栖息地造成了显著影响，因此分析和研究海岸圈围对雁鸭类水鸟种群及栖息地的影响，对水鸟保护和滨海湿地资源可持续利用具有重要的理论和实践意义。位于长江口的横沙东滩，于2003年启动了海岸圈围促淤工程，工程的实施导致湿地生境和水鸟种群都发生着快速变化。本研究分别对2013、2015、2016和2017年，横沙东滩雁鸭类水鸟种群和生境因子的时空变化进行了调查与分析，通过拟合回归分析得到两者的相关关系，进一步探讨海岸圈围后生境的快速演替对雁鸭类水鸟种群产生的影响，从而提出海岸带圈围后水鸟栖息地的保护与管理对策。结果表明：1）海岸圈围工程的实施显著改变了滨海湿地的水鸟生境及种群特征。随着工程的推进，自然潮滩的盐沼湿地呈动态变化趋势；促淤区则随着泥沙的补给，新生了大面积的沼泽湿地；成陆区逐渐向淡水生态系统演替。伴随着生境的变化，雁鸭类水鸟种群逐渐从成陆区和自然潮滩向促淤区转移。2）不同生境类型影响雁鸭类种群数量特征的生境因子不同。未实施圈围的自然潮滩影响雁鸭类水鸟数量的主要因素是海三棱藨草/藨草群落面积；正在实施圈围的促淤区的主要影响因素是挺水植物面积、植被归一化指数（NDVI）和无植被覆盖水域面积；已圈围的成陆区主要影响因素为沉水植物面积。综上，雁鸭类水鸟偏向选择具有开阔水域、充足食物供给和相对较低植被盖度的生境类型。对于海岸圈围区域，若能合理利用圈围土地，保留部分区域为湿地，并根据水鸟的生境需求，适当营造水鸟适宜的栖息地，可在一定程度上减缓圈围工程对水鸟的影响，实现滨海湿地水鸟栖息地保护和湿地资源可持续利用的动态平衡。 |
| 关键词: 海岸圈围，滨海湿地，雁鸭类水鸟，生境，横沙东滩 |
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| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目），上海市科委科研计划项目，上海市绿化局科研专项 |
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| Effects of coastal reclamation on the population and habitat of Anseriformes birds |
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Pan Jialin1, YUAN LIN1, Yuan Xiao2, Fu Shunqi2, Zhao Zhiyuan1, Zhu Xiaojing1, Chen Yahui1, Li Yang1, Zhang Jinlei1
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1.East China Normal University;2.Shanghai Wildlife and Plant Protection Admnistration station
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| Abstract: |
| Coastal wetland is an important habitat for Anseriformes birds, but high intensity coastal reclamation has seriously affected the coastal wetland ecosystem and waterbirds habitats. Therefore, analysis of impacts of coastal reclamation on the population and habitat of Anseriformes birds has important theoretical and practical significance for the protection of waterbirds and the sustainable utilization of coastal wetland resources. In 2003, the coastal reclamation engineering was carried out in the east Hengsha shoal, Shanghai. It lead to rapid changes in the habitat and the population of Anseriformes birds. This study analyzed the spatial and temporal changes of habitat and population Anseriformes birds during the winter migration period in 2013, 2015, 2016 and 2017. To explore the effects of habitats succession on the Anseriformes birds population, the correlations between the numbers of Anseriformes population and habitat factors were obtained by fitting regression analysis. The results showed that: 1) The coastal reclamation significantly changed the population and habitat of Anseriformes. With the implement of engineering, saltmarshes showed a dynamic trend in the natural tidal flat; large area of marsh development with the replenishment of sediment in the deposit-promoting region; the land-forming region gradually succeed to freshwater ecosystems. In addition, with the changes of habitat, Anseriformes birds gradually transferred from the land-forming region and natural tidal flat to the deposit-promoting region. 2) Different types of habitats have different factors that influence Anseriformes populations. The area of Scripus mariqueter was the main factor in the natural tidal flat; the area of emergent plants, NDVI index and unvegetated water area were the main factors in the deposit-promoting region; the area of submerged plants was the main factor in the land-forming region. In general, Anseriformes birds prefer a type of habitat with open waters, adequate food supply and relatively low vegetation coverage. For the coastal reclaimed zone, preserving parts of wetland and creating a suitable bird habitat could reduce the negative effects on waterbirds to some extent. It could also achieve the dynamic balance of waterbirds habitat protection and sustainable use of wetland resources in coastal zone. |
| Key words: coastal reclamation, coastal wetland, Anseriformes birds, habitat, east Hengsha shoal |