| LIU Tao,TAO Yancheng,LIU Ying. 2017. Mangrove swamp expansion controlled by climate since 1988: a case study in the Nanliu River Estuary, Guangxi, Southwest China. Acta Oceanologica Sinica, 36(12):11－17 |
| Mangrove swamp expansion controlled by climate since 1988: a case study in the Nanliu River Estuary, Guangxi, Southwest China |
| 1988年以来气候控制的南流江河口红树林扩张 |
| Received:February 10, 2017 |
| DOI：10.1007/s13131-017-1097-9 |
| Key words:mangrove climate change typhoon tidal flat elevation |
| 中文关键词: 红树林 气候变化 台风 滩面高程 |
| 基金项目:The National Natural Science Foundation of China under contract No. 41306075; the Natural Science Foundation of Guangxi Province under contract No. 2014GXNSFBA118222; the Foundation of Guangxi Academy of Sciences under contract No. 12YJ25HS16. |
| Author Name | Affiliation | E-mail | | LIU Tao | School of Marine Sciences, Guangxi University, Nanning 530004, China
Guangxi Mangrove Research Center, Beihai 536000, China | salanitana@sina.com | | TAO Yancheng | Guangxi Mangrove Research Center, Beihai 536000, China | | | LIU Ying | College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China | |
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| Abstract: |
| In the Nanliu River Estuary of Guangxi, China, the naturally expanding process of a mangrove swamp (primarily consist of Aegiceras corniculatum) over past decades is studied by satellite images. From 1988 to 2013, the area of studied mangrove swamp increased significantly from 60 hm2 to 134 hm2. The expanding process is not gradual and the significant expansion only took place in some special periods. To reveal the dynamic of mangrove swamp expansion, the evolution of tidal flat elevation and the climate change in past decades are studied respectively. The hydrodynamic condition and nutrient supply are also analysed. The study results show that the climate factors of typhoon intensity and annual minimum temperature are crucial for controlling mangrove expansion. A large number of mangrove seedlings on bare tidal flats can survive only in special climate optimum periods, which are continuous years of low typhoon intensity and high annual minimum temperature. In past decades, the scarcity of climate optimum periods resulted in a non-gradual process of mangrove expanding and a time lag of 30 years between the elevation reaching the low threshold for mangrove seedling survival and the eventual emergance of the mangrove. Compared with the climate factors, the hydrodynamic condition and nutrient supply are not important factors affecting mangrove expansion. In the future, combined with global warming, the enhanced frequency and energy of landing typhoons will most likely restrain the further expansion of this mangrove swamp. |
| 中文摘要: |
| 基于卫星图像重建了近30年来广西南流江河口区一片红树林的扩张过程，结果表明：自1988年至2013年，该红树林向海显著扩张，面积由60公顷增加为134公顷。红树林的自然扩张并非渐进式，而是集中发生于某些特定时期。为了研究控制红树林扩张的动力机制，本文研究了近几十年来红树林潮坪高程演变和区域气候变化过程，同时也分析了水动力状况和营养盐供应的变化情况。研究表明：在滩面高程达到红树林幼苗存活最低高程的前提下，台风强度、频率和冬季低温是控制该红树林扩张的关键因素。红树林湿地的显著扩张只发生在台风强度和频率较低、冬季较为温暖的时期。而在台风频率和强度较高、冬季较为寒冷的时期，由于红树林幼苗难以存活，红树林则难以扩张。在过去几十年间，由于该区域适宜红树林扩张的时期较为罕见，从而导致了红树林扩张过程的不连续性。与气候因素相比，营养供应和水动力状况并不是控制该红树林扩张的关键因素。 |
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