| Wang Wanzhu,Meng Xianwei,Wang Xiangqin,Li Zhen. 2019. The sub-fossils of leaf fragments in sediments as an indicator of mangrove development in the Yingluo Bay, Guangxi, Southwest China over the last 130 years. Acta Oceanologica Sinica, 38(8):27－34 |
| The sub-fossils of leaf fragments in sediments as an indicator of mangrove development in the Yingluo Bay, Guangxi, Southwest China over the last 130 years |
| 中国西南广西英罗湾红树林近130年来演化指标——沉积物中的红树叶片亚化石 |
| Received:February 01, 2018 |
| DOI：10.1007/s13131-018-1221-5 |
| Key words:leaf fragment mangrove development Yingluo Bay last 130 years air temperature and rainfall |
| 中文关键词: 叶片碎屑 红树林演化 英罗湾 近130年来 气温和降雨 |
| 基金项目:The National Natural Science Foundation of China under contract Nos 41376075 and 41576061. |
| Author Name | Affiliation | E-mail | | Wang Wanzhu | Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Meng Xianwei | Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
Laboratory for Marine Geology and Environment, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China | mxw@fio.org.cn | | Wang Xiangqin | Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Li Zhen | School of Earth and Ocean Sciences, University of Victoria, British Columbia V8W, Canada | |
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| Abstract: |
| Located in the intertidal zone of the tropical and subtropical coasts, mangrove forests are an important ecosystem in the global carbon cycle and serve as a protector of local seashores. Under the double impacts of climate change, especially sea-level rise, and human activity, mangrove forests around the world have faced degradation, against which the reconstruction of the historical development of mangrove forests using an effective indicator has been regarded as a necessary strategy for designing a predictable model. As the primary product of mangrove forest, it is reasonable that the content of leaf fragments of mangrove (CLFM) buried in sediments in the form of sub-fossils potentially has the same indicative function for the development of mangrove forests as that of widely-used mangrove pollen. In this study, the leaf fragments of mangrove in two sediment cores (YLW02 and YLW03) drilled in the Yingluo Bay in Guangxi, Southwest China were picked out and weighted for calculation of CLFM, which was used as an indicator of mangrove development after examination of parallelism and a statistical correlation of the CLFM with the concentration of mangrove pollen. The results clearly show that the vertical distribution of the CLFM for the core taken from the landward margin of mangrove forests (YLW03) only parallels that of the local mangrove species (Rhizophora. stylosa) with a significantly positive correlation (R=0.56, P=0.05), while the vertical distribution of the CLFM for the core taken from the interface between seaward margin of mangrove forest and the trunk of tidal creeks of the bay (YLW02) parallels the summed concentration of mangrove pollen (SCMP) with a more positive correlation than that of YLW03 (R=0.85, P=0.01), indicating that the trunk outlet of tidal creeks must have been the site where mangrove production gathered from the overall forest rather than from local production. The variations in the CLFM of both cores indicate that overall the mangrove forests in the Yingluo Bay have increasingly flourished over the last 130 years except for the interval of 1940–1950 AD in response to an increase in air temperature and decrease in rainfall, which would have resulted in an increase in seawater salinity; while the coupled extreme increases in air temperature and in rainfall in summer, which would have resulted in extreme decreases in seawater salinity, would be responsible for the relative degradation of mangrove forests in the interval of 1940–1950 AD. |
| 中文摘要: |
| 红树林位于热带和亚热带海岸的潮间带，是全球碳循环中重要的生态系统，是当地海岸带的保护区。在气候变化，特别是海平面上升和人类活动的双重影响下，世界各地的红树林面临退化，利用有效的指标重建红树林的历史发展被认为是设计可预测模型的必要战略。红树花粉已被广泛用作红树林发展的指标，而作为红树林的初级产物，以亚化石形式埋藏在沉积物中的叶片碎屑的含量理论上对于红树林的发育具有与红树花粉相同的指示功能。在这项研究中， 选取广西英罗湾的两根柱状沉积物（YLW02和YLW03），挑出沉积物中的叶片碎屑并进行称重，在进行了红树花粉浓度与叶片碎屑的平行实验以及统计相关性分析后，它们的重量百分比被用来作为指示红树林发展的指标。结果清楚地表明，从红树林内部（YLW03）采集的柱状沉积物中的叶片碎屑含量垂直分布仅与当地红树林物种（R. stylosa）的垂直分布呈显着正相关（r = 0.56，P = 0.05） ，而海湾潮沟主岔道（YLW02）附近柱状沉积物的叶片碎屑含量垂直分布与红树林花粉总浓度呈正相关，且相关系数更高（r = 0.85，P = 0.01）。这说明潮沟岔道是整个红树林聚集而不是生产的地方。两个柱状沉积物的叶片碎屑含量变化表明，在1940-1950年间，由于温度的急剧上升和降雨的增多，导致海水盐度的急剧下降，引起了红树林显著退化。除此之外，英罗湾在过去130年间，整体呈现温度上升和降雨量减少的趋势，致使海水盐度不断增加，因此英罗湾地区的红树林在过去130年内总体上日益繁荣。 |
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