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
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
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沉积物中的叶碎片亚化石作为中国西南部广西璎珞湾近130年来红树林发育的指标
DOI：
10.1007/s13131-018-1221-5
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发表时间：
2019-08
影响因子：
1.4
通讯作者：
Li Zhen
中科院分区：
文献类型：
--
作者：
Wang Wanzhu;Meng Xianwei;Wang Xiangqin;Li Zhen
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，是当地海岸的保护者。在气候变化特别是海平面上升和人类活动的双重影响下，全球红树林面临退化，利用有效的指标重建红树林的历史发展已被认为是设计可预测模型的必要策略。作为红树林的主要产物，以亚化石形式埋藏在沉积物中的红树林叶碎片（CLFM）的含量与广泛使用的红树林花粉的含量可能具有相同的指示红树林发育的功能。本研究选取广西英落湾两个沉积物岩心（YLW02和YLW03）中的红树林叶片碎片进行加权计算，通过平行度检验和与红树林花粉浓度的统计相关性，将CLFM作为红树林发育的指标。结果清楚地表明，从红树林陆缘提取的核心（YLW03）的CLFM垂直分布仅与当地红树林物种（Rhizophora）相似。红树林向海边缘与海湾潮溪主干交界面岩心（YLW02）的CLFM垂直分布与红树林花粉浓度总和（SCMP）平行，且比YLW03的CLFM垂直分布更正相关（R=0.85，P=0.01）。这表明潮汐小溪的主干出口一定是从整个森林中收集红树林的地方，而不是从当地生产。两个岩心CLFM的变化表明，除了1940-1950年这段时间外，由于气温升高和降水减少导致海水盐度升高，莺罗湾红树林在近130年间总体上呈上升趋势；而夏季气温和降雨量的极端增加，将导致海水盐度的极端降低，这将是1940-1950年期间红树林相对退化的原因。
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.
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