Response of Mangrove Development to Air Temperature Variation Over the Past 3000 Years in Qinzhou Bay, Tropical China
Response of Mangrove Development to Air Temperature Variation Over the Past 3000 Years in Qinzhou Bay, Tropical China
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近3000年来热带钦州湾红树林发育对气温变化的响应中国
DOI：
10.3389/feart.2021.678189
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发表时间：
2021-05
期刊：
影响因子：
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通讯作者：
Yao Zhang;Xian-wei Meng;Peng Xia;Zhen Li
中科院分区：
文献类型：
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作者：
Yao Zhang;Xian-wei Meng;Peng Xia;Zhen Li
红树林是位于亚热带陆地和海洋之间的蓝碳生态系统，对气候和海平面的变化非常敏感。在全球迅速变化的背景下，重建红树林发展的历史动力学，预测红树林生态系统的命运是当务之急。采用基于稳定有机碳同位素和C/N比值的端元混合模式，对钦州湾Q43柱样沉积物中有机质的来源记录进行了分析。红树林有机质是重建红树林历史发展的可靠指标。钦州湾近3,000 cal yr BP以来的古生物量变化表明，红树林经历了2000 - 1750 cal yr BP和1370 -600 cal yr BP两个演替阶段，以及3,000- 2200 cal yr BP、1750 - 1370 cal yr BP和1600 -0 cal yr BP三个退化阶段。在可能产生影响的因素中，相对海平面和区域水文环境的变化（例如，海水温度、盐度和水动力条件）对红树林的生长/退化没有显著影响。然而，气候变化，特别是气温的变化，是控制红树林发展的主要因素。红树林的繁盛期和衰退期分别对应于气候的暖期和冷期。值得注意的是，在人类世温暖时期，气温的迅速上升本应促进红树林的发展，但人类活动强度的增加扭转了这一趋势，导致红树林退化。
Mangroves, a blue carbon ecosystem between land and ocean in the (sub)tropics, are sensitive to changes in climate and the sea level. It is imperative to reconstruct the historical dynamics of their development to predict the fate of mangrove ecosystems in the backdrop of rapid global changes. This study analyzes records of the sources of organic matter from sediment core Q43 of Qinzhou Bay in tropical China by using the endmember mixing model based on stable organic carbon isotopes and C/N ratio. Mangrove-derived organic matter (MOM) is regarded as a reliable indicator for reconstructing the historical development of mangroves. The variations in MOM in Qinzhou Bay over the past ∼3,000 cal yr BP indicate that mangrove forests underwent two periods of flourishment: ∼2,200–1,750 cal yr BP and ∼1,370–600 cal yr BP, as well as three periods of deterioration: ∼3,000–2,200 cal yr BP, ∼1,750–1,370 cal yr BP, and ∼600–0 cal yr BP. Of factors that might have been influential, changes in the relative sea level and the regional hydrological environment (e.g., seawater temperature, salinity, and hydrodynamic conditions) did not appear to have notable effects on mangrove flourishing/degradation. However, climate change, especially the variation in air temperature, formed the primary factor controlling mangrove development. The stages of mangrove flourishing/deterioration corresponded to the warm/cold periods of the climate, respectively. Noteworthy is that the rapid rise in air temperature during the Anthropocene warm period should have promoted mangrove development, but the increasing intensity of human activity has reversed this tendency leading to the degradation of mangroves.