Organic carbon isotope and pollen evidence for mangrove development and response to human activity in Guangxi (Southwest China) over the last 140 years
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- 作者：Peng Xia ; Xianwei Meng ; Zhen Li ; Aiping Feng
- 关键词：mangrove development ; organic carbon isotope ; pollen ; human activity ; Guangxi
- 刊名：Acta Oceanologica Sinica
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：36
- 期：2
- 页码：11-21
- 全文大小：
- 刊物主题：Oceanography; Climatology; Ecology; Engineering Fluid Dynamics; Marine & Freshwater Sciences; Environmental Chemistry;
- 出版者：The Chinese Society of Oceanography
- ISSN：1869-1099
- 卷排序：36
文摘
Mangrove degradation must reduce carbon sequestration in recent years, thereby aggravating global warming. Thus, short-term impacts of human activity on mangrove ecosystems are cause for concern from local governments and scientists. Mangroves sediments can provide detailed records of mangrove species variation in the last one hundred years, based on detailed 210Pb data. The study traced the history of mangrove development and its response to environmental change over the last 140 years in two mangrove swamps of Guangxi, Southwest China. Average sedimentation rates were calculated to be 0.48 cm/a and 0.56 cm/a in the Yingluo Bay and the Maowei Sea, respectively. Chemical indicators (δ13Corg and C:N) were utilized to trace the contribution of mangrove-derived organic matter (MOM) using a ternary mixing model. Simultaneous use of mangrove pollen can help to supplement some of these limitations in diagenetic/overlap of isotopic signatures. We found that vertical distribution of MOM was consistent with mangrove pollen, which could provide similar information for tracing mangrove ecosystems. Therefore, mangrove development was reconstructed and divided into three stages: flourishing, degradation and re-flourishing/re-degradation period. The significant degradation, found in the period of 1968–1998 and 1907–2007 in the Yingluo Bay and the Maowei Sea, respectively, corresponding to a rapid increase of reclamation area and seawall length, rather than climate change as recorded in the region.