Organic carbon isotope and pollen evidence for mangrove development and response to human activity in Guangxi (Southwest China) over the last 140 years

XIA Peng; MENG Xianwei; LI Zhen; FENG Aiping

doi:10.1007/s13131-016-0849-2

近140年来广西红树林演变及其对人类活动的响应:有机碳和孢粉联合示踪

doi: 10.1007/s13131-016-0849-2

1.
国家海洋局第一海洋研究所, 山东青岛 266061
2.
国家海洋局第一海洋研究所, 山东青岛 266061;青岛海洋科学与技术国家实验室海洋地质与环境功能实验室, 山东青岛 266237
3.
维多利亚大学地球和海洋科学学院, 加拿大哥伦比亚 V8W2Y2

基金项目: The National Basic Research Program (973 Program) of China under contract No. 2010CB951203; the National Natural Science Foundation of China under contract Nos 41206057, 41576067, 41376075 and 41576061.

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- 收稿日期: 2015-11-19
- 修回日期: 2016-01-06

Organic carbon isotope and pollen evidence for mangrove development and response to human activity in Guangxi (Southwest China) over the last 140 years

1.
The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
2.
The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
3.
School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia, V8W 2Y2, Canada

摘要

摘要: 人类活动引起的近期红树林衰退势必减少碳埋藏，加剧全球气候变暖；这已得到当地政府和科学家的广泛关注。人类活动制约下的红树林演变是一种短时间尺度效应，而沉积物则是记录这种响应的最佳档案。本文通过广西典型红树林区（英罗湾和茅尾海）两根柱状沉积物中有机碳同位素（δ¹³C）、C：N比值和孢粉鉴定，以沉积物中的红树林源有机碳贡献和红树孢粉组合为示踪参数，在210Pb年龄框架构建的基础上，揭示百年来广西红树林兴衰和群落演替规律。联合使用红树孢粉可以弥补有机碳同位素在早期成岩/端元信号重叠方面的限制。研究发现：红树林源有机碳贡献和红树孢粉含量具有相似的垂向分布趋势，可联合示踪红树林演变历史。据此可将广西近140年来的红树林演变划分为三个阶段：繁盛期、衰退期和二次繁盛/衰退期。结合气候变化和人类活动数据，发现1968-1998（英罗湾）和1907-2007年间（茅尾海）红树林的显著衰退主要源于人类活动，尤其是滩涂围垦、海堤建设等；而与气候变化关系不大。
- 红树林演变 /
- 有机碳同位素 /
- 孢粉 /
- 人类活动 /
- 广西
Abstract: 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 (δ¹³C_org 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.
- mangrove development /
- organic carbon isotope /
- pollen /
- human activity /
- Guangxi

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参考文献(51)

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近140年来广西红树林演变及其对人类活动的响应:有机碳和孢粉联合示踪

doi: 10.1007/s13131-016-0849-2

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出版历程

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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