Increased Mineral-Associated Organic Carbon and Persistent Molecules in Allochthonous Blue Carbon Ecosystems

IF 10.8 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION
Yuan Li, Chuancheng Fu, Chenglong Ye, Zhaoliang Song, Yakov Kuzyakov, Tony Vancov, Laodong Guo, Zhongkui Luo, Lukas Van Zwieten, Yidong Wang, Yu Luo, Weiqi Wang, Lin Zeng, Guangxuan Han, Hailong Wang, Yongming Luo
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Abstract

Coastal wetlands contain very large carbon (C) stocks—termed as blue C—and their management has emerged as a promising nature-based solution for climate adaptation and mitigation. The interactions among sources, pools, and molecular compositions of soil organic C (SOC) within blue C ecosystems (BCEs) remain elusive. Here, we explore these interactions along an 18,000 km long coastal line of salt marshes, mangroves, and seagrasses in China. We found that mineral-associated organic C (MAOC) is enriched in BCEs dominated by allochthonous inputs and abundant active minerals, leading to an increased proportion of persistent organic molecules. Specifically, soils with large allochthonous inputs (> 50%) are characterized by a substantial contribution of MAOC (> 70%) to total SOC with a notable preservation of lipids (36%) across salt marshes, mangroves, and seagrasses. The burial of allochthonous particles, derived from external sources such as rivers or tidal influxes, facilitates the formation of stable MAOC through binding to mineral surfaces or occlusion within microaggregates. The proportions of particulate organic C (POC) and MAOC are important predictors for molecular compositions of soil organic matter. Lipid proportions within molecular composition decrease as POC and autochthonous C proportions increase. These findings provide new insights into the coupled control over SOC sequestration in BCEs, emphasizing the role of allochthonous inputs, proportions of carbon pools, and persistent organic components.

Abstract Image

Abstract Image

外来蓝碳生态系统中矿物相关有机碳和持久性分子的增加
沿海湿地含有非常大的碳(C)储量(称为蓝碳),对其进行管理已成为适应和减缓气候变化的一种有希望的基于自然的解决方案。蓝碳生态系统土壤有机碳(SOC)的源、库和分子组成之间的相互作用尚不明确。在这里,我们沿着中国长达18,000公里的盐沼、红树林和海草海岸线探索这些相互作用。我们发现矿物相关有机C (MAOC)在以外来输入和丰富的活性矿物为主的bce中富集,导致持久性有机分子的比例增加。具体而言,在盐沼、红树林和海草中,大量外来输入(> 50%)的土壤的特点是MAOC对总有机碳的贡献很大(> 70%),脂质保存显著(36%)。来自外部来源(如河流或潮汐)的外来颗粒的埋藏,通过与矿物表面结合或在微聚集体内闭塞,促进了稳定的MAOC的形成。颗粒有机碳(POC)和MAOC的比例是土壤有机质分子组成的重要预测指标。分子组成中的脂质比例随着POC和原生C比例的增加而降低。这些发现强调了外来输入、碳库比例和持久性有机成分的作用,为研究生物碳碳封存的耦合控制提供了新的见解。
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来源期刊
Global Change Biology
Global Change Biology 环境科学-环境科学
CiteScore
21.50
自引率
5.20%
发文量
497
审稿时长
3.3 months
期刊介绍: Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health. Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.
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