Biogenic silica dynamics in coastal wetland sediments: A key driver of silicon and carbon biogeochemical cycling

IF 3.8 1区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Pub Date : 2024-10-23 DOI:10.1002/lno.12717
Xiangwei Zhao, Zhaoliang Song, Yuntao Wu, Lukas Van Zwieten, Laodong Guo, Changxun Yu, Zimin Li, Lele Wu, Xiaomin Yang, Xiangbin Ran, Jun Sun, Yuqiu Wei, Yidong Wang, Peng Yuan, Jianping Zhang, Xiaole Sun, Xinxin Zuo, Tony Vancov, Cong‐Qiang Liu, Hailong Wang
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Abstract

Biogenic silica (biogenic Si) is a bioactive component crucial for the biogeochemical cycling of Si in terrestrial and aquatic ecosystems. Its formation and dissolution dynamics are intricately linked to carbon (C) cycling. However, knowledge about the source, composition, and factors controlling the distribution of biogenic Si in coastal wetland sedimentary environments is still limited. To address this lack of knowledge, we introduced a suite of geometric models for biogenic Si biovolume calculation and investigated biogenic Si assemblages, along with biogenic Si and biogenic Si‐occluded C contents, in sediments from representative coastal wetlands along the west coast of Bohai Bay. Our analysis showed that sedimentary biogenic Si predominantly derived from phytoliths (78.1% ± 5.8%), diatoms (18.2% ± 4.8%), and sponge spicules (3.7% ± 2.9%). Notably, phytolith assemblages were primarily composed of forms derived from the Poaceae family. The biogenic Si‐occluded C content (0.035–1.870 g kg−1) within these wetland sediments was consistent across both sites, accounting for 0.97–5.71% of the total organic C pool. Structural equation modeling indicated that total organic C, pH, and amorphous aluminum oxides either directly or indirectly influenced the biogenic Si content in coastal wetlands sediments. These results demonstrate the critical role that biogenic Si plays in the Si biogeochemical cycle and provide valuable information that advances our understanding of the biogeochemical interactions between Si and C in coastal wetland ecosystems.
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沿海湿地沉积物中的生物硅动态:硅与碳生物地球化学循环的关键驱动因素
生物硅(生物硅)是一种生物活性成分,对陆地和水生生态系统中硅的生物地球化学循环至关重要。它的形成和溶解动态与碳(C)循环密切相关。然而,有关沿海湿地沉积环境中生物硅的来源、组成和分布控制因素的知识仍然有限。为了解决这一知识缺乏的问题,我们引入了一套用于计算生物硅生物体积的几何模型,并研究了渤海湾西岸代表性滨海湿地沉积物中的生物硅组合以及生物硅和生物硅包含碳的含量。我们的分析表明,沉积物中的生物硅主要来源于植金石(78.1%±5.8%)、硅藻(18.2%±4.8%)和海绵海绵体(3.7%±2.9%)。值得注意的是,植物岩石组合主要由蒲葵科植物组成。这些湿地沉积物中的生物源 Si-occluded C 含量(0.035-1.870 g kg-1)在两个地点都是一致的,占总有机 C 池的 0.97-5.71%。结构方程模型表明,总有机碳、pH 值和无定形氧化铝直接或间接地影响了沿岸湿地沉积物中的生物硅含量。这些结果证明了生物硅在硅生物地球化学循环中的关键作用,并提供了宝贵的信息,有助于我们进一步了解沿海湿地生态系统中硅和碳之间的生物地球化学相互作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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