Restoration depth mediates seasonal recalcitrant carbon retention capacity in tropical seagrass meadows

IF 2.6 3区地球科学 Q1 MARINE & FRESHWATER BIOLOGY

Estuarine Coastal and Shelf Science Pub Date : 2025-09-03 DOI:10.1016/j.ecss.2025.109533

Yuzheng Ren , Qianwen Sun , Songlin Liu , Carolyn J. Ewers Lewis , Hongxue Luo , Lanlan Xiong , Xia Zhang , Yuying Huang , Zhijian Jiang , Yunchao Wu , Xiaoping Huang

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引用次数: 0

Abstract

Seagrass restoration enhances carbon sequestration by promoting suspended particulate matter (SPM) capture, yet the effects of season and water depth on deposition dynamics in restored meadows remain unclear. This study investigated seasonal and depth-driven SPM dynamics in transplanted Enhalus acoroides meadows across tropical Indo-Pacific coastal intertidal zones (shallow: 0.6 m; medium: 0.9 m; deep: 1.1 m). Season emerged as a critical driver, with summer exhibiting 2.5-fold higher particulate deposition rates (0.13 ± 0.02 g DW m⁻² d⁻¹) compared to winter (0.05 ± 0.01 g DW m⁻² d⁻¹). Elevated seagrass leaf length (about 42 %) in summer drove 1.5–3.1 times greater deposition of particulate organic matter (POM), inorganic matter (PIM), and their carbon components (POC and PIC). Crucially, restoration zones prioritised stable carbon sequestration, retaining 2.1–2.6 times more recalcitrant/refractory organic carbon in summer than those in winter period. Water depth acted as a modulating factor though no significant differences, with medium zones (0.9 m) achieving peak deposition efficiency through optimal light availability (sustaining canopy growth) and moderated hydrodynamics (flow velocity increased by 51 % compared to deep zones). These findings suggest that medium-depth zones (0.9 m) emerge as optimal E. acoroides restoration targets to maximize current carbon sequestration efficiency, offering critical insights for climate-resilient blue carbon management.

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恢复深度调节热带海草草甸的季节性顽固碳保持能力

海草恢复通过促进悬浮颗粒物（SPM）捕获来增强碳固存，但季节和水深对恢复草甸沉积动态的影响尚不清楚。本研究调查了热带印度洋-太平洋沿海潮间带（浅：0.6 m，中：0.9 m，深：1.1 m）移植的恩halus acoroides草甸SPM的季节性和深度驱动动态。季节是关键的驱动因素，夏季的颗粒沉积率（0.13±0.02 g DW m−2 d−1）是冬季（0.05±0.01 g DW m−2 d−1）的2.5倍。夏季海草叶长增加（约42%），颗粒物有机质（POM）、无机物（PIM）及其碳组分（POC和PIC）的沉积量增加1.5 ~ 3.1倍。至关重要的是，恢复区优先考虑稳定的碳固存，夏季顽固/难降解有机碳的保留率是冬季的2.1-2.6倍。水深是一个调节因素，但没有显著差异，中水深区（0.9 m）通过最佳的光可用性（维持冠层生长）和缓和的水动力学（流速比深水深区增加51%）达到峰值沉积效率。这些发现表明，中深度区域（0.9 m）是最佳的acoroides恢复目标，可以最大限度地提高当前的碳固存效率，为气候适应型蓝碳管理提供重要见解。

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

Estuarine Coastal and Shelf Science 地学-海洋学

CiteScore

5.60

自引率

7.10%

发文量

374

审稿时长

9 months

期刊介绍： Estuarine, Coastal and Shelf Science is an international multidisciplinary journal devoted to the analysis of saline water phenomena ranging from the outer edge of the continental shelf to the upper limits of the tidal zone. The journal provides a unique forum, unifying the multidisciplinary approaches to the study of the oceanography of estuaries, coastal zones, and continental shelf seas. It features original research papers, review papers and short communications treating such disciplines as zoology, botany, geology, sedimentology, physical oceanography.