河口红树林湿地沉积物有机碳动态与积累

IF 5.7 1区 农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Jian Gong , Weiwei Liu , Wei Li , Lijuan Cui
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引用次数: 0

摘要

河口红树林湿地是重要的碳汇,但其驱动沉积物有机碳(SOC)积累和埋藏的机制尚不清楚。本文全面分析了红树林和无植被生境中有机碳及其组分的分布、来源和分解,以及有机碳积累率(OCAR)在陆地-海洋梯度中的时间变化。结果表明:红树林土壤有机碳含量和储存量显著高于无植被生境,且随沉积物深度的增加而降低,主要受体积密度(BD)和沉积物含水量(SWC)的控制。易氧化性有机碳、微生物生物量碳和溶解性有机碳等活性有机碳组分的分布格局与土壤有机碳具有相似的空间分布格局。稳定同位素分析(δ13C和δ15N)和木质素生物标志物显示,红树林栖息地的有机碳分解明显高于无植被地区,这可能是由植物输入促进微生物过程和加速碳转换所驱动的。C3维管植物来源的陆地有机碳的贡献沿陆地-海洋梯度显著下降(从红树林生境的62.8%降至无植被地区的28.0%),可能是由于原位植物输入减少所致。结构方程模拟结果表明,沉积速率(SAR)、BD和SWC是影响OCAR的关键环境因子,其他相关环境因子也可能起作用。本研究增强了我们对红树林湿地碳循环机制的认识,为红树林湿地的保护和管理提供了科学依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sediment organic carbon dynamics and accumulation in estuarine mangrove wetlands
Estuarine mangrove wetlands are important carbon sinks, yet the mechanisms driving sediment organic carbon (SOC) accumulation and burial remain insufficiently understood. Here, we present comprehensive insights into the distribution, sources, and decomposition of SOC and its fractions, as well as temporal variations in organic carbon accumulation rate (OCAR), across a land-to-sea gradient in mangrove and unvegetated habitats. Our results show that SOC content and storage are significantly higher in mangrove habitats compared to unvegetated ones, both of which decrease with increasing sediment depth, primarily controlled by bulk density (BD) and sediment water content (SWC). Similarly, the distribution patterns of active organic carbon fractions, including easily oxidizable organic carbon, microbial biomass carbon, and dissolved organic carbon, exhibit similar spatial patterns to SOC across habitats. Stable isotope analyses (δ13C and δ15N) and lignin biomarkers reveal that SOC decomposition is markedly higher in mangrove habitats than in unvegetated areas, potentially driven by plant inputs that enhance microbial processes and accelerate carbon turnover. The contribution of C3 vascular plant-derived terrestrial organic carbon declines significantly along the land-to-sea gradient (from 62.8 % in mangrove habitats to 28.0 % in unvegetated areas), likely due to reduced in situ plant inputs. Structural equation modeling results indicate that sediment accumulation rate (SAR), BD, and SWC are key environmental factors influencing OCAR, while other relevant environmental factors may also contribute. This study enhances our understanding of carbon cycling mechanisms in mangrove wetlands and provides a scientific foundation for their conservation and management.
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来源期刊
Catena
Catena 环境科学-地球科学综合
CiteScore
10.50
自引率
9.70%
发文量
816
审稿时长
54 days
期刊介绍: Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.
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