<br>典型红树林生态系统中蓝碳“损失”和“增益”的空间格局及其驱动机制——以广西北海为例,Science of the Total Environment

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典型红树林生态系统中蓝碳“损失”和“增益”的空间格局及其驱动机制——以广西北海为例
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-09-21 , DOI: 10.1016/j.scitotenv.2023.167241
Zhenxi Xie ₁ , Haonan Li ₁ , Yuan Yuan ₁ , Wei Hu ₁ , Gang Luo ₁ , Longtian Huang ₁ , Mo Chen ₁ , Weimei Wu ₁ , Guiling Yan ₁ , Xiang Sun ₂

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红树林在碳封存中的作用对于缓解气候变化至关重要。为了更好地识别受环境因子影响的红树林碳守恒热点，需要阐明红树林植被和土壤固碳的空间分布和驱动机制，以及红树林未来的碳动态。首先，评估了广西小管沙市植被生物量和土壤深度变化土壤总有机碳（TOC）的空间格局，并探讨了其与淹没持续时间（DTI）的关系。此外，还量化了相邻红树林滩涂作为潜在碳库的碳储存能力。然后，选择淡水和养分输入、红树林生物因子和土壤成分作为影响因子，并使用偏最小二乘路径模型（PLS-PM）阐明它们在碳固存中的机制。最后，揭示了环境因子对红树林碳固存的中等值，在此基础上充分讨论了综合作用下碳固存的未来损失和收益模式。结果表明：（1）研究区地上生物量（AGB）和TOC密度分别为32.89 Mg C/hm2和185.10 Mg C/hm2，且均富集于内陆地区。滩涂的固碳量相当于红树林总碳固存量的 >1/5。（2） DTI 是影响固碳模式最关键的因子，通过改变土壤含量（SC）与 AGB 和 TOC 呈正相关，而通过影响冠层密度（CD）与 AGB 和 TOC 呈负相关。CD 和 TP 被确定为重要的预测因子。（3）中位数分析表明，未来的碳“增益”区将移动到近岸，而富含碳的潮间带区可能会发生碳损失。本研究为红树林蓝碳功能管理提供了新的见解和科学认识。

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The spatial patterns and driving mechanisms of blue carbon ‘loss’ and ‘gain’ in a typical mangrove ecosystem: A case study of Beihai, Guangxi Province of China

The role of mangroves in carbon sequestration is critical in mitigating climate change. For better identifying the carbon conservation hotspots of mangroves influenced by environmental factors, the spatial distribution and driving mechanisms of mangrove vegetation and soil carbon sequestration, as well as the future carbon dynamics of mangroves, required clarification. Firstly, we assessed the spatial pattern of vegetation biomass and soil depth-varied soil total organic carbon (TOC) in Xiaoguansha, Guangxi Province of China, and its relationships with duration of inundation (DTI) were explored. Additionally, the carbon storage capacity of adjacent mangrove tidal flats as potential carbon reservoirs was quantified. Thirdly, freshwater, and nutrient inputs, biotic factors of mangrove, and soil composition were selected as impact factors, and their mechanisms in carbon sequestration were elucidated by using Partial least squares path modeling (PLS-PM). Finally, medium values of environmental factors on mangrove carbon sequestration were revealed, based on which future loss and gain patterns of carbon sequestration under the combined effects were fully discussed. The results showed that: (1) The Above-ground biomass (AGB) and TOC densities were 32.89 Mg C/ha and 185.10 Mg C/ha in the study area, and both were enriched in the Interior areas. The carbon sequestration in the tidal flats was equivalented to >1/5 of total carbon sequestration of mangroves. (2) DTI was the most critical factor affecting the carbon sequestration pattern and was found to be positive correlated with AGB and TOC via changing soil contents (SC), whereas it exhibits a negative correlation with AGB and TOC through influencing canopy density (CD). CD and TP were identified as significant predictors. (3) Median analysis indicated that future carbon ‘gain’ area will move nearshore, whereas the carbon-rich intertidal area may undergo carbon loss. This study provided new insights and scientific understanding for management of mangrove blue carbon function.

更新日期：2023-09-21

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