Warming stimulates mangrove carbon sequestration in rising sea level at their northern limit: An in situ simulation

IF 3.8 1区 地球科学 Q1 LIMNOLOGY Limnology and Oceanography Pub Date : 2024-08-06 DOI:10.1002/lno.12655
Peiyang Qiao, Ying Dong, Xiaoxuan Gu, Lian Xu, Mei Li, Wandong Chen, Li Lin, Xiaopin Ni, Luzhen Chen
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Abstract

Global warming and sea-level rise are directly influencing the growth, distribution, and greenhouse gas emissions of mangrove forests. However, mangrove forests growing at their latitudinal limits are relatively susceptible to warming; nevertheless, few studies have focused on GHG emissions of latitudinal limits mangrove forests as related to global climate change. To address this knowledge gap, a multiyear in situ control experiment was established in a restored plantation at the northern distribution limit of Kandelia obovata, the most cold-tolerant mangrove species in China, to simulate both warming and sea-level rise. We investigated the growth patterns and sediment greenhouse gas emissions of a K. obovata population and identified the primary factors contributing to these changes. The results showed that warming and moderate sea-level rise enhanced biomass by more than 18%, indicating that warming stimulated plant growth while excessive sea-level rise inhibited it. The sediment greenhouse gas emissions ranged from 45.5 to 484.6 mgCO2 m−2 h−1, 5.6 to 590.3 μgCH4 m−2 h−1, and 11.4 to 385 μgN2O m−2 h−1, which increased with warming while decreased with sea-level rise, acting as the net source of greenhouse gas emission. Our study predicted that sea-level rise, while directly changing sediment properties, had combined effects with warming on these studied mangrove forests that were predicted to emit more greenhouse gases from sediments in the future. These findings indicated that K. obovata plantations within their latitudinal limits tend to accumulate more CO2 for biomass carbon storage under warming conditions, while stimulating sediment greenhouse gas emissions, which will offset their climate mitigating effect in future climatic scenarios.

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气候变暖刺激红树林在其北部极限海平面上升时固碳:原位模拟
全球变暖和海平面上升直接影响着红树林的生长、分布和温室气体排放。然而,生长在纬度极限的红树林相对容易受到气候变暖的影响;然而,很少有研究关注纬度极限红树林的温室气体排放与全球气候变化的关系。为了填补这一知识空白,我们在中国最耐寒的红树林物种 Kandelia obovata 的北部分布极限的恢复种植园中进行了多年原位对照实验,以模拟气候变暖和海平面上升。我们调查了红豆杉种群的生长模式和沉积物温室气体排放情况,并确定了导致这些变化的主要因素。结果表明,气候变暖和海平面适度上升使生物量增加了18%以上,这表明气候变暖刺激了植物生长,而海平面过度上升则抑制了植物生长。沉积物温室气体排放量为 45.5 至 484.6 mgCO2 m-2 h-1、5.6 至 590.3 μgCH4 m-2 h-1 和 11.4 至 385 μgN2O m-2 h-1,随着气候变暖而增加,随着海平面上升而减少,成为温室气体的净排放源。我们的研究预测,海平面上升在直接改变沉积物性质的同时,还与气候变暖共同作用于所研究的这些红树林,预计未来沉积物将排放更多温室气体。这些研究结果表明,在气候变暖的条件下,K. obovata种植园在其纬度范围内往往会积累更多的二氧化碳用于生物质碳储存,同时刺激沉积物的温室气体排放,这将抵消其在未来气候情景下的气候减缓作用。
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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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