Key Laboratory of Humid Subtropical Ecological-Geographical Processes, Ministry of Education, Fujian Normal University, Fuzhou, Fujian 350117, China.
Key Laboratory of Humid Subtropical Ecological-Geographical Processes, Ministry of Education, Fujian Normal University, Fuzhou, Fujian 350117, China.
Sci Total Environ. 2024 Nov 15;951:175586. doi: 10.1016/j.scitotenv.2024.175586. Epub 2024 Aug 21.
Mangrove wetlands are highly productive ecosystems in tropical and subtropical coastal zones, play crucial roles in water purification, biodiversity maintenance, and carbon sequestration. Recent years have seen the implementation of pond return initiatives, which have facilitated the gradual recovery of mangrove areas in China. However, the implications of these initiatives for soil aggregate stability, microbial community structure, and network interactions remain unclear. This study assesses the impacts of converting ponds to mangroves-both in natural and artificially restored settings-on soil aggregate stability and microbial networks at typical mangrove restoration sites along China's southeastern coast. Our observations confirmed our hypothesis that pond-to-mangrove conversions resulted in an increase in the proportion of large aggregates (>0.25 mm), improved soil aggregate structural stability, and increased carbon sequestration. However, mangrove recovery led to a decrease in the abundance and diversity of soil fungi communities. In terms of co-occurrence networks, naturally restored mangrove wetlands exhibited more nodes and edges. The naturally recovered mangrove wetlands demonstrated a higher level of community symbiosis compared to those that were manually restored. Conversely, bacterial networks showed a different pattern, with significant shifts in key taxa related to carbon sequestration functions. For instance, the proportion of bacterial Desulfobacterota and fungi Basidiomycota in natural recovery mangrove increased by 15.03 % and 7.82 %, respectively, compared with that in aquaculture ponds. Soil fungi and bacteria communities, as well as carbon sequestration by aggregates, were all positively correlated with soil total carbon content (P < 0.05). Both bacterial and fungal communities contributed to soil aggregate stability. Our study highlights the complex relationships between soil microbial communities, aggregate stability, and the carbon cycle before and after land-use changes. These findings underscore the potential benefits of restoring mangrove wetlands, as such efforts can enhance carbon storage capacity and significantly contribute to climate change mitigation.
红树林湿地是热带和亚热带沿海地区具有高生产力的生态系统，在水净化、生物多样性维护和碳固存方面发挥着关键作用。近年来，实施了池塘回归倡议，这有助于中国红树林地区的逐步恢复。然而，这些倡议对土壤团聚体稳定性、微生物群落结构和网络相互作用的影响尚不清楚。本研究评估了将池塘转化为红树林（包括自然和人工恢复）对中国东南沿海典型红树林恢复地点土壤团聚体稳定性和微生物网络的影响。我们的观察结果证实了我们的假设，即池塘到红树林的转化导致大团聚体（>0.25 毫米）的比例增加，改善了土壤团聚体结构稳定性，并增加了碳固存。然而，红树林恢复导致土壤真菌群落的丰度和多样性下降。就共现网络而言，自然恢复的红树林湿地具有更多的节点和边缘。与人工恢复的红树林湿地相比，自然恢复的红树林湿地表现出更高的群落共生水平。相反，细菌网络呈现出不同的模式，与碳固存功能相关的关键分类群发生了显著变化。例如，与水产养殖池塘相比，自然恢复的红树林中细菌脱硫杆菌和真菌担子菌的比例分别增加了 15.03%和 7.82%。土壤真菌和细菌群落以及团聚体的碳固存与土壤总碳含量呈正相关（P<0.05）。细菌和真菌群落都有助于土壤团聚体稳定性。本研究强调了土地利用变化前后土壤微生物群落、团聚体稳定性和碳循环之间的复杂关系。这些发现突显了恢复红树林湿地的潜在好处，因为这些努力可以增强碳储存能力，并为气候变化缓解做出重大贡献。
