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Mangrove ecosystems, situated at the land-sea interface, serve as vital blue carbon sinks, playing a key role in the global carbon cycle and climate regulation with their efficient carbon sequestration capacity. Microorganisms are central drivers of carbon sequestration in mangrove sediments, capable of fixing carbon through diverse metabolic pathways. This review first summarizes the currently identified microbial carbon fixation pathways and carbon sequestration mechanisms in mangrove sediments, with a focus on three primary processes: the Calvin-Benson-Bassham cycle, the reductive tricarboxylic acid cycle, and the reductive acetyl-CoA (Wood-Ljungdahl) pathway. Furthermore, we discuss the influences of key environmental factors, such as vegetation type, sediment physicochemical properties, and nutrient inputs, on microbial carbon fixation and sequestration. Finally, we propose the future directions for studies on microbial carbon fixation and sequestration in mangrove sediments, including the couplings of nutrient cycling processes, microbiome engineering, and microorganism-plant interactions. This review proposes potential novel strategies for enhancing blue carbon capacity in mangrove ecosystems.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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