Lu, Zhe and Qin, Guoming and Gan, Shuchai and Liu, Hongbin and Macreadie, Peter I. and Cheah, Wee and Wang, Faming (2024) Blue carbon sink capacity of mangroves determined by leaves and their associated microbiome. Global Change Biology, 30 (1). ISSN 1354-1013, DOI https://doi.org/10.1111/gcb.17007.
Full text not available from this repository.Abstract
Mangroves play a globally significant role in carbon capture and storage, known as blue carbon ecosystems. Yet, there are fundamental biogeochemical processes of mangrove blue carbon formation that are inadequately understood, such as the mechanisms by which mangrove afforestation regulates the microbial-driven transfer of carbon from leaf to below-ground blue carbon pool. In this study, we addressed this knowledge gap by investigating: (1) the mangrove leaf characteristics using state-of-the-art FT-ICR-MS; (2) the microbial biomass and their transformation patterns of assimilated plant-carbon; and (3) the degradation potentials of plant-derived carbon in soils of an introduced (Sonneratia apetala) and a native mangrove (Kandelia obovata). We found that biogeochemical cycling took entirely different pathways for S. apetala and K. obovata. Blue carbon accumulation and the proportion of plant-carbon for native mangroves were high, with microbes (dominated by K-strategists) allocating the assimilated-carbon to starch and sucrose metabolism. Conversely, microbes with S. apetala adopted an r-strategy and increased protein- and nucleotide-biosynthetic potentials. These divergent biogeochemical pathways were related to leaf characteristics, with S. apetala leaves characterized by lower molecular-weight, C:N ratio, and lignin content than K. obovata. Moreover, anaerobic-degradation potentials for lignin were high in old-aged soils, but the overall degradation potentials of plant carbon were age-independent, explaining that S. apetala age had no significant influences on the contribution of plant-carbon to blue carbon. We propose that for introduced mangroves, newly fallen leaves release nutrient-rich organic matter that favors growth of r-strategists, which rapidly consume carbon to fuel growth, increasing the proportion of microbial-carbon to blue carbon. In contrast, lignin-rich native mangrove leaves shape K-strategist-dominated microbial communities, which grow slowly and store assimilated-carbon in cells, ultimately promoting the contribution of plant-carbon to the remarkable accumulation of blue carbon. Our study provides new insights into the molecular mechanisms of microbial community responses during reforestation in mangrove ecosystems. © 2023 John Wiley & Sons Ltd.
| Item Type: | Article |
|---|---|
| Funders: | 2023 Natural Resources Affairs Management-Ecological Forestry Construction Special Project of Forestry Administration of Guangdong Province [Grant no. 2022‐8], ANSO collaborative research, R & D program of Guangdong Provincial Department of Science and Technology [Grant no. 2018B030324003] |
| Uncontrolled Keywords: | Biogeochemistry; Blue carbon; Carbon cycling; Coastal ecosystem; FT-ICR-MS; Functional potential; Mangrove restoration; Metagenome sequencing; Microbial biomass; Microbiome |
| Subjects: | Q Science > Q Science (General) |
| Divisions: | Deputy Vice Chancellor (Research & Innovation) Office > Institute of Ocean and Earth Sciences |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 26 Mar 2024 02:58 |
| Last Modified: | 26 Mar 2024 02:58 |
| URI: | http://eprints.um.edu.my/id/eprint/45024 |
Actions (login required)
 |
View Item |
