Staff View: Blue carbon sink capacity of mangroves determined by leaves and their associated microbiome

Blue carbon sink capacity of mangroves determined by leaves and their associated microbiome

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 micr...

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Main Authors:	Lu, Zhe, Qin, Guoming, Gan, Shuchai, Liu, Hongbin, Macreadie, Peter I., Cheah, Wee, Wang, Faming
Format:	Article
Published:	John Wiley and Sons Inc 2024
Subjects:	Q Science (General)
Online Access:	http://eprints.um.edu.my/45024/
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spelling	my.um.eprints.450242024-03-26T02:58:06Z http://eprints.um.edu.my/45024/ Blue carbon sink capacity of mangroves determined by leaves and their associated microbiome Lu, Zhe Qin, Guoming Gan, Shuchai Liu, Hongbin Macreadie, Peter I. Cheah, Wee Wang, Faming Q Science (General) 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. John Wiley and Sons Inc 2024 Article PeerReviewed 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 <https://doi.org/10.1111/gcb.17007>. 10.1111/gcb.17007
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
topic	Q Science (General)
spellingShingle	Q Science (General) Lu, Zhe Qin, Guoming Gan, Shuchai Liu, Hongbin Macreadie, Peter I. Cheah, Wee Wang, Faming Blue carbon sink capacity of mangroves determined by leaves and their associated microbiome
description	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.
format	Article
author	Lu, Zhe Qin, Guoming Gan, Shuchai Liu, Hongbin Macreadie, Peter I. Cheah, Wee Wang, Faming
author_facet	Lu, Zhe Qin, Guoming Gan, Shuchai Liu, Hongbin Macreadie, Peter I. Cheah, Wee Wang, Faming
author_sort	Lu, Zhe
title	Blue carbon sink capacity of mangroves determined by leaves and their associated microbiome
title_short	Blue carbon sink capacity of mangroves determined by leaves and their associated microbiome
title_full	Blue carbon sink capacity of mangroves determined by leaves and their associated microbiome
title_fullStr	Blue carbon sink capacity of mangroves determined by leaves and their associated microbiome
title_full_unstemmed	Blue carbon sink capacity of mangroves determined by leaves and their associated microbiome
title_sort	blue carbon sink capacity of mangroves determined by leaves and their associated microbiome
publisher	John Wiley and Sons Inc
publishDate	2024
url	http://eprints.um.edu.my/45024/
_version_	1794633292857737216
score	13.211869

Blue carbon sink capacity of mangroves determined by leaves and their associated microbiome

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