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Soil Respiration and Belowground Carbon Allocation in Mangrove Forests

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Abstract

Mangrove forests cover large areas of tropical and subtropical coastlines. They provide a wide range of ecosystem services that includes carbon storage in above- and below ground biomass and in soils. Carbon dioxide (CO2) emissions from soil, or soil respiration is important in the global carbon budget and is sensitive to increasing global temperature. To understand the magnitude of mangrove soil respiration and the influence of forest structure and temperature on the variation in mangrove soil respiration I assessed soil respiration at eleven mangrove sites, ranging from latitude 27°N to 37°S. Mangrove soil respiration was similar to those observed for terrestrial forest soils. Soil respiration was correlated with leaf area index (LAI) and aboveground net primary production (litterfall), which should aid scaling up to regional and global estimates of soil respiration. Using a carbon balance model, total belowground carbon allocation (TBCA) per unit litterfall was similar in tall mangrove forests as observed in terrestrial forests, but in scrub mangrove forests TBCA per unit litter fall was greater than in terrestrial forests, suggesting mangroves allocate a large proportion of their fixed carbon below ground under unfavorable environmental conditions. The response of soil respiration to soil temperature was not a linear function of temperature. At temperatures below 26°C Q10 of mangrove soil respiration was 2.6, similar to that reported for terrestrial forest soils. However in scrub forests soil respiration declined with increasing soil temperature, largely because of reduced canopy cover and enhanced activity of photosynthetic benthic microbial communities.

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Acknowledgments

This study was supported by the National Science Foundation under Grant DEB 99–81309, a WISC award from the American Association for the Advancement of Science, the New Zealand Foundation for Research, Science and Technology (C01X0024, C01X0215, and C01X0307), the Hunterdon Oceanographic Research Fund, the Smithsonian’s Marine Science Network, the Smithsonian Marine Station at Fort Pierce, the Caribbean Coral Reef Ecosystems Program (contribution no: 818) and Australian Research Council awards LP0561498 and DP0774491. I thank Candy Feller, Roger Ruess, and Marilyn Ball, and the staff of Carrie Bow Cay Research Station and Pelican Beach Resort, Belize. Thanks also to Gary Raulerson who provided access to unpublished data. Thanks are also extended to many people who helped in the field, including Fernanda Adame, Dianne Allen, Don Cahoon, Anne Chamberlain, Beth Clegg, Bettina Engelbrecht, Sharon Ewe, Ray Feller, Jane Halliday, Nicole Hancock, Helen Penrose, Brian Sorrell, Ann Maree Schwarz, and Rachel Tenni.

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  1. Centre for Marine Studies and School of Integrative Biology, University of Queensland, St Lucia, Queensland, 4072, Australia

    Catherine E. Lovelock

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Lovelock, C.E. Soil Respiration and Belowground Carbon Allocation in Mangrove Forests. Ecosystems 11, 342–354 (2008). https://doi.org/10.1007/s10021-008-9125-4

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