Relationships among litterfall, fine-root growth, and soil respiration for five tropical tree species
Abstract
Although significant advances have been made in understanding terrestrial carbon cycling, there is still a large uncertainty about the variability of carbon (C) fluxes at local scales. Using a carbon mass-balance approach, I investigated the relationships between fine detritus production and soil respiration for five tropical tree species established on 16-year-old plantations. Total fine detritus production ranged from 0.69 to 1.21 kg C·m–2·year–1 with significant differences among species but with no correlation between litterfall and fine-root growth. Soil CO2 emissions ranged from 1.61 to 2.36 kg C·m–2·year–1 with no significant differences among species. Soil respiration increased with fine-root production but not with litterfall, suggesting that soil C emissions may depend more on belowground inputs or that both fine root production and soil respiration are similarly influenced by an external factor. Estimates of root + rhizosphere respiration comprised 52% of total soil respiration on average, and there was no evidence that rhizosphere respiration was associated with fine-root growth rates among species. These results suggest that inherent differences in fine-root production among species, rather than differences in aboveground litterfall, might play a main role explaining local-scale, among-forest variations in soil C emissions.
Résumé
Bien que des progrès importants aient été réalisés en ce qui a trait à la compréhension du recyclage du carbone terrestre, beaucoup d’incertitude persiste au sujet de la variabilité des flux de carbone à l’échelle locale. À l’aide d’une approche de bilan de masse du carbone, nous avons étudié les relations entre la production de débris fins et la respiration du sol associées à cinq espèces tropicales d’arbres établies dans des plantations âgées de 16 ans. La production totale de débris fins variait de 0,69 à 1,21 kg C·m–2·an–1 et il y avait des différences significatives entre les espèces mais pas de corrélation entre la chute de litière et la croissance des racines fines. Les émissions de CO2 du sol variaient de 1,61 à 2,36 kg C·m–2·an–1 et il n’y avait aucune différence significative entre les espèces. La respiration du sol augmentait avec la production de racines fines, mais pas avec la chute de litière, ce qui indique que les émissions de C du sol pourraient dépendre davantage des apports souterrains ou que tant la production de racines fines que la respiration du sol seraient influencées de façon similaire par un facteur externe. Les estimations de la respiration des racines et de la rhizosphère représentaient en moyenne 52 % de la respiration totale du sol et il n’y avait par d’indices que la respiration de la rhizosphère était associée au taux de croissance des racines fines des différentes espèces. Ces résultats indiquent que des différences dans la production de racines fines inhérentes à chaque espèce, plutôt que des différences dans la chute de litière en surface, pourraient être le principal facteur permettant d’expliquer la variation à l’échelle locale des émissions de C du sol entre les forêts.
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Canadian Journal of Forest Research
Volume 37 • Number 10 • October 2007
Pages: 1954 - 1965
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Received: 11 October 2006
Accepted: 8 March 2007
Published online: 19 October 2007
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Oscar J.Valverde-BarrantesO.J. Valverde-Barrantes. 2007. Relationships among litterfall, fine-root growth, and soil respiration for five tropical tree species. Canadian Journal of Forest Research.
37(10): 1954-1965. https://doi.org/10.1139/X07-057
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