PotvinMancillaBuchmannEtAl2011

Référence

Potvin, C., Mancilla, L., Buchmann, N., Monteza, J., Moore, T., Murphy, M., Oelmann, Y., Scherer-Lorenzen, M., Turner, B.L., Wilcke, W., Zeugin, F., Wolf, S. (2011) An ecosystem approach to biodiversity effects: Carbon pools in a tropical tree plantation. Forest Ecology and Management, 261(10):1614-1624. (Scopus )

Résumé

This paper presents a synthesis of experiments conducted in a tropical tree plantation established in 2001 and consisting of 22 plots of 45m×45m with either one, three or six native tree species. We examined the changes in carbon (C) pools (trees, herbaceous vegetation, litter, coarse woody debris (CWD), and mineral topsoil at 0-10cm depth) and fluxes (decomposition of CWD and litter, as well as soil respiration) both through time and among diversity levels. Between 2001 and 2009 the aboveground C pools increased, driven by trees. Across diversity levels, the mean observed aboveground C pool was 7.9±2.5Mgha-1 in 2006 and 20.4±7.4Mgha-1 in 2009, a 158% increase. There was no significant diversity effect on the observed aboveground C pool, but we found a significant decrease in the topsoil C pool, with a mean value of 34.5±2.4Mgha-1 in 2001 and of 25.7±5.7Mgha-1 in 2009 (F1,36=52.12, p<0.001). Assuming that the biomass C pool in 2001 was negligible (<1Mgha-1), then the plantation gained in C, on average, ∼20 and lost ∼9Mgha-1 in biomass and soil respectively, for an overall gain of ∼11Mgha-1 over 8 years. Across the entire data set, we uncovered significant effects of diversity on CWD decomposition (diversity: F2,393=15.93, p<0.001) and soil respiration (monocultures vs mixtures: t=15.35, df=11, p<0.05) and a marginally significant time×diversity interaction on the loss of total C from the mineral topsoil pool (see above). Monthly CWD decomposition was significantly faster in monocultures (35.0±24.1%) compared with triplets (31.3±21.0%) and six-species mixtures (31.9±26.8%), while soil respiration was higher in monocultures than in mixtures (t=15.35, df=11, p<0.001). Path analyses showed that, as diversity increases, the links among the C pools and fluxes strengthen significantly. Our results demonstrate that tree diversity influences the processes governing the changes in C pools and fluxes following establishment of a tree plantation on a former pasture. We conclude that the choice of tree mixtures for afforestation in the tropics can have a marked influence on C pools and dynamics. © 2010 Elsevier B.V.

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@ARTICLE { PotvinMancillaBuchmannEtAl2011,
    AUTHOR = { Potvin, C. and Mancilla, L. and Buchmann, N. and Monteza, J. and Moore, T. and Murphy, M. and Oelmann, Y. and Scherer-Lorenzen, M. and Turner, B.L. and Wilcke, W. and Zeugin, F. and Wolf, S. },
    TITLE = { An ecosystem approach to biodiversity effects: Carbon pools in a tropical tree plantation },
    JOURNAL = { Forest Ecology and Management },
    YEAR = { 2011 },
    VOLUME = { 261 },
    PAGES = { 1614-1624 },
    NUMBER = { 10 },
    ABSTRACT = { This paper presents a synthesis of experiments conducted in a tropical tree plantation established in 2001 and consisting of 22 plots of 45m×45m with either one, three or six native tree species. We examined the changes in carbon (C) pools (trees, herbaceous vegetation, litter, coarse woody debris (CWD), and mineral topsoil at 0-10cm depth) and fluxes (decomposition of CWD and litter, as well as soil respiration) both through time and among diversity levels. Between 2001 and 2009 the aboveground C pools increased, driven by trees. Across diversity levels, the mean observed aboveground C pool was 7.9±2.5Mgha-1 in 2006 and 20.4±7.4Mgha-1 in 2009, a 158% increase. There was no significant diversity effect on the observed aboveground C pool, but we found a significant decrease in the topsoil C pool, with a mean value of 34.5±2.4Mgha-1 in 2001 and of 25.7±5.7Mgha-1 in 2009 (F1,36=52.12, p<0.001). Assuming that the biomass C pool in 2001 was negligible (<1Mgha-1), then the plantation gained in C, on average, ∼20 and lost ∼9Mgha-1 in biomass and soil respectively, for an overall gain of ∼11Mgha-1 over 8 years. Across the entire data set, we uncovered significant effects of diversity on CWD decomposition (diversity: F2,393=15.93, p<0.001) and soil respiration (monocultures vs mixtures: t=15.35, df=11, p<0.05) and a marginally significant time×diversity interaction on the loss of total C from the mineral topsoil pool (see above). Monthly CWD decomposition was significantly faster in monocultures (35.0±24.1%) compared with triplets (31.3±21.0%) and six-species mixtures (31.9±26.8%), while soil respiration was higher in monocultures than in mixtures (t=15.35, df=11, p<0.001). Path analyses showed that, as diversity increases, the links among the C pools and fluxes strengthen significantly. Our results demonstrate that tree diversity influences the processes governing the changes in C pools and fluxes following establishment of a tree plantation on a former pasture. We conclude that the choice of tree mixtures for afforestation in the tropics can have a marked influence on C pools and dynamics. © 2010 Elsevier B.V. },
    COMMENT = { Cited By (since 1996): 1 Export Date: 13 May 2011 Source: Scopus CODEN: FECMD doi: 10.1016/j.foreco.2010.11.015 },
    ISSN = { 03781127 (ISSN) },
    KEYWORDS = { Carbon pools and fluxes, Diversity effect, Ecosystem carbon storage, Tropical tree plantation },
    OWNER = { Luc },
    TIMESTAMP = { 2011.05.13 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-79954578325&partnerID=40&md5=689b1282bd356dfb79dcd773a187bc85 },
}

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