Leaf decomposition in two semi-evergreen tropical forests: influence of litter qualityReportar como inadecuado




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* Corresponding author 1 UMR BIOSOL 137 - Biodiversité et fonctionnement des sols 2 Laboratoire d-Ecologie Générale 3 DYNECAR EA 926 - Dynamique des écosystèmes Caraïbe et biologie des espèces associées

Abstract : Decomposition processes in tropical semi-evergreen forests are still poorly understood. The influence of soil properties and litter quality on decomposition rate was studied in two semi-evergreen forests of Guadeloupe, a forest plantation and a secondary forest, located on different soils. Leaf litter of four tree species was enclosed in litterbags for a 14-month period. Nonlinear correlations were calculated between mass loss and the concentration of major leaf components soluble C, N, lignin, cellulose, tannins, total soluble phenols in order to determine the best predictor of leaf litter decomposition. Soil physico-chemical properties and ratios between some of the above-mentioned litter quality parameters were also examined as mass loss predictors. In addition, non-linear correlations were calculated between mass loss and litter quality parameters, at successive periods. Litter quality was the main determinant of litter decomposition in the studied forests. Several litter quality parameters were correlated with leaf disappearance, varying according to stages of decomposition. Between 1 month and 2.5 months, the mass loss was correlated negatively with the initial phenol content and with initial lignin:N and lignin+phenol:N ratios. From 2.5 to 5.5 months, the mass loss was correlated negatively with the initial phenol content and positively with the initial cellulose content. At later stages of decomposition 9-14 months, the mass loss was correlated negatively with the initial tannin content. Differences in soil characteristics and fauna did not seem to be enough to affect decomposition.

keyword : Litter decomposition Litter quality Litterbags Semi-evergreen tropical forests





Autor: Gladys Loranger - Jean-François Ponge - Daniel Imbert - Patrick Lavelle -

Fuente: https://hal.archives-ouvertes.fr/



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