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No isotopic evidence for a differential mineralization of old soil organic matter in sandy, nutrient-poor, tropical soils under eucalypts and acacias

Abstract : An increase in soil N availability by Acacia mangium in pure or mixed-species stands may reduce soil organic matter (SOM) mineralization compared to eucalypt stands. We measured the isotope composition (delta C-13) of coarse particulate organic matter (cPOM, 4-0.25 mm), of fine POM (fPOM, 0.25-0.05 mm) and of the remaining organo-mineral fraction (OMF, <0.05 mm), and of the forest floor in plantations established on a tropical C4-grass savannah. In contrast to our hypothesis, the presence of acacia either alone or in mixture did not impact delta C-13 of the most stable SOM fractions derived from the previous savannah vegetation, which suggests similar rates of native SOM mineralization under acacia and eucalypt trees.
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https://hal.univ-lorraine.fr/hal-01557925
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Submitted on : Thursday, July 6, 2017 - 4:21:35 PM
Last modification on : Tuesday, December 8, 2020 - 9:41:41 AM

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Daniel Epron, Sogni Viviane Tchichelle, Yann Nouvellon, Louis Mareschal, Lydie-Stella Koutika. No isotopic evidence for a differential mineralization of old soil organic matter in sandy, nutrient-poor, tropical soils under eucalypts and acacias. European Journal of Soil Biology, Elsevier, 2016, 76, pp.92 - 94. ⟨10.1016/j.ejsobi.2016.08.003⟩. ⟨hal-01557925⟩

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