Mulching is an effective treatment of post-fire soil erosion. However, little is known concerning its effects on soil organic matter (SOM) composition and properties. This study evaluated the long-term effects of forest residue mulch on the molecular composition of humic acids from a burnt eucalypt plantation in central Portugal. Mulching treatment increased the abundance of organic carbon and humics acids extracted five years after the wildfire. The molecular composition of soil samples indicated that mulching may help the recovery of the most labile fractions of fire affected soils. In addition, the composition of the HA extracted from both mulched and untreated fire affected plots was very similar.

J. M. De la Rosa thanks the Spanish Ministry of Economy and Competitiveness (MINECO) for his “Ramón y Cajal” contract. The study was partially supported by the projects CGL2016-78937-R funded by MINECO and AEI/FEDER EU, and PTDC/AGRCFL/104559/2008 funded by FCT Portugal. The authors also recognize D. Monis and A. Sanchez for their support with analyses and the soil erosion crew of CESAM for their help in the field.

2 páginas.-- 1 figura.-- 1 tablas.-- 6 referencias..-- Pópter presentado 9th International Conference of Humic Substances and their Contribution to the Climate Change Mitigation 16–21 September 2018 Albena, Bulgaria

El libro completo de las actas se puede desgargar en la url: http://www.ihss2018.org/files/files/19%20IC%20of%20Humic%20Substances%20and%20their%20Contribution%20to%20the%20Climate%20Change%20Mitigation.pdf

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