Short-term impact of fire on the total soil microbial and nitrifier communities in a wet savanna.

Autor: Srikanthasamy T; Sorbonne Université, Université de Paris UPEC CNRS INRAE IRD UMR 7618 Institute of Ecology and Environmental Sciences - Paris, iEES Paris Paris France., Barot S; IRD Sorbonne Université CNRS INRAE Université de Paris UPEC UMR 7618 Institute of Ecology and Environmental Sciences - Paris, iEES-Paris Paris France., Koffi FK; UFR-SN / Research Station of Lamto (CRE) Research Pole Environment and Sustainable Development, Nangui Abrogoua University (ex University of Abobo-Adjamé), Abidjan, Côte d'Ivoire Abidjan Ivory Coast., Tambosco K; Sorbonne Université, Université de Paris UPEC CNRS INRAE IRD UMR 7618 Institute of Ecology and Environmental Sciences - Paris, iEES Paris Paris France., Marcangeli Y; Sorbonne Université, Université de Paris UPEC CNRS INRAE IRD UMR 7618 Institute of Ecology and Environmental Sciences - Paris, iEES Paris Paris France., Carmignac D; Sorbonne Université, Université de Paris UPEC CNRS INRAE IRD UMR 7618 Institute of Ecology and Environmental Sciences - Paris, iEES Paris Paris France., N'Dri AB; UFR-SN / Research Station of Lamto (CRE) Research Pole Environment and Sustainable Development, Nangui Abrogoua University (ex University of Abobo-Adjamé), Abidjan, Côte d'Ivoire Abidjan Ivory Coast., Gervaix J; INRA CNRS Université de Lyon Université Lyon 1 Laboratoire d'Ecologie Microbienne UMR INRA 1418 UMR CNRS 5557 Villeurbanne France., Le Roux X; INRA CNRS Université de Lyon Université Lyon 1 Laboratoire d'Ecologie Microbienne UMR INRA 1418 UMR CNRS 5557 Villeurbanne France., Lata JC; Sorbonne Université, Université de Paris UPEC CNRS INRAE IRD UMR 7618 Institute of Ecology and Environmental Sciences - Paris, iEES Paris Paris France.; Department of Geoecology and Geochemistry Institute of Natural Resources Tomsk Polytechnic University Tomsk Russia.
Jazyk: angličtina
Zdroj: Ecology and evolution [Ecol Evol] 2021 Jul 01; Vol. 11 (15), pp. 9958-9969. Date of Electronic Publication: 2021 Jul 01 (Print Publication: 2021).
DOI: 10.1002/ece3.7661
Abstrakt: Savannas are characterized by the coexistence of grasses and trees. Fires are critical for their coexistence, because they decrease the survival of tree seedlings and saplings and their recruitment to the adult stage. In some humid savannas, perennial grasses inhibit nitrification and trees stimulate nitrification, which likely favors coexistence between trees and grasses. However, fires may influence plant capacity to control nitrogen cycling, which could subsequently influence tree-grass coexistence and savanna nitrogen budget. Therefore, we sampled soil in a humid savanna of Ivory Coast under the dominant nitrification-inhibiting grass species and the dominant nitrification-stimulating tree species and under bare soil before and after (i.e., 5 days) fire during the long dry season. We quantified the total microbial and nitrifier abundances and transcriptional activities and the nitrification enzyme activity. Fire decreased soil water content, probably by increasing evaporation and, maybe, by triggering the growth of grasses, and increased soil ammonium availability likely due to ash deposition and increased mineralization. Fire did not impact the total archaeal, bacterial, or fungal abundances, or that of the nitrifiers. Fire did not impact archaeal transcriptional activity and increased bacterial and fungal total transcriptional activities. In contrast, fire decreased the archaeal nitrifier transcriptional activities and the nitrification enzymatic activity, likely due to the often reported resumption of the growth of nitrification-inhibiting grasses quickly after the fire (and the subsequent increase in root exudation). These results pave the way for a better understanding of the short-term effects of fire on nitrogen cycling and tree-grass competition for nitrogen.
Competing Interests: The authors declare that they have no conflicts of interest.
(© 2021 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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