Effect of fire regimes on the demographic parameters of the perennial tussock grasses of a humid savanna

Kouamé Fulgence Koffi; Aya Brigitte N'Dri; Jean‐Christophe Lata; Souleymane Konaté; Tharaniya Srikanthasamy; Sarah Konaré; Marcel Konan; Sébastien Barot

doi:10.1111/jvs.12788

journal article Sep 01, 2019

Effect of fire regimes on the demographic parameters of the perennial tussock grasses of a humid savanna

Aya Brigitte N'Dri Jean‐Christophe Lata Souleymane Konaté Tharaniya Srikanthasamy Sarah Konaré Marcel Konan Sébastien Barot

Journal of Vegetation Science Vol. 30 No. 5 pp. 950-962 · Wiley

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Abstract

AbstractQuestionsPerennial tussock grasses represent the principal fuel source for savanna fires; however, basic information about the impact of fire on their demography remains scarce. Do dominant perennial grass species differ in their demographic parameters? What is the overall impact of tussock circumference and fire regimes on grass demographic parameters? Do grass species differ in the sensitivity of their demographic parameters to fire regimes and tussock circumference?LocationThe study site is located in the savanna of the Lamto reserve, in the center of Ivory Coast (6°9′ to 6°18′ N, 5°15′ to 4°57′ E).MethodsData on the nine dominant species of tussock grasses were sampled over one year under four fire treatments (early fire, mid‐season fire, late fire and no fire). We studied the impact of these fire treatments and tussock circumference on five demographic parameters: mortality, fragmentation (the division of a tussock into several smaller ones), growth, retrogression (the decrease in tussock size) and fecundity.ResultsAll demographic parameters varied among species and across the fire regimes. Late fire had the largest negative effect on all parameters except fecundity. Schizachyrium platyphyllum was the most disadvantaged species by fire in terms of mortality, retrogression and growth, whilst Andropogon ascinodis was the most prone to fragmentation. Hyparrhenia smithiana and Sorghastrum bipennatum produced the most seeds and Brachiaria brachylopha produced the most new tussocks. The circumference of perennial grasses impacted all demographic parameters. Small individuals had the highest mortality and growth rates, while large individuals showed the highest fragmentation and retrogression rates, and produced the most seeds.ConclusionsThis study showed that perennial grass species differed in their sensitivity to fire treatments. Nevertheless, the mid‐season fire could be advised to managers for the sustainable management of the Lamto savanna.

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Details

Published: Sep 01, 2019
Vol/Issue: 30(5)
Pages: 950-962
License: View

Authors

K

Kouamé Fulgence Koffi

UFR des Sciences de la Nature Laboratoire d'Ecologie et Développement Durable (LEDD) Université Nangui Abrogoua Abidjan Côte d'Ivoire; UMR 7618 IEES‐Paris (IRD, CNRS, Université Paris Diderot, UPEC, INRA) Sorbonne Université Paris France

A

Aya Brigitte N'Dri

UFR des Sciences de la Nature Laboratoire d'Ecologie et Développement Durable (LEDD) Université Nangui Abrogoua Abidjan Côte d'Ivoire

J

Jean‐Christophe Lata

UMR 7618 IEES‐Paris (IRD, CNRS, Université Paris Diderot, UPEC, INRA) Sorbonne Université Paris France; Department of Geoecology and Geochemistry Institute of Natural Resources Tomsk Polytechnic University Tomsk Russia

S

Souleymane Konaté

UFR des Sciences de la Nature Laboratoire d'Ecologie et Développement Durable (LEDD) Université Nangui Abrogoua Abidjan Côte d'Ivoire

T

Tharaniya Srikanthasamy

UMR 7618 IEES‐Paris (IRD, CNRS, Université Paris Diderot, UPEC, INRA) Sorbonne Université Paris France

S

Sarah Konaré

UMR 7618 IEES‐Paris (IRD, CNRS, Université Paris Diderot, UPEC, INRA) Sorbonne Université Paris France

M

Marcel Konan

UFR des Sciences de la Nature Laboratoire d'Ecologie et Développement Durable (LEDD) Université Nangui Abrogoua Abidjan Côte d'Ivoire

S

Sébastien Barot

UMR 7618 IEES‐Paris (IRD, CNRS, Université Paris Diderot, UPEC, INRA) Sorbonne Université Paris France

Funding

Département Soutien et Formation, Institut de Recherche pour le Développement

Cite This Article

Kouamé Fulgence Koffi, Aya Brigitte N'Dri, Jean‐Christophe Lata, et al. (2019). Effect of fire regimes on the demographic parameters of the perennial tussock grasses of a humid savanna. Journal of Vegetation Science, 30(5), 950-962. https://doi.org/10.1111/jvs.12788

Effect of fire regimes on the demographic parameters of the perennial tussock grasses of a humid savanna

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