Resilience and restoration of tropical and subtropical grasslands, savannas, and grassy woodlands

[en] Despite growing recognition of the conservation values of grassy biomes, our understanding of how to maintain and restore biodiverse tropical grasslands (including savannas and open-canopy grassy woodlands) remains limited. To incorporate grasslands into large-scale restoration efforts, we synthesised existing ecological knowledge of tropical grassland resilience and approaches to plant community restoration. Tropical grassland plant communities are resilient to, and often dependent on, the endogenous disturbances with which they evolved – frequent fires and native megafaunal herbivory. In stark contrast, tropical grasslands are extremely vulnerable to human-caused exogenous disturbances, particularly those that alter soils and destroy belowground biomass (e.g. tillage agriculture, surface mining); tropical grassland restoration after severe soil disturbances is expensive and rarely achieves management targets. Where grasslands have been degraded by altered disturbance regimes (e.g. fire exclusion), exotic plant invasions, or afforestation, restoration efforts can recreate vegetation structure (i.e. historical tree density and herbaceous ground cover), but species-diverse plant communities, including endemic species, are slow to recover. Complicating plant-community restoration efforts, many tropical grassland species, particularly those that invest in underground storage organs, are difficult to propagate and re-establish. To guide restoration decisions, we draw on the old-growth grassland concept, the novel ecosystem concept, and theory regarding tree cover along resource gradients in savannas to propose a conceptual framework that classifies tropical grasslands into three broad ecosystem states. These states are: (1) old-growth grasslands (i.e. ancient, biodiverse grassy ecosystems), where management should focus on the maintenance of disturbance regimes; (2) hybrid grasslands, where restoration should emphasise a return towards the old-growth state; and (3) novel ecosystems, where the magnitude of environmental change (i.e. a shift to an alternative ecosystem state) or the socioecological context preclude a return to historical conditions. © 2018 Cambridge Philosophical Society

Disciplines :

Environmental sciences & ecology

Author, co-author :

Buisson, E.; Institut Méditerranéen de Biodiversité et d'Ecologie marine et continentale (IMBE), Université d'Avignon et des Pays de Vaucluse, CNRS, IRD, Aix Marseille Université, Agroparc BP61207, Avignon cedex 9, 84911, France

Le Stradic, S.; Gembloux Agro-Bio Tech, Biodiversity and Landscape unit, University of Liege, Gembloux, 5030, Belgium, Universidade Estadual Paulista (UNESP), Instituto de Biociências, Departamento de Botânica, Lab of Vegetation Ecology, Av. 24A, 1515, Rio Claro, SP 13506-900, Brazil

Silveira, F. A. O.; Departamento de Botânica, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30161-901, Brazil

Durigan, G.; Laboratório de Ecologia e Hidrologia Florestal, Floresta Estadual de Assis, Instituto Florestal, PO box 104, Assis, SP 19802-970, Brazil

Overbeck, G. E.; Departamento de Botânica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501-970, Brazil

Fidelis, A.; Universidade Estadual Paulista (UNESP), Instituto de Biociências, Departamento de Botânica, Lab of Vegetation Ecology, Av. 24A, 1515, Rio Claro, SP 13506-900, Brazil

Fernandes, G. W.; Ecologia Evolutiva e Biodiversidade, Universidade Federal de Minas Gerais, Belo Horizonte, MG 30161-901, Brazil

Bond, W. J.; Department of Biological Sciences, University of Cape Town and South African Environmental Observation Network, NRF, Rondebosch, 7701, South Africa

Hermann, J.-M.; Restoration Ecology, Center of Life and Food Sciences Weihenstephan, Technische Universität München – TUM, Freising, Germany

Mahy, Grégory ; Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Biodiversité et Paysage

More authors (3 more)

Language :

English

Title :

Resilience and restoration of tropical and subtropical grasslands, savannas, and grassy woodlands

Publication date :

2019

Journal title :

Biological Reviews

ISSN :

1464-7931

eISSN :

1469-185X

Publisher :

Wiley

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 07 November 2018

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