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Intermediate tree cover can maximize groundwater recharge in the seasonally dry tropics
Department of Forest Ecology and Management, Swedish University of Agricultural Sciences—SLU.
Department of Forest Ecology and Management, Swedish University of Agricultural Sciences—SLU.
Institut de l'Environnement et de Recherches Agricoles, Departement Productions.
World Agroforestry Centre (ICRAF), West and Central Africa Regional Office, Sahel.
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2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, article id 21930Article in journal (Refereed) Published
Abstract [en]

Water scarcity contributes to the poverty of around one-third of the world's people. Despite many benefits, tree planting in dry regions is often discouraged by concerns that trees reduce water availability. Yet relevant studies from the tropics are scarce, and the impacts of intermediate tree cover remain unexplored. We developed and tested an optimum tree cover theory in which groundwater recharge is maximized at an intermediate tree density. Below this optimal tree density the benefits from any additional trees on water percolation exceed their extra water use, leading to increased groundwater recharge, while above the optimum the opposite occurs. Our results, based on groundwater budgets calibrated with measurements of drainage and transpiration in a cultivated woodland in West Africa, demonstrate that groundwater recharge was maximised at intermediate tree densities. In contrast to the prevailing view, we therefore find that moderate tree cover can increase groundwater recharge, and that tree planting and various tree management options can improve groundwater resources. We evaluate the necessary conditions for these results to hold and suggest that they are likely to be common in the seasonally dry tropics, offering potential for widespread tree establishment and increased benefits for hundreds of millions of people

Place, publisher, year, edition, pages
2016. Vol. 6, article id 21930
National Category
Economics
Research subject
Economics
Identifiers
URN: urn:nbn:se:ltu:diva-7941DOI: 10.1038/srep21930ISI: 000370742000001PubMedID: 26908158Scopus ID: 2-s2.0-84959449913Local ID: 6613f190-3ea0-4eff-be3f-3978ddbfbff2OAI: oai:DiVA.org:ltu-7941DiVA, id: diva2:980831
Note
Validerad; 2016; Nivå 2; 20160302 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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