Benegas, Laura
- Department of Forest Ecology and Management, Swedish University of Agricultural Sciences
- Tropical Agricultural Research and Higher Education Center
Research article2014Peer reviewed
Benegas, Laura; Ilstedt, Ulrik; Roupsard, O.; Jones, J.; Malmer, Anders
We tested the hypothesis that trees have measurable effects on infiltrability, macroporosity, and preferential flows in agrosilvopastoral systems. Managing agricultural systems for water conservation is a critical component of sustainable systems. We investigated the relationship between infiltrability and the distance to the nearest tree, and whether differences in macroporosity can account for differences in infiltrability.In both systems, preferential soil water flows were dominant compared to matrix flow. Trees in the pasture landscape improved infiltrability and preferential flow but had no significant effect in the coffee agroforestry system. After comparing rainfall intensity and frequency data to the measured infiltrability values, we conclude that trees in the pasture system reduce surface runoff at the highest observed rainfall intensities (>50 mm h(-1)). The volcanic soils of the coffee plantation are less degraded and their high natural permeability has been maintained. Since the coffee plants at this site are established (40 years) perennial vegetation with substantial residues and extensive root systems like trees, they improve soil physical properties similarly to trees.Trees increase hydrologic services in pasture lands, a rapidly expanding land use type across Latin America, and therefore may be a viable land management option for mitigating some of the negative environmental impacts associated with land clearing and animal husbandry. However, in land management practices where understorey perennial vegetation makes up a large proportion of the cover, such as for coffee agroforestry systems, the effect of trees on infiltration-related ecosystem services could be less pronounced (C) 2013 Elsevier B.V. All rights reserved.
Rainfall intensities; Trees outside the forest; Soil-water physical properties; Macroporosity; Tropics
Agriculture, Ecosystems and Environment
2014, Volume: 183, pages: 185-196 Publisher: Elsevier Masson
SDG15 Life on land
Forest Science
DOI: https://doi.org/10.1016/j.agee.2013.10.027
https://res.slu.se/id/publ/51236