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Positive Effects of Scattered Trees on Soil Water Dynamics in a Pasture Landscape in the Tropics

Benegas, Laura and Hasselquist, Niles and Bargues Tobella, Aida and Malmer, Anders and Ilstedt, Ulrik (2021). Positive Effects of Scattered Trees on Soil Water Dynamics in a Pasture Landscape in the Tropics. Frontiers in Water. 3 , 736824
[Research article]

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Abstract

As a result of canopy interception and transpiration, trees are often assumed to have negative effects on the local hydrological budget resulting in reduced soil and groundwater resources. However, it has also been shown that trees can have positive effects through reducing surface run-off and improving soil infiltrability and groundwater recharge, especially in many tropical ecosystems characterized by high rain intensity and degradation-prone soils. In this study, we used isotopic measurements of soil water to better understand the main processes by which trees influence local soil water dynamics within a tropical pasture with scattered tree cover in the Copan River catchment, Honduras. We also determined the stable isotope signature of xylem water in grasses and trees to assess potential competition for water sources during the wet and dry seasons. During the wet season, when soil water availability was not limiting, both grasses and trees primarily utilized soil water near the soil surface (i.e., 0–10 cm). In contrast, during the dry season, we observed niche partitioning for water resources where grasses primarily utilized soil moisture at deeper soil depth (i.e., 90–100 cm) while trees relied heavily on groundwater. Moreover, isotopic data of soil water suggest that trees reduce evaporative water losses from the soil surface, as indicated by the lack of correlation between soil water content and lc-excess (line condition excess) values of surface soil water under trees, and enhance preferential flow as suggested by less negative lc-excess values under trees compared to open areas during the dry season. Taken together, our findings provide further support that trees can have positive effects on the local water balance with implication for landscape management, promoting the inclusion of scattered trees to provide water ecosystem services in silvopastoral systems, adding to other ecosystem services like biodiversity or carbon sequestration.

Authors/Creators:Benegas, Laura and Hasselquist, Niles and Bargues Tobella, Aida and Malmer, Anders and Ilstedt, Ulrik
Title:Positive Effects of Scattered Trees on Soil Water Dynamics in a Pasture Landscape in the Tropics
Series Name/Journal:Frontiers in Water
Year of publishing :2021
Volume:3
Article number:736824
Number of Pages:13
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:niche partitioning, groundwater recharge, land management, ecosystem, tree-grass coexistence, isosource mixing model
URN:NBN:urn:nbn:se:slu:epsilon-p-114145
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114145
Additional ID:
Type of IDID
DOI10.3389/frwa.2021.736824
ID Code:25988
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:29 Oct 2021 10:25
Metadata Last Modified:29 Oct 2021 10:31

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