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Drought Differentially Affects Growth, Transpiration, and Water Use Efficiency of Mixed and Monospecific Planted Forests

AuthorsSinacore, Katherine; Asbjornsen, H.; Hernández Santana, V. ; Hall, Jefferson S.
KeywordsAgua Salud
El Niño
Planted forests
Issue Date11-Feb-2019
PublisherMultidisciplinary Digital Publishing Institute
CitationForests 10(2): 153 (2019)
AbstractDrought conditions may have differential impacts on growth, transpiration, and water use efficiency (WUE) in mixed species and monospecific planted forests. Understanding the resistance (i.e., the capacity to maintain processes unchanged) of different tree species to drought, and how resistance is affected by complementary interactions within species mixtures, is particularly important in the seasonally dry tropics where projected increases in the frequency and severity of drought threaten tree planting efforts and water resources. Complementary interactions between species may lead to more resistant stands if complementarity leads to greater buffering capacity during drought. We examined growth, transpiration, and WUE of mixtures and monocultures of Terminalia amazonia (J.F. Gmel.) Exell and Dalbergia retusa Hemsl. before and during a prolonged drought using intensive measurements of tree sap flow and growth. Tree sapwood area growth was highest for T. amazonia in mixtures during normal (6.78 ± 4.08 mm 2 yr -1 ) and drought (7.12 ± 4.85 mm 2 yr -1 ) conditions compared to the other treatments. However, stand sapwood area growth was greatest for T. amazonia monocultures, followed by mixtures, and finally, D. retusa monocultures. There was a significant decrease in stand transpiration during drought for both mixtures and T. amazonia monocultures, while Dalbergia retusa monocultures were most water use efficient at both the tree and stand level. Treatments showed different levels of resistance to drought, with D. retusa monocultures being the most resistant, with non-significant changes of growth and transpiration before and during drought. Combining species with complementary traits and avoiding combinations where one species dominates the other, may maximize complementary interactions and reduce competitive interactions, leading to greater resistance to drought conditions
Description19 páginas.-- 7 figuras.-- 2 Tablas.--61 referencias.-- The following are available online at http://www.mdpi.com/1999-4907/10/2/153/s1
Publisher version (URL)http://dx.doi.org/10.3390/f10020153
Appears in Collections:(IRNAS) Artículos
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