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Reduced dry season transpiration is coupled with shallow soil water use in tropical montane forest trees.
Muñoz-Villers, Lyssette E; Holwerda, Friso; Alvarado-Barrientos, M Susana; Geissert, Daniel R; Dawson, Todd E.
Afiliação
  • Muñoz-Villers LE; Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, 04510, Mexico City, Mexico. lyssette.munoz@atmosfera.unam.mx.
  • Holwerda F; Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, 04510, Mexico City, Mexico.
  • Alvarado-Barrientos MS; CONACyT-El Colegio de la Frontera Sur (ECOSUR), Chetumal, Quintana Roo, Mexico.
  • Geissert DR; Red de Ecología Funcional, Instituto de Ecología, A.C., Xalapa, Veracruz, Mexico.
  • Dawson TE; Red de Ecología Funcional, Instituto de Ecología, A.C., Xalapa, Veracruz, Mexico.
Oecologia ; 188(1): 303-317, 2018 Sep.
Article em En | MEDLINE | ID: mdl-29943144
Tropical montane cloud forests (TMCF) are ecosystems particularly sensitive to climate change; however, the effects of warmer and drier conditions on TMCF ecohydrology remain poorly understood. To investigate functional responses of TMCF trees to reduced water availability, we conducted a study during the 2014 dry season in the lower altitudinal limit of TMCF in central Veracruz, Mexico. Temporal variations of transpiration, depth of water uptake and tree water sources were examined for three dominant, brevi-deciduous species using micrometeorological, sap flow and soil moisture measurements, in combination with oxygen and hydrogen stable isotope composition of rainfall, tree xylem, soil and stream water. Over the course of the dry season, reductions in crown conductance and transpiration were observed in canopy species (43 and 34%, respectively) and mid-story trees (23 and 8%), as atmospheric demand increased and soil moisture decreased. Canopy species consistently showed more depleted isotope values compared to mid-story trees. However, MixSIAR Bayesian model results showed that the evaporated (enriched) soil water pool was the main source for trees despite reduced soil moisture. Additionally, while increases in tree water uptake from deeper to shallower soil water sources occurred, concomitant decreases in transpiration were observed as the dry season progressed. A larger reduction in deep soil water use was observed for canopy species (from 79 ± 19 to 24 ± 20%) compared to mid-story trees (from 12 ± 17 to 10 ± 12%). The increase in shallower soil water sources may reflect a trade-off between water and nutrient requirements in this forest.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Solo / Água Tipo de estudo: Prognostic_studies País/Região como assunto: Mexico Idioma: En Revista: Oecologia Ano de publicação: 2018 Tipo de documento: Article País de afiliação: México País de publicação: Alemanha
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Solo / Água Tipo de estudo: Prognostic_studies País/Região como assunto: Mexico Idioma: En Revista: Oecologia Ano de publicação: 2018 Tipo de documento: Article País de afiliação: México País de publicação: Alemanha