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No. de sistema: 000059125

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008 _ _ 181114m20189999xx^^r^p^^^^^^z0^^^a0eng^d
040 _ _ a| ECO
c| ECO
043 _ _ a| n-mx-ve
044 _ _ a| xx
245 0 0 a| Reduced dry season transpiration is coupled with shallow soil water use in tropical montane forest trees
506 _ _ a| Disponible para usuarios de ECOSUR con su clave de acceso
520 1 _ a| 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.
533 _ _ a| Reproducción electrónica en formato PDF
538 _ _ a| Adobe Acrobat profesional 6.0 o superior
650 _ 4 a| Abastecimiento de agua
650 _ 4 a| Sequía
650 _ 4 a| Humedad de suelos
650 _ 4 a| Propiedades fisicoquímicas del suelo
650 _ 4 a| Características fisicoquímicas del agua
650 _ 4 a| Bosques tropicales
651 _ 4 a| Parque Nacional Cofre de Perote (Veracruz de Ignacio de la Llave, México)
700 1 _ a| Muñoz Villers, Lyssette Elena
700 1 _ a| Holwerda, Friso
e| coaut.
700 1 _ a| Alvarado Barrientos, María Susana
c| Dra.
e| coaut.
n| 47461006200
700 1 _ a| Geissert, Daniel R.
e| coaut.
700 1 _ a| Dawson, Todd E.
e| coaut.
773 0 _
t| Oecologia
g| Vol. 188, no. 1 (September 2018), p. 303-317
x| 1432-1939
900 _ _ a| Solicítelo con su bibliotecario/a
901 _ _ a| Artículo con arbitraje
902 _ _ a| BG / MM
904 _ _ a| Noviembre 2018
905 _ _ a| Artecosur
905 _ _ a| Agua
905 _ _ a| Servibosques
905 _ _ a| Biblioelectrónica
906 _ _ a| Producción Académica ECOSUR
LNG eng
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*Solicítelo con su bibliotecario/a
Reduced dry season transpiration is coupled with shallow soil water use in tropical montane forest trees
Muñoz Villers, Lyssette Elena (autor)
Holwerda, Friso (autor)
Alvarado Barrientos, María Susana (autor)
Geissert, Daniel R. (autor)
Dawson, Todd E. (autor)
Nota: Disponible para usuarios de ECOSUR con su clave de acceso
Contenido en: Oecologia. Vol. 188, no. 1 (September 2018), p. 303-317. ISSN: 1432-1939
No. de sistema: 59125
Tipo: - Artículo con arbitraje
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Inglés

"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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