Ecophysiology of Tropical Dry Evergreen Forest, Thailand: Measured and Modelled Stomatal Conductance of Hopea ferrea, a Dominant Canopy Emergent

Pitman, J. I.

doi:10.2307/2404777

Cited by 26 publications

(26 citation statements)

References 34 publications

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“…Although there are no stomatal conductance data reported for plant communities growing on a lava substratum, the data collected in the Pedregal for B. cordata, D. viscosa and S. praecox showed that measured values of g sMAX were similar to those observed in Buddleia asiatica and Dubautia scabra in a cinder substratum at Hawaii Volcanoes National Park (Matson 1990) and slightly higher in both seasons than those reported by Fanjul and Barradas (1985) in Coccoloba liebmannii and Jacquinia pungens, two tropical deciduous species. Values of g sMAX during the wet season in the three species were slightly lower than those observed in humid tropical forests (Körner 1995;Pitman 1996), but much higher than those presented for Simmondsia chinenses and Encelia asperifolia in the desert of central Baja California (Nilsen et al 1990). However, values of g sMAX for the three species studied in the dry season were very similar to those of species native to the desert of Central Baja California.…”

Section: Discussioncontrasting

confidence: 59%

“…Previous studies of the effect of microenvironmental and physiological variables on stomatal conductance have shown that there is a considerable diversity of responses of g s to different microclimatic and physiological factors (Q, T a , VPD and Y) (Fanjul and Barradas 1985;Roberts et al 1990;Pitman 1996;Meinzer et al 1997a;Comstock and Mencuccini 1998). Although there are no stomatal conductance data reported for plant communities growing on a lava substratum, the data collected in the Pedregal for B. cordata, D. viscosa and S. praecox showed that measured values of g sMAX were similar to those observed in Buddleia asiatica and Dubautia scabra in a cinder substratum at Hawaii Volcanoes National Park (Matson 1990) and slightly higher in both seasons than those reported by Fanjul and Barradas (1985) in Coccoloba liebmannii and Jacquinia pungens, two tropical deciduous species.…”

Section: Discussionmentioning

confidence: 99%

“…Jarvis 1976; Whitehead et al 1981;Fanjul and Barradas 1985;Jones 1992) and it is not clear whether or not the parameters of those models (e.g. Dolman et al 1991;Pitman 1996) are specific to each plant type (or a single canopy) at the time of the measurements or are more generally applicable.…”

Section: Introductionmentioning

confidence: 99%

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Stomatal conductance in a tropical xerophilous shrubland at a lava substratum

Barradas

Ramos-Vázquez

Orozco‐Segovia

2004

International Journal of Biometeorology

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Diurnal variation in leaf stomatal conductance (gs) of three xerophilous species (Buddleia cordata, Senecio praecox and Dodonaea viscosa) was measured over a 10-month period during the dry and wet seasons in a shrubland that is developing in a lava substratum in Mexico. Averaged stomatal conductances were 147 and 60.2 (B. cordata), 145 and 24.8 (D. viscosa) and 142.8 and 14.1 mmol m(-2) s(-1) (S. praecox) during the wet and dry season respectively. Leaf water potential (Psi) varied in a range of -0.6 to -1.2 (S. praecox), -0.6 to -1.8 (B. cordata) and -0.9 to -3.4 MPa (D. viscosa) during the same measurement periods. Stomata were more sensitive to changes in irradiance, air temperature and leaf-air vapour pressure difference in the rainy season than the dry season. Although stomatal responses to Psi were difficult to distinguish in any season (dry or rainy), data for the entire period of measurement showed a positive correlation, stomata tending to open as Psi increased, but there is strong evidence of isohydric behaviour in S. praecox and B. cordata. A multiplicative model relating gs to environmental variables and to Psi accounted for 79%-83% of the variation of gs in three sites (pooled data); however, the performance of the model was poorer (60%-76%) for individual species from other sites not included in the pooled data.

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Section: Discussioncontrasting

confidence: 59%

Section: Discussionmentioning

confidence: 99%

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Stomatal conductance in a tropical xerophilous shrubland at a lava substratum

Barradas

Ramos-Vázquez

Orozco‐Segovia

2004

International Journal of Biometeorology

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“…A number of studies conducted on tropical rain forest suggested that there were both negative and positive responses of forest ET to summer drought. The declined ET was likely caused by reduced stomatal conductance (Pitman, 1996;Ishida et al, 2006) and limited water availability (Malhi et al, 2002), whereas the increased ET was likely caused by the deep rooting systems (Giambelluca et al, 2003) and increased atmospheric ET demand (Greco and Baldocchi, 1996). For example, Nobuhiro et al (2009) conducted ET measurements at a dry evergreen forest site The seasonal course of the ET rates clearly followed the seasonal course of VPD.…”

Section: Discussionmentioning

confidence: 99%

Controls of evapotranspiration during the short dry season in a temperate mixed forest in Northeast China

Jing

Guan

et al. 2012

Ecohydrology

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The long‐term tower‐based eddy covariance measurements of CO2/H2O fluxes are carried out in a temperate mature forest in Northeast China. The current study investigates the atmospheric (net radiation and vapour pressure deficit) and vegetation (surface conductance) controls of the evapotranspiration (ET) within the two observational years with different water conditions. The results show that the ET during the short dry season of 2004 was higher than that during the wet season of 2005. The ET is mainly driven by the meteorological factor of vapour pressure deficit. The mixed forest did not show clear signs of ET suppression during the summer drought because of its slightly reduced surface conductance, whereas its water demands from the atmosphere significantly increased. Thus, the annual ET slightly varied (416·2 to 462·1 mm) despite the large interannual variation in precipitation (488·7 to 761·6 mm). The 0–100 cm deep soil water storages are important sources of water supply for ET during dry seasons. The findings of this study suggest that the possible reduction in precipitation under future climate change scenarios with invariable or even enhanced ET will decrease the replenishment of groundwater and outflow and, consequently, the downstream water supply. Copyright © 2012 John Wiley & Sons, Ltd.

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“…In other words, deciduous and evergreen species are facing with different light conditions along seasonal course. Emergent trees, with crowns protruding above the continuous canopy layer (Pitman et al 1996, Thin 1997, Marod et al 1999, Bunyavejchewin et al 2003, have been widely distributed in tropical monsoon forests. It is well known that different crown shapes exist between emergent tree species and canopy layer species (King 1996, Poorter et al 2006, Iida et al 2011, due primarily to their vertical positions leading to different microclimatic and competitive conditions.…”

Section: Introductionmentioning

confidence: 99%

Interspecific differences in the hierarchical cluster structure of leaves within tree crowns in Indochina

Mochizuki

Marod

Trieu

et al. 2018

Tropics

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Differences in light capture strategies of tropical monsoon trees were examined with a focus on the function of hierarchical leaf cluster structure. Specifically, morphological differences in leaf clusters were examined among ecological functional groups of tree species. The three-dimensional distribution of leaves within 62 crowns of 21 species in or above the canopy layer was estimated using a terrestrial laser scanner. Leaf clusters with hierarchical structure were identified within each crown, and the thickness and inclination of a leaf cluster were calculated. The light capture property of the crown was examined using the light extinction coefficient and the directional dependency of light capture. An ordination technique was used to organize crown architecture into two axes: one corresponding to the directional dependency of light capture, which separates leaf phenological types, and the other representing the spatial scale contributing to light capture, which separates growth forms. Similar leaf cluster shapes at various spatial levels ranging from small leaf clusters to crowns caused specialization of crown directional dependency, which was clearest in emergent species. In deciduous species, flatter leaf clusters at various spatial levels were specialized to efficiently capture overhead light, whereas rounder leaf clusters at various spatial levels in evergreen species were specialized to uniform light capture from all directions. Different light capture strategies among functional groups in tropical monsoon forest would be related to drought stress response.

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Ecophysiology of Tropical Dry Evergreen Forest, Thailand: Measured and Modelled Stomatal Conductance of Hopea ferrea, a Dominant Canopy Emergent

Cited by 26 publications

References 34 publications

Stomatal conductance in a tropical xerophilous shrubland at a lava substratum

Stomatal conductance in a tropical xerophilous shrubland at a lava substratum

Controls of evapotranspiration during the short dry season in a temperate mixed forest in Northeast China

Interspecific differences in the hierarchical cluster structure of leaves within tree crowns in Indochina

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