Stomatal Response Characteristics of Dry Evergreen and Dry Deciduous Forests in Kampong Thom, Cambodia

Daikoku, Kenichi; Hattori, Satoshi; Deguchi, Aiko; Fujita, Yuji; Araki, Makoto; Nobuhiro, Tatsuhiko

doi:10.1007/978-4-431-46503-4_9

Cited by 3 publications

(4 citation statements)

References 23 publications

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“…3, see Section 3.1). Though, for six trees at the Kampong Thom site, Daikoku et al (2007) observed stomatal closure of individual leaves during the dry season, the elevated atmospheric evaporative demand in the same season (Section 2.1) is likely to exert greater influence on the stand-scale ET. Along with the atmospheric evaporative demand, both the deep soil (>4 m; Ohnuki et al, 2006) and high groundwater level (no deeper than 3 m even in the late dry season; Araki et al, 2007) at their site may play key roles in supporting the dry season ET.…”

Section: Dry Evergreen Forestmentioning

confidence: 93%

A review of evapotranspiration estimates from tropical forests in Thailand and adjacent regions

Tanaka

Kume

Yoshifuji

et al. 2008

Agricultural and Forest Meteorology

107

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Section: Dry Evergreen Forestmentioning

confidence: 93%

A review of evapotranspiration estimates from tropical forests in Thailand and adjacent regions

Tanaka

Kume

Yoshifuji

et al. 2008

Agricultural and Forest Meteorology

107

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“…We also measured the leaf gas exchange rate from 2 to 5 leaves per sampled branch. All measurements were conducted before 12:00 to avoid the midday depression of photosynthesis 10,29 .…”

Section: Measurement Of Leaf Physiological and Morphological Charactementioning

confidence: 99%

“…In the early dry season, leaf photosynthetic activities seemed high, especially in the dry evergreen forest, with high water storage in a thick soil layer 27,61,62 . In fact, the stomatal conductance in several trees showed relatively higher value in the early dry season 10 and soil and regolith were widely distributed throughout the study site 51 to a thickness exceeding 10 m.…”

mentioning

confidence: 90%

Variations in Leaf Photosynthetic and Morphological Traits with Tree Height in Various Tree Species in a Cambodian Tropical Dry Evergreen Forest

Tanaka

Yoneda

Sano

et al. 2012

JARQ

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In this study, we demonstrate changes in leaf morphological and physiological traits with tree height from dark understory to bright canopy conditions in various tree species in the Cambodian tropical dry evergreen forest. The vegetation mainly consisted of Dipterocarpaceae and Myristicaceae and the canopy trees usually reached 30-40 m in height. We investigated 25 individuals of 18 tree species ranging from 0.8 to 33 m in height. We measured the leaf photosynthetic rate, stomatal conductance and respiration rate for 3 to 5 leaves per sampling position in the early dry season. All leaves were then divided into two parts: one for measuring dry weight, nitrogen content and δ 13 C; the other for observation of leaf morphology. The leaf morphological traits, such as leaf mass per area (LMA), cuticle thickness, palisade layer thickness, leaf hardness and stomatal density increased linearly with tree height. The leaf nitrogen content per unit leaf area (N area ) peaked at 10 m from the ground, though the nitrogen content per unit dry leaf mass (N mass ) decreased linearly with tree height. Higher LMA, cuticle thickness and hard leaves in canopy condition may contribute to high drought tolerance and physical strength. The leaf-area-based photosynthetic rate (A max-area ) peaked at an intermediate tree height of approximately 10 m, and then decreased toward the upper canopy. In contrast, the leafmass-based photosynthetic rate (A max-mass ) decreased linearly with tree height. Reduction of leaf nitrogen content and stomatal conductance mainly limit photosynthetic capacities with tree height. Overall, many leaf morphological traits could be summarized in a simple and significant relation with tree height, though increasing tree height, which is related to the micro-climatic gradient, leads to both nitrogen and stomatal constraints of leaf photosynthetic capacities, even when considering many different tree species.

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“…Ohnuki et al (2006) also observed root systems at depths of at least 4 m. These researches suggest that the transpiration of large trees with root system around 4-5 m depth in this forest may result from water consumption in the deep soil layer at about 4 m during the late dry season. Daikoku et al (2007) measured transpiration at the single-leaf level of small trees about 2-5 m high at our study site in May 2005, and reported that a soil moisture deficit limited transpiration from leaves of small trees. Kume et al (2007) reported that sap flow in small trees between 4.8 and 1.4 m high recovered after irrigation in a hill evergreen forest in northern Thailand.…”

Section: Resultsmentioning

confidence: 99%

Comparison of soil moisture effects on surface conductance between late dry and rainy seasons in an evergreen forest of central Cambodia

Tamai

Shimizu

Nobuhiro

et al. 2008

Paddy Water Environ

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Some forests in the Asian monsoon region are reported to transpire actively, even in the late dry season. The evergreen forest in central Cambodia is included in them. The surface conductance was estimated for an evergreen forest in central Cambodia in the late dry (May) and rainy (August) seasons, and the effects of environmental conditions on surface conductance were compared between seasons. The effects of soil moisture did not differ between seasons, indicating that soil water drought in the late dry season does not limit transpiration from the entire forest community. Evergreen forests in central Cambodia are thought to transpire actively in the late dry season.

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Stomatal Response Characteristics of Dry Evergreen and Dry Deciduous Forests in Kampong Thom, Cambodia

Cited by 3 publications

References 23 publications

A review of evapotranspiration estimates from tropical forests in Thailand and adjacent regions

A review of evapotranspiration estimates from tropical forests in Thailand and adjacent regions

Variations in Leaf Photosynthetic and Morphological Traits with Tree Height in Various Tree Species in a Cambodian Tropical Dry Evergreen Forest

Comparison of soil moisture effects on surface conductance between late dry and rainy seasons in an evergreen forest of central Cambodia

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