Contrasting seasonal leaf habits of canopy trees between tropical dry-deciduous and evergreen forests in Thailand

Ishida, Akira; Diloksumpun, Sapit; Ladpala, Phanumard; Staporn, Duriya; Panuthai, Samreong; Gamo, Minoru; Yazaki, K.; Ishizuka, Moriyoshi; Puangchit, Ladawan

doi:10.1093/treephys/26.5.643

Cited by 87 publications

(78 citation statements)

References 61 publications

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“…Espécies decíduas exibem alta capacidade fotossintética e duração curta das folhas. Por outro lado, espécies sempre verdes constroem folhas com alto investimento de carbono que possibilita maior LF, porém, reduz sua capacidade fotossintética (Eamus 1999;Ishida et al 2006).…”

Section: Discussionunclassified

“…Além disso, diferenças pronunciadas na g s entre espécies decíduas e sempre verdes são comumente descritas em diversos ecossistemas sazonalmente secos (Chen et al 2009;Mediavilla & Escudero, 2003;Ishida et al 2006) e são interpretadas com uma demanda conflitante entre LF e eficiência hidráulica (Sobrado 1993;Ishida et al 2010;Fu et al 2012). Embora não observamos diferenças significativas na g s entre espécies decíduas e sempre verdes, acreditamos que a b a maior taxa fotossintética por unidade de massa nas espécies decíduas, ocorreu possivelmente por que essas espécies exibiram menor massa foliar por unidade de área, o que representa uma barreira física a difusão do CO 2 .…”

Section: Discussionunclassified

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Divergências funcionais e estratégias de resistência à seca entre espécies decíduas e sempre verdes tropicais

et al. 2015

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ResumoAnalisamos a variação funcional entre espécies decíduas (ED) e sempre verdes (ESV) para compreender as divergências nas estratégias de tolerância e evitação à seca. O estudo foi realizado em um fragmento de floresta tropical sazonalmente seca, localizada no munícipio de Pentecoste (3°47'S, 39°16'W), Ceará, Brasil. Mensuramos 17 traços funcionais foliares em 17 ED e cinco ESV, sendo 12 morfofuncionais, um fenológico e quatro fisiológicos. Verificamos que as ED exibiram maior taxa de fotossíntese por massa (A massa ), menor longevidade foliar (LF) e massa foliar específica (MFE) quando comparadas às sempre verdes. Esses traços foram considerados traços-chaves preditores das estratégias de evitação e tolerância à seca. As ED e ESV apresentaram uma demanda conflitante entre tolerância à seca e taxa fotossintética, pois a LF foi negativamente correlacionada com à A massa . Embora tenham demonstrado diferenças claras na MFE e LF não observamos diferenças significativas na A área e g s , consequentemente, ED e ESV não diferiram na eficiência no uso da água durante o período chuvoso. Apesar da variabilidade substancial dentro do grupo, todas as ED exibem estratégia de evitação à seca enquanto que ESV exibem um conjunto de traços funcionais foliares relacionados a estratégia de tolerância à seca. Palavras-chave: Grupos fenológicos, tolerância à seca, evitação à seca. AbstractWe analyzed the functional variation between deciduous and evergreen species to understand the differences across the strategies of avoidance and tolerance to drought. Our study was carried in a fragment of seasonally dry tropical forest located in the city of Pentecoste (3°47'S, 39°16'W), Ceará, Brazil. We measured 17 functional leaf traits in 17 deciduous and five evergreen species, being 12 morphofunctional, one phenological and four physiological. We found that deciduous species exhibited greater A mass , lower leaf lifespan (LL) and leaf mass per area (LMA) than evergreen species. These traits were considered key predictor traits of avoidance and drought tolerance strategies. Deciduous and evergreen species showed a trade-off between drought tolerance and photosynthetic rate, LL was negatively correlated with A mass . Although we have shown clear differences in LMA and LL not observed significant differences in A area and g s , consequently, deciduous species and evergreen species did not find significant differences in WUE i and WUE. Despite substantial variability within the group, all deciduous species fall predominantly in the drought avoidance strategy, while evergreen species display a suite of traits related to drought tolerance.

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Section: Discussionunclassified

Divergências funcionais e estratégias de resistência à seca entre espécies decíduas e sempre verdes tropicais

et al. 2015

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“…High temperature and VPD have negative effects on plant carbon balance and plant water status (Jones 1992, Larcher 2003. Even if water is freely available, short periods with relatively mild levels of VPD (>2 kPa), as found even under closed canopies, markedly reduce photosynthetic gains of tropical drought-avoiding species (Ishida et al 2006, Shirke & Pathre 2004. Many TDF species are filtered out from early successional communities, and recruit more numerously in the shadier and moister late-successional communities (Aerts et al 2007, Lebrija-Trejos et al 2010a, Lieberman & Li 1992.…”

Section: Potential Implications For Species Performancementioning

confidence: 99%

Environmental changes during secondary succession in a tropical dry forest in Mexico

et al. 2011

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Vegetation and environment change mutually during secondary succession, yet the idiosyncrasies of the vegetation effect on the understorey environment are poorly understood. To test whether the successional understorey environment changes predictably and is shaped by the structure and seasonality of tropical dry forests, we estimated basal area and vegetation cover, and measured understorey temperature, light and moisture conditions, in 17 plots forming a 60-y chronosequence and a mature forest. Light and air and soil temperature decreased with time (75−15% of open-sky radiation, 31.7−29.3 • C, and +2.5 • C to −0.5 • C relative to ambient, respectively), whereas relative humidity increased (67−74%). Soil water availability increased with early-successional development (−45 to −1 kPa) but decreased afterwards (to −18 kPa). The first axis of a PCA of the rainy-season environment explained 60% of the variation and was strongly related to air temperature and relative humidity. During tropical dry-forest succession, such factors may be more important than light, the reduction in which is not extreme compared with taller and more vertically stratified wet forests. Seasonality significantly affected the successional environmental gradients, which were marked mainly during the wet season. Environmental heterogeneity was higher in the wet than in the dry season, and larger for resources (light and water) than for conditions (temperature and humidity). The wet-season increase in environmental heterogeneity potentially creates differential growing scenarios; the environmental harshness of the dry season would mostly challenge seedling survival.

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“…The forest in the watershed was mainly covered by mixed deciduous forest (MDF) (Rundel and Boonpragob 1995). Detailed descriptions of the vegetation and eco-physiological characteristics were given by Marod et al (1999Marod et al ( , 2002 and Ishida et al (2006). The dominant tree species in the study area were Shorea siamensis, Vitex peduncularis, Dillenia parviflora var.…”

Section: Study Sitesmentioning

confidence: 99%

Topographic variation in heterotrophic and autotrophic soil respiration in a tropical seasonal forest in Thailand

Takahashi

Hirai

Limtong³

et al. 2011

Soil Science and Plant Nutrition

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Soil respiration is a carbon flux that is indispensable for determining carbon balance despite variations over time and space in forest ecosystems. In Kanchanaburi, western Thailand, we measured the soil respiration rates at different slope positions-ridge (plot R), upper slope (plot U), and lower slope (plot L)-on a hill in a seasonal tropical forest [mixed deciduous forest (MDF)] to determine the seasonal and spatial variations in soil respiration on the slope. The heterotrophic (organic layer and soil) and autotrophic (root) respiration was differentiated by trenching. Soil respiration rates showed clear seasonal patterns: high and low rates in rainy and dry seasons respectively, at all plots, and tended to decrease up the slope. Soil respiration rates responded significantly to soil water content in the 0-30 cm layer, but the response patterns differed between the lower slope (plot L) and the upper slope (plots R and U): a linear model could be applied to the lower slope but exponential quadratic models to the upper slope. The annual carbon dioxide (CO 2 ) efflux from the forest floor was also associated with the slope position and ranged from 1908 gC m À2 year À1 in plot L to 1199 gC m À2 year À1 in plot R. With ascending position from plot L to R, the contribution of autotrophic respiration increased from 19.4 to 36.6% of total soil respiration, while that of the organic layer decreased from 26.2 to 9.4%. Mineral soil contributed to 46.3 to 54.4% of the total soil respiration. Soil water content was the key factor in controlling the soil respiration rate and the contribution of the respiration sources. However, the variable responses of soil respiration to soil water content create a complex distribution of soil respiration at the watershed scale.

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Contrasting seasonal leaf habits of canopy trees between tropical dry-deciduous and evergreen forests in Thailand

Cited by 87 publications

References 61 publications

Divergências funcionais e estratégias de resistência à seca entre espécies decíduas e sempre verdes tropicais

Divergências funcionais e estratégias de resistência à seca entre espécies decíduas e sempre verdes tropicais

Environmental changes during secondary succession in a tropical dry forest in Mexico

Topographic variation in heterotrophic and autotrophic soil respiration in a tropical seasonal forest in Thailand

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