Dry forest ecosystems of Thailand

Rundel, Philip W.; Boonpragob, Kansri

doi:10.1017/cbo9780511753398.005

Cited by 70 publications

(80 citation statements)

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“…Rainfall sometimes fluctuates because of the El Niñ o Southern Oscillation (Nounmusig et al 2006): the annual rainfall at the station was 1927 mm in 1997, 1243 mm in 1998, and 1733 mm in 1999 respectively. 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).…”

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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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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“…In some years the first significant rains may arrive as early as mid-March, while in other years the rains may arrive as late as mid-May. The early dry season is comparatively cool (mean minimum and maximum January temperatures are 18.3 and 32.5°C, respectively), with maximum daily temperatures reaching a peak during the late dry season (mean minimum and maximum April temperatures are 25.6 and 37.9°C, respectively) (Rundel and Boonpragob 1995).…”

Section: Study Sitementioning

confidence: 99%

Deciduousness in a seasonal tropical forest in western Thailand: interannual and intraspecific variation in timing, duration and environmental cues

Bunyavejchewin²,

2008

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Seasonal tropical forests exhibit a great diversity of leaf exchange patterns. Within these forests variation in the timing and intensity of leaf exchange may occur within and among individual trees and species, as well as from year to year. Understanding what generates this diversity of phenological behaviour requires a mechanistic model that incorporates rate-limiting physiological conditions, environmental cues, and their interactions. In this study we examined long-term patterns of leaf flushing for a large proportion of the hundreds of tree species that cooccur in a seasonal tropical forest community in western Thailand. We used the data to examine community-wide variation in deciduousness and tested competing hypotheses regarding the timing and triggers of leaf flushing in seasonal tropical forests. We developed metrics to quantify the nature of deciduousness (its magnitude, timing and duration) and its variability among survey years and across a range of taxonomic levels. Tree species varied widely in the magnitude, duration, and variability of leaf loss within species and across years. The magnitude of deciduousness ranged from complete crown loss to no crown loss. Among species that lost most of their crown, the duration of deciduousness ranged from 2 to 21 weeks. The duration of deciduousness in the majority of species was considerably shorter than in neotropical forests with similar rainfall periodicity. While Communicated by

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“…The stands had not been weeded, thinned or otherwise tended. The natural forest was a dry evergreen forest representing the main forest type in mesic areas of the Khorat Plateau 25 . The 2 dominant grassland species studied were Imperata cylindrica and Saccharum spontaneum.…”

Section: Research Sites and Standsmentioning

confidence: 99%

Plant Species Diversity in Tropical Planted Forests and Implication for Restoration of Forest Ecosystems in Sakaerat, Northeastern Thailand

Kamo

Vacharangkura

Tiyanon

et al. 2002

JARQ

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Plantations of single tree species which are usually set up to reafforest cleared lands in the tropics, have often been criticized for being associated with a low level of diversity in the ecosystems. However, our study of understorey plant species in various plantations of single exotic or indigenous species has shown that more plant species grew within stands near a natural forest than within grasslands in Sakaerat, northeastern Thailand. These forests contribute to the acceleration of the secondary succession from grassland, which before reafforestation was achieved by recurrent fires. In the natural regeneration of understorey tree species in planted forests, large tree species in the natural forest seem to be the major common seed source among the stands studied. The small leaf biomass in these planted forests generated enough shade to prevent the invasion of 2 fire-adapted competitive grasses and to provide a suitable light environment for seedling establishment at an early stage of forest development. These factors facilitated the establishment of other species within the plantations of single tree species. Faster-growing exotic species accumulated larger amounts of understorey biomass than indigenous species. The most suitable species was Acacia mangium. The association of forests planted with single tree species with a high species richness in the ecosystems may enable to achieve a high biological diversity at the landscape level, which could bring various benefits to the forests of Sakaerat.Discipline: Forestry and forest products Additional key words: catalytic effect, forest restoration, plantation, plant species richness This study was conducted as a part of the after

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Dry forest ecosystems of Thailand

Cited by 70 publications

References 0 publications

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

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

Deciduousness in a seasonal tropical forest in western Thailand: interannual and intraspecific variation in timing, duration and environmental cues

Plant Species Diversity in Tropical Planted Forests and Implication for Restoration of Forest Ecosystems in Sakaerat, Northeastern Thailand

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