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Volume 47S Number 1

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Research articles

ScienceAsia 47S (2021): 112-119 |doi: 10.2306/scienceasia1513-1874.2021.S009

Seasonal changes in spatial variation of soil respiration in dry evergreen forest, Sakaerat Biosphere Reserve, Thailand

Warin Boonriama, Pongthep Suwanwareea,*, Sasitorn Hasinb, Taksin Archawakomc, Phuvasa Chanonmuangd, Akinori Yamadae,f

ABSTRACT:     Soil respiration in tropical forests is an important source of carbon dioxide in the atmosphere. Factors regulating spatial soil respiration are still unclear, and they may lead to an inaccurate estimation of soil respiration at the ecosystem level. The aim of this study was to investigate the seasonal changes in spatial variation of soil respiration in a dry evergreen forest of Sakaerat Biosphere Reserve, Nakhon Ratchasima Province, Thailand. Soil respiration, temperature, and moisture were measured in 100 subplots of five 1-ha main plots for four times from November 2014 to August 2016. The average rate ( ± SD) of annual aboveground soil respiration was 6.57 ± 4.29 µmol CO2 m-2s-1. Soil respiration considerably varied with space and time. The mean ranges were from 2.66 to 11.72 µmol CO2 m-2s-1 with a maximum rate of 42.68 µmol COsub>2 m-2s-1. The wet season soil respiration rate (8.81 µmol CO2 m-2s-1) was two times higher (p < 0.001) than in the dry season (4.33 µmol CO2 m-2s-1). The seasonal changes clearly affected the spatial variation of soil respiration. Wet season produced higher and more widespread soil respiration. Although soil respiration rates increase with increasing soil temperature and soil moisture content, the rate starts to drop at 27 °C soil temperature (p < 0.001) and 21% soil moisture content (p < 0.05). This study suggests more investigation of soil features and animal influences on CO2 emission hot spots in order to accurately estimate soil respiration in tropical forests.

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a School of Biology, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000 Thailand
b Innovation of Environmental Management, College of Innovative Management, Valaya Alongkorn Rajabhat University under the Royal Patronage, Pathum Thani 13180 Thailand
c Sakaerat Environmental Research Station, Nakhon Ratchasima 30370 Thailand
d Expert Centre of Innovation Clean Energy and Environment, Thailand Institute of Scientific and Technological Research, Pathum Thani 12120 Thailand
e Department of Biological Sciences, Tokyo Institute of Technology, Tokyo 226-8501 Japan
f Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki 852-8521 Japan

* Corresponding author, E-mail: pongthep@sut.ac.th

Received 10 Nov 2020, Accepted 28 Apr 2021