Greenhouse gas emissions from a tropical moist evergreen forest soil

Name: Sokkhy Pin

keyword: Tropical moist evergreen forest

Abstract: Greenhouse gas emissions were studied in a moist evergreen forest soil inside Trat Agroforestry Research Station, Muang district, Trat province. The following are typical characteristics at the site: elevation: 20-40 m above average sea level, climate: tropical monsoon with mean annual temperature of 26.8 C; average annual relative humidity and rainfall rate: 81.95% and about 3,000-4,000 rom, respectively. The objectives of this study were to measure the greenhouse gas concentrations along a moist evergreen forest soil profile, to estimate net greenhouse gas fluxes in a tropical moist evergreen forest soil and to investigate the environmental factors affecting greenhouse gas emissions. CO2 and CH4 fluxes were measured real-time during July-December 2006 and January 2007 by using a close-automated chamber connected to a Li-Cor 6200 CO2 analyzer and a CH4 semiconductor sensor, respectively and by using an ordinary chamber. Average humidity, air temperature and rainfall rate in the 2006 were 90.48%, 28.34 C and 1912.01 rom, respectively. Soil moisture along depths were 24.55, 33.08, 34.58, 35.83, 36.1234.38 and 36.01 % at depths 10, 20, 30, 40, 50, 60 and 70 cm, respectively. The mean CO2 flux was 568.68 mg CO2 m-2 h-1. The average CH4 flux was 0.18 mg CH4 m-2 h- 1. CO2 and CH4 fluxes increased to the maximum value during nighttime and these patterns were not correlated with air temperature, soil temperature at 2 and 5 cm depth. An average methane flux during wet season was 0.15 mg CH4 m-2 h- 1 and during dry season was 0.24 mg CH4 m-2 h-1. Average carbon dioxide flux within wet season was 621.65 mg CO2 m-2 h-1. Average carbon dioxide flux within dry season was 483.91 mg CO2 m-2 h-l. Along the soil profile, CO2 concentration was highest at 80 cm depth and CH4 concentration was highest in the subsoil below 50 cm. On the other hand, N2O concentration was highest at 80 cm depth. It seems that soil moisture but not air temperature or soil temperature or humidity that control the production and emissions of CH4. From these results, it can be concluded that tropical moist evergreen forest soil acts as the net source of CH4, CO2 and N2O. However, the magnitudes of fluxes in forest soil were much smaller compared to other sources.

King Mongkut's University of Technology Thonburi. KMUTT Library.

Address: BANGKOK

Email: info.lib@mail.kmutt.ac.th

Name: Arnnat Chidthaisong

Role: Advisor

Created: 2007

Modified: 2557-03-25

Issued: 2553-01-01

วิทยานิพนธ์/Thesis

application/pdf

JGSEE155

tha

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Environmental Technology

Grantor: King Mongkut's University of Technology Thonburi

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