Soil Carbon Dioxide Emission and Soil Carbon Stock in Different Forest Types at Doi Suthep - Pui National Park, Chiang Mai Province
Keywords:
Soil carbon dioxide emission, Soil carbon stock, Doi suthep - pui national parkAbstract
The objectives of this study were to investigate 1) the variation and comparison of carbon dioxide emissions and soil carbon stock and 2) the relationship between environmental factors and soil properties with carbon dioxide emissions and soil carbon stock in different forest types consist of dry dipterocarp forest, mixed deciduous forest and hill evergreen forest during September 2016-August 2017 by data collection every month. In this study squares of 40 m × 40 m was used for CO2 emission measurement and soil sampling collection at the same time. The measure of CO2 emissions was taken by Close Dynamic Chamber Method using EGM-4 soil moisture, soil temperature and air temperature were measurements. Disturbed soil samples were taken at 0-5 cm soil depth in different forest types for analysis of some soil properties. The results found that hill evergreen forest posed highest CO2 emission, moderately in dry dipterocarp forest and lowest in a mixed deciduous forest which was 0.51, 0.46 and 0.43 gCO2/m2/hr., respectively. While, soil carbon stock was highest in hill evergreen forest, moderate in mixed deciduous forest and lowest in dry dipterocarp forest which was 0.21, 0.13 and 0.12 g/m2, respectively. The yearly relationship between environmental factors and soil properties with CO2 emissions and soil carbon stock revealed that soil moisture, soil temperature, air temperature, rainfall amount, Total-N, exch. Mg, exch. Na, exch. Ca, CEC, pH, EC, OC and OM were highly influential on CO2 emissions and soil carbon stock. Furthermore, the seasonal relationship showed a high correlation in both wet and dry seasons, while, slightly higher in the wet season. However, environmental factors such as soil moisture, soil temperature and air temperature were higher influence than soil properties in all of the forest types.
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