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Authors
Affiliations
1 Forest Ecology and Climate Change Division, Forest Research Institute, Dehradun 248 006, IN
Source
Current Science, Vol 119, No 4 (2020), Pagination: 661-669
Abstract
In this study, the soil CO2 efflux was measured by closed dynamic system method along with soil and meteorological parameters at 1600, 1700 and 1800 m elevations along different directional-aspects over a period of one year. The annual CO2 efflux rate (Fc) varied from 1.02 to 22.57 μmol m–2 sec–1, which was highest in the rainy season. The annual average Fc was maximum (8.67 μmol m–2 sec–1) at east facing slope followed by 7.58 and 7.32 μmol m–2 sec–1 at south facing slope and north facing slope respectively. Temperature (Ts), moisture (Sm) and evaporation of soil were found to be significant variables and selected to develop the regression model with R2 value of 0.85. The effect of soil moisture on Fc above 15°C Ts exhibited a better relationship with R2 value of 0.48 and temperature sensitivity (Q10) was found 3.25. This study reveals that the key controlling factors of CO2 efflux rate are soil moisture and soil temperature, which explains 66% variation in soil CO2 efflux.
Keywords
Seasonal Variation, Soil CO2 Efflux, Soil Moisture, Soil Temperature, Spatial Variation, West Himalayas.
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