Soil CO2 Efflux Dynamics and Its Relationship with the Environmental Variables in a Sub-Tropical Mixed Forest
Open Access
- 1 January 2022
- journal article
- research article
- Published by Scientific Research Publishing, Inc. in Open Journal of Forestry
- Vol. 12 (03), 312-336
- https://doi.org/10.4236/ojf.2022.123017
Abstract
Soil CO2 efflux is an ongoing process of respiration from soil; plant parts/ microbes below the ground to the atmosphere which is known for faster cycling of carbon sources. A large portion of carbon sequestered and fixed by forests is returned to the atmosphere through soil CO2 efflux and multiple controlling parameters mainly temperature, precipitation, and growth factors interact with the soil CO2 efflux variation. This study assessed the soil CO2 efflux every month for consecutive 2-years (August 2015 to July 2017) by using the closed chamber method to determine the role of ecological parameters that govern the soil CO2 efflux and its temporal modification in a sub-tropical mixed forest of central region in Nepal. The results of this study manifested that soil CO2 efflux accounted 63.2% (y = 31.96e0.128x), 71.3% (y = 44.77e0.123x) and 64.5% (y = 44.11e0.117x) variations in soil temperature with significantly (p 10) of the soil CO2 efflux was 3.6, 3.4, and 3.2, respectively. Soil water content also expressed significantly (p 2 efflux and accounted 62.0% (y = 138.3e0.057x), 46.1% (y = 88.42e0.052x) and 40.5% (y = 133.1e0.0447x) in its variability in different years and the merged years. Evident variations of soil CO2 efflux, soil temperature, soil water content, and litter were observed in the forest seasonally and inter-annually. Two years mean total annual soil CO2 efflux of the forest was estimated at 904.76 g C·m-2·y-1. The study revealed that sub-tropical forests could be more influenced by precipitation regimes in progressing warm climates i.e. vulnerable to climate change, illustrating the comprehensive dynamics of the representative forest carbon cycle in the tropical region.Keywords
This publication has 76 references indexed in Scilit:
- Factors Affecting Spatial Variation of Annual Apparent Q10 of Soil Respiration in Two Warm Temperate ForestsPLOS ONE, 2013
- Sensitivity of tropical carbon to climate change constrained by carbon dioxide variabilityNature, 2013
- Reinforcement in plantsNew Phytologist, 2013
- Roles of biotic and abiotic variables in determining spatial variation of soil respiration in secondary oak and planted pine forestsSoil Biology and Biochemistry, 2012
- The Dual Arrhenius and Michaelis–Menten kinetics model for decomposition of soil organic matter at hourly to seasonal time scalesGlobal Change Biology, 2011
- Response of soil respiration to precipitation during the dry season in two typical forest stands in the forest–grassland transition zone of the Loess PlateauAgricultural and Forest Meteorology, 2011
- Carbon dynamics and budget in a Zoysia japonica grassland, central JapanJournal of Plant Research, 2009
- Soil respiration and soil CO2 concentration in a tropical forest, ThailandJournal of Forest Research, 2004
- Substrate regulation of soil respiration in a tallgrass prairie: Results of a clipping and shading experimentGlobal Biogeochemical Cycles, 2003
- Seasonal variation of soil chemical properties and CO2 and CH4 fluxes in unfertilized and P-fertilized pastures in an Ultisol of the Brazilian AmazonGeoderma, 2002