Relative contributions of soil, foliar, and woody tissue respiration to total ecosystem respiration in four pine forests of different ages
- Amer Geophysical Union
- Publication Type:
- Journal Article
- Khomik Myroslava et al. 2010, 'Relative contributions of soil, foliar, and woody tissue respiration to total ecosystem respiration in four pine forests of different ages', Amer Geophysical Union, vol. 115, no. 1, pp. G03024-1-G03024-17.
- Issue Date:
Carbon dioxide (CO2) emissions from soil, foliage, and live woody tissue were measured throughout the year in afforested, white pine (Pinus strobus L.) stands (67, 32, 17, and 4 years old as of 2006), growing in a northern temperate climate. The data were used to estimate annual ecosystem respiration (Re) and its component fluxes, including soil, foliar, and woody tissue respiration; to investigate major environmental factors causing intersite and temporal variability in the observed fluxes; and to compare chamber-based Re estimates with eddy covariance-based estimates. While temperature was the dominant driving factor of temporal variability in component fluxes, intersite variability in CO2 emissions was attributed to differences in stand physiological characteristics, such as the presence of the LFH soil horizon, its carbon-to-nitrogen ratio, and the amount of canopy cover. Additional factors that contributed to flux variability included the frequency of precipitation events, vapor pressure deficit and stem diameter, depending on the component considered. Estimated annual chamber-based totals of Re across the four stands were 1526 ? 137, 1278 ? 137, 1985 ? 293, and 773 ? 46 g C m-2 yr-1 for the 67-, 32-, 17-, and 4-year-old stands, respectively. Soil respiration dominated emissions at the 4-year-old stand, while foliar respiration dominated emissions at the 17-year-old stand.
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