Abstract
The soil respiration rates (R h) in 6-year-old (young), 17-year-old (middle-age), 31-year-old (mature) Casuarina equisetifolia coastal plantations were measured using an LICOR-8100 automated soil CO2 flux system from May 2006 to April 2007. Results show that R h displayed an obvious seasonal pattern across the observed years. The maximum values of R h occurred at June and July and the minimum at December and January. Soil temperature and soil moisture as well as their interaction had significant effects on the monthly dynamics of R h. The analysis by one-way ANOVA showed that R h had a significantly exponential relation (p<0.05) to soil temperature at soil depth of 5 cm, and had a linear relation (p<0.05) to soil water content of the upper 20 cm. The result estimated by the two-factor model shows that soil temperature at soil depth of 5 cm and soil moisture at soil depth of 20 cm could explain 68.9%–91.9% of seasonal variations in R h. The order of R h rates between different stand ages was middle-age plantation>mature plantation>young-age plantation. With the increase of growth age of plantation, the Q 10 of R h increased. The contribution of R h to total soil surface CO2 flux was 71.89%, 71.02% and 73.53% for the young, middle-age and mature plantation, respectively. It was estimated that the annual CO2 fluxes from R h were 29.07, 38.964 and 30.530 t·ha−1·a−1 for the young, middle-age and mature plantation, respectively.
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Foundation project: The research was supported by Key Projects in the National Science & Technology Pillar Program during the Eleventh Five-year Plan Period (Nos. 2006BAD03A14-01); Important Science & Technology Specific Projects of Fujian province (2006NZ0001-2) and supported by the Key Laboratory of south mountain timber cultivation, state forestry administration, P. R. China.
Biography: XIAO Sheng-sheng (1981–), Male, Ph.D candidate in Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, P. R. China.
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Xiao, Ss., Ye, Gf., Zhang, Lh. et al. Soil heterotrophic respiration in Casuarina equisetifolia plantation at different stand ages. Journal of Forestry Research 20, 301–306 (2009). https://doi.org/10.1007/s11676-009-0052-9
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DOI: https://doi.org/10.1007/s11676-009-0052-9