Soil heterotrophic respiration in Casuarina equisetifolia plantation at different stand ages

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.

Keywords

soil heterotrophic respiration / coastal plantation / stand age / Casuarina equisetifolia

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