The carbon storage and distribution patterns of Castanopsis kawakamii Hayata plantation ecosystem

A study was carried out to analyse the carbon density, storage and accumulation pattern of 27 years old standing forest of Castanopsis kawakamii Hayata plantation ecosystem in Liangfengjiang forestry park, Nanning, Guangxi province. The results showed thatthe average carbon content in different organs in tree layer of C. kawakamii plantation stands range from 459.6~ 491.9 g/kg, and decreased in the order as deadwood stick>stem>major root>medium root>coarse root>great branches>twigs>coarse root>leaf. The carbon content in different organs in tree layer were significant different. The total storage of carbon distribution of the C. kawakamii plantation ecosystems were in the order of soil layer>tree layer>shrub layer>herbal layer. The carbon density in the soil layer was decreasing by the increase of soil deepness gradually, the carbon content was mainly concentrated in 0~40 cm of soil than other layers. The total carbon storages of C. kawakamii plantation ecosystems was 206.96 t/hm2. And tree layer, shrub layer, field layer and litter layer took 39.61%,2.53%, 0.14%, 0.54% of the total storage respectively, and the soil layer accounted for 57.18%. Stem accumulated the highest carbon storage in vegetation layer, the amount was 43.24 t/hm2, comprised 20.89% of the carbon storage by the total storage. The annual net productivity of 27-year-old Castanopsis kawakamii plantation was 21.51 t/hm2袁and annual carbon fixation was up to 8.80 t/hm2, and net carbon accumulation was 3.05 t/hm2. It has a high potential of carbon sequestration .