Spatial Distribution of Carbon Storage of Three Forests Ecosystem in Guangzhou,China

The authors have investigated the content,storage and spatial distribution of carbon in Castanopsis fissa,Schima superba,Cunninghamia lanceolata forest ecosystems of Liuxihe Forest Farm,which is in Guangzhou City,Guangdong Province,China. The resuts showed that average carbon concentrations of different organs were Cunninghamia lanceolata( 490. 99 g·kg- 1) Castanopsis fissa( 447. 18 g·kg- 1) Schima superba( 442. 52 g·kg- 1). There were differences between each organs,varied with tree organs in the same tree species. The different organs of Cunninghamia lanceolata forest decreased in the order of bark leaf branch trunk root; while it was trunk root bark branch leaf of Schima superb and leaf trunk branch root bark of Castanopsis fissa. The order of tree layer carbon storage were Castanopsis fissa( 103. 08 t·hm- 2) Schima superba( 83. 19 t·hm- 2) Cunninghamia lanceolata( 20. 67 t·hm- 2). The amount of carbon were shrub herb litter-fall layers. Soil bulk density increased along with the deepening of soils,while the carbon content declined and uneven distribution. The surface layer( 0 to 25 cm) soil carbon content was higher than the other layers,carbon content in the soils were Schima superb( 154. 52 t·hm- 2) Castanopsis fissa( 146. 75 t·hm- 2) Cunninghamia lanceolata( 131. 29 t·hm- 2). Carbon stocks in the different components of the three forest ecosystems were in an order as: soil vegetation litter-fall. The annual net primary productivity was estimated to be 9. 22 t·hm- 2·a- 1in the Castanopsis fissa forests,which was 1. 32 times of Schima superb forests and 1. 97 times of Cunninghamia lanceolata forests. The annual carbon storage was 4. 12 t·hm- 2·a- 1of Castanopsis fissa forests and 3. 08 t·hm- 2·a- 1of Schima superb forests,which was 1. 79 times and 1. 34 times of Cunninghamia lanceolata. The tree layer assimilation ability of CO2was Castanopsis fissa Schima superba Cunninghamia lanceolata. Carbon sequestration ability of broad-leaved forests such as Castanopsis fissa( 25 a) and Schima superba( 27 a) was better than the coniferous forest as Cunninghamia lanceolata( 9 a).