论文部分内容阅读
There are many uncertainties in the estimation of forest car- bon sequestration in China, especially in Liaoning Province where vari- ous forest inventory data have not been fully utilized. By using forest inventory data, we estimated forest vegetation carbon stock of Liaoning Province between 1993 and 2005. Results showed that forest biomass carbon stock increased from 68.91 Tg C in 1993 to 97.51 Tg C in 2005, whereas mean carbon density increased from 18.48 Mg·ha -1 C to 22.33 Mg·ha -1 C. The carbon storage of young- and middle-aged forests in- creased by 22.1 Tg C and 5.95 Tg C, but that of mature forests has de- creased by 0.25 Tg C. The carbon stock and density of forests in Liaon- ing Province varied greatly in space: larger carbon storage and higher carbon density were primarily found in the east area. The spatial distribu- tion of carbon density was determined by many factors, of which human activities played an important role. The forests in Liaoning Province played a positive role as a sink of atmospheric carbon dioxide. The car- bon fixation ability of forests in this area was primarily derived from forest plantation and the total forest carbon sequestration can be en- hanced by expanding young- and middle-aged forests.
There are many uncertainties in the estimation of forest car-bon sequestration in China, especially in Liaoning Province where vari- ous forest inventory data have not been fully utilized. By using forest inventory data, we estimated forest vegetation carbon stock of Liaoning Province between 1993 and 2005. Results showed that forest biomass carbon stock increased from 68.91 Tg C in 1993 to 97.51 Tg C in 2005, mean carbon density increased from 18.48 Mg · ha -1 C to 22.33 Mg · ha -1 C. The carbon storage of young- and middle-aged forests-creased by 22.1 Tg C and 5.95 Tg C, but that of mature forests have been de creased by 0.25 Tg C. The carbon stock and density of forests in Liaon ing province varied greatly in space: The spatial distribu- tion of carbon density was determined by many factors, of which human activities played an important role. The forests in Liaoning Province played a positi ve role as a sink of atmospheric carbon dioxide. The car-bon fixation ability of forests in this area was were derived from forest plantation and the total forest carbon sequestration can be en- hanced by expanding young- and middle-aged forests.