Soil Organic Carbon Contents and Its Vertical Distribution in Four Forest Ecosystems of Changsha

摘要

Accurate estimates on the size of terrestrial organic carbon stocks are necessary for understanding their importance in regulating atmospheric CO2 concentrations. In this paper bio mass and soil organic carbon(SOC) contents in urban forest (Pinus massoniana Lamb; Cinnamomum camphora ; Cunninghamia lanceolata Hook; Liquidambar formosana Hance.) in Changsha were estimated. The results were as follows: there were significant differences in the biomass between conifer forest and broadleaf forest. Biomass of the Pinus massoniana and Cunninghamia lanceolata were 36.52 t/hm2 and 16.28 t/hm2 respectively, whereas biomass of Cinnamomum camphora and Liquidambar formosana were 84.35 t/hm2 and 127.27 t/hm2 respectively. Significant differences in SOC content were found between Pinus massoniana and Liquidambar formosana. Soil moisture was an important factor that resulted in spatial difference of SOC in Pinus massoniana and Cunninghamia lanceolata forests.Most of the SOC of four forest ecosystems was in the upper 15cm of soil profile. SOC contents of Cinnamomum camphora and Liquidambar formosana are deeper than Pinus massoniana and Cunninghamia lanceolata.