云南红河流域麻疯树人工幼龄林碳密度与分配特征

Abstract: Stand density of Jatropha curcas and the soil organic carbon content ratio of different organs compared to the whole plant in the Honghe Region，Yunnan Province was determined. Using the mean tree sampling method（20 m 20 m） a regression equation for estimating biomass of different organs in young stands was established，and carbon content ratios were determined with a VARIO EL elemental analyzer. Then vegetative biomass and organic carbon allocation of the stand were calculated. Results showed that the best regression equation for calculating the biomass of young J. curcas was y = 25.005（D2H）0.952. Based on this equation and the sampling plots，biomass of the young forest was 26.03 thm-2. Carbon content ratios for the different organs ranged between 39.35% － 56.74% with fruit = 56.74%，stems = 45.87%，roots = 45.12%，leaves = 39.35%，and the mean carbon content ratio for the whole plant = 47.3%. Also，carbon density was：J. curcas = 5.54 thm-2，shrub-grass = 3.78 thm-2，and litter = 2.59 thm-2. Additionally，the organic carbon content ratio was highest （16.61 gkg-1） at the 0 － 10 cm soil layer depth.［Ch，2 fig. 3 tab. 25 ref.］