The Study On Characteristices Of Carbon Storage Of Evergreen Broad-leaved Forest In Jiangxi Provinces

The aim of this study was to investigate the carbon storage of main vegetation types of the evergreen broad-leaved forests based on50sample plots in Jiangxi Province from2012to2014. Each layer (tree, understory, litter and soil) of forest ecosystem was sampled and determined using field measurement methods. Our results showed as follows:1. The values of ecosystem carbon pool of native evergreen broad-leaved forest and secondary evergreen broad-leaved forest in Jiangxi Province was378.86,234.99t· hm-2, respectively. The proportion of tree layer carbon pool has reduced from42.09%to31.30%, while the proportion of soil pool has increased from52.91%to65.40%, which suggested that cutting disturbance may influence significantly the carbon storage and its distribution in evergreen broad-leaved forest ecosystem.2. The value of community carbon pool in castanopsis fargesii forests、schima superb forests and castanopsis eyrei forests, three typical subtropical evergreen broad-leaved forests in middle subtropical zone, was183.63,175.68and187.29t· hm-2,respectively. Net primary productivity of the ecosystem (NPP) pool in castanopsis fargesii forests、 schima superb forests and castanopsis eyrei forests was17.69,15.65and14.69t· hm-2a-1, respectively. They all had no significant differences, indicating that community types made no difference to community carbon pool and NPP in Jiangxi province.3. By comparing the forest ecosystem community carbon pool of three national nature reserves in Jiangxi province’s south, middle and north (Jiulianshan, Jingangshan and wuyishan), we found that ecosystem community carbon pool in subtropical evergreen broad-leaved forests decreased from south to north in Jiangxi province. By compiling and analysis the datasets from published literature and this study, we found that, subtropical evergreen broad-leaved forest’s carbon pool had a significant negative correlation with latitude (y=-9.1672x+420.9, R2=0.1691, P=0.080), but it had no correlation with longitude (y=-1.3092x+332.66,R2=0.0098,P=0.687), which indicated that the differences in climate caused by latitudinal zonality was likely to be the main factor influencing the evergreen broad-leaved forest ecosystems community carbon storage on a large scale.4. The value of ecosystem carbon pool in evergreen broad-leaved forests within different recovery stages (15years,30years,50years and climax community) was160.63,191.32,232.95,270.67and419.70t·hm-2, respectively. Ecosystem carbon pool increased by161.3%in the whole process. Succession not only affected the size of evergreen broad-leaved forest ecosystem’s carbon pool, but also influenced the variation of carbon pool’s distribution.