桃江县毛竹林生态系统碳储量及其空间分布

采用标准地调查和生物量实测方法,研究了湖南省桃江县毛竹林生态系统生物量、碳含量、碳储量及空间分布格局。结果表明,不同年龄毛竹林生态系统总生物量分别为:28.147、30.889 t/hm~2和57.763 t/hm~2,其中竹林层生物量为20.254、25.036、55.685 t/hm~2,各器官生物量均以竹竿最高,占器官生物量的63.0%以上。不同年龄毛竹各器官碳平均含量为0.466—0.483 g C/g;灌木层碳含量为0.474—0.489 g C/g;草本层为0.472—0.490 g C/g;死地被物层为0.213—0.276 g C/g;土壤层有机碳含量为14.790—34.503 g C/g。各年龄毛竹林生态系统总碳储量分别为131.273、139.089 t/hm~2和167.817 t/hm~2,其中植被层碳储量为13.627—28.419 t/hm~2,占系统总碳储量的9.935%—16.935%;死地被物为0.307—0.420 t/hm~2,占0.234%—0.265%;土壤层为117.339—138.978 t/hm~2,占82.815%—89.799%。毛竹林生态系统碳储量分布格局为:土壤层植被层死地被物层。研究结果可为深入研究毛竹林的碳平衡提供基础数据。

Distribution of biomass and carbon storage in different aged stands of Moso Bamboo plantations in Taojiang, Hunan

In this study, the biomass and carbon concentrations were measured and the carbon storages were estimated in various plant organs and components of different aged stands of Moso bamboo plantations in Taojiang county, Hunan province. The objective of the research project was to quantify the special distribution of biomass and carbon storage in bamboo forest ecosystems in order to better understanding of the dynamic property of biomass production and carbon cycle in the plantation ecosystems. The results showed that (1) the standing biomass increased with aged plantations. The standing biomass was 28.15, 30.89, and 57.76 t/hm² in three studied aged stands, respectively, of which the stem organ accounted for the highest proportion of the total standing biomass for all aged stands, with an average value of 63%; (2) the carbon storage increased with aged stands, ranging from 131.27 t/hm² to 167.82 t/hm² in the three different aged Moso bamboo plantations. The carbon concentrations in plant organs varied with tree aging and ranged from 0.466 gC/g to 0.483 gC/g. The range of carbon concentrations was 0.474-0.489 gC/g in the shrub layer, 0.472-0.490 gC/g in the herbaceous layer, 0.213-0.276 gC/g in the litter layer, and 14.790-34.503 gC/g in soils; (3) the total carbon storage was 131.27, 139.09, and 167.82 t/hm² in the three different aged Moso bamboo plantation ecosystems, respectively, of which 13.63-28.42 t/hm² was found in the vegetation layer and 0.307-0.420 t/hm² in the litter layer, respectively, which accounted for 9.94%-16.94% and 0.23%-0.27% of the total carbon storage in the plantation ecosystems. Carbon storage in soils ranged from 117.34 t/hm² to 138.98 t/hm², which accounted for 82.82%-89.80% of the total carbon in the ecosystems. The carbon storage in different components declined in an order soil layer > vegetation layer > litter layer in all studied Moso bamboo plantation ecosystems. Our results provide scientific references for further studying of carbon cycle and sequestration in bamboo forests.