大岗山毛竹林与常绿阔叶林碳储量及分配格局

Carbon storage and allocation of Phyllostachys edulis forest and evergreen broad-leaved forest in Dagangshan Mountain,Jiangxi

基于固定样地,对江西大岗山毛竹林与常绿阔叶林生态系统碳储量及分配格局进行了研究。结果表明：毛竹各器官碳含量介于42.22%~47.53%,其大小顺序依次为秆（47.53%）〉枝（46.49%）〉鞭（46.10%）〉根（45.30%）〉叶（42.22%）。丝栗栲不同器官碳含量介于43.09%~45.53%,其干、叶、枝、根的碳含量依次为45.53%、44.96%、43.63%和43.09%,其它植物各器官介于40.21%~49.54%之间。毛竹林与常绿阔叶林土壤从表层0至100 cm碳含量分别为3.62%~0.43%和4.15%~0.58%;从上到下依次降低,表层（0~20 cm）土壤碳素含量最高。两种森林生态系统碳储总量分别为226.75 tC.hm-2和267.94 tC.hm-2,前者低于后者,但其碳储量空间分布格局基本一致,土壤层占主要部分,分别为143.80 tC.hm-2和173.93 tC.hm-2,分别占63.42%和64.23%,其次为乔木层,分别占26.36%和33.12%,林下植被层和凋落物层所占比例最小,不足2%。毛竹林和常绿阔叶林植被年固定碳量分别为4.76 tC.hm-2.a-1和4.15 tC.hm-2.a-1,分别相当于17.45 tCO2.hm-2.a-1和15.22 tCO2.hm-2.a-1,毛竹林年固碳量高于常绿阔叶林。

Based on the permanent plot and investigation,the biomass,carbon storage and its allocation of Phyllostachy edulis forest and evergreen broad-leaved forest were studied.The results showed that the mean carbon concentrations among tree species were significantly different.The average carbon concentration in organs of Ph.edulis changed in the order of culm（47.53%）branch（46.49%）rhizome（46.10%）root（45.30%）leaf（42.22%）,in the order of trunk（45.53%）leaf（44.96%）branch（43.63%）root（43.09%）for Castanopsis fargesii,and 40.21%-49.54% for different organs of other woody species.The carbon concentration of soil of 2 forests are 4.15%-0.58% and 3.62%-0.43% from 0 to 100 cm depth respectively,with higher carbon concentration and storage in the layer of 0-20 cm than in the other layer.The total carbon storage of Ph.edulis forest and broad-leaved forest were 226.75 tC·hm-2 and 267.94 tC·hm-2 respectively.The spatial distribution pattern of carbon storage was basically consistent in the order of soil layertrees layershrub and herb and litter layer.The carbon storage and its allocation among their organs in tree layer were found to be highly correlated with their biomass.Annual carbon fixation of plant layers in Ph.edulis forest was 4.76 tC·hm-2·a-1,amounted to 17.45 tCO2·hm-2·a-1,higher than that of evergreen broad-leaved forest of 15.22 tCO2·hm-2·a-1.