对福建永春牛姆林自然保护区内22a生的闽粤栲(Castanopsis fissa)、丝栗栲(Castanopsis fargesii)、拉氏栲(Castanopsis lamonteii)不同器官的灰分含量、去灰分热值和碳含量进行对比分析,并估算各树种人工林的碳储量和能量现存量。结果表明:3种栲属树种各器官灰分含量总体表现为叶>根>枝>干,各器官平均灰分含量则表现为拉氏栲>丝栗栲>闽粤栲;各树种各器官去灰分热值总体表现为叶>枝>干>根,各器官平均去灰分热值则表现为拉氏栲>闽粤栲>丝栗栲;各树种各器官碳含量均表现为干>枝>根>叶,各器官平均碳含量则表现为闽粤栲>丝栗栲>拉氏栲;各树种各器官间的灰分含量、去灰分热值和碳含量总体差异均达到显著水平(t检验,P<0.01);除了碳含量与去灰分热值呈极显著正相关外,其他各指标间无显著相关性;3种栲属树种人工林碳储量和能量现存量表现为为闽粤栲>丝栗栲>拉氏栲,在低产低效林分改造中可优先考虑闽粤栲。

Ash contents(ASC),ash free caloric values(AFCV)and carbon contents(CAC)of different organs from three species of Castanopsis in Niumulin Nature Reserve experimental region were comparatively studied and carbon stock and standing crop of energy of each tree species plantation,simultaneously,estimated.These three 22-year-old species of Castanopsis were Castanopsis fissa,Castanopsis fargesii,Castanopsis lamonteii.The results showed that ASC increased in the order of leaves,root,branch,trunk for these three species of trees,average ASC of these three species of trees increased in the order of C.lamonteii,C.fargesii,C.fissa.AFCV increased in the order of leaves,branch,trunk,root for these three species of trees,average AFCV of these three species of trees increased in the order of C.lamonteii,C.fissa,C.fargesii.CAC increased in the order of trunk,branch,root,leaves for these three species of trees,average CAC of these three species of trees increased in the order of C.fissa,C.fargesii,C.lamonteii.Difference of ASC,AFCV and CAC were significant among different organs of these three species of trees by t test(P<0.01).In addition to the fact that CAC and AFCV were extremely significant positive correlation,other indexes had no significant correlation.Carbon stock and standing crop of energy of these three species plantation increased in the order of C.lamonteii,C.fargesii,C.fissa.