不同间伐强度下麻栎人工林碳密度及其空间分布  

Carbon density and its spatial distribution in Quercus acutissima plantations under different thinning intensities

作　　者：成向荣[1] 虞木奎[1] 葛乐[1] 张春祥 王婉[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400 [2]安徽省滁州市南谯区红琊山林场,安徽滁州239000

出　　处：《应用生态学报》2012年第5期1175-1180,共6页Chinese Journal of Applied Ecology

基　　金：国家引进国际先进林业科学技术项目(2008-4-50);林业公益性行业科研专项(20070403)资助

摘　　要：选择江淮山地丘陵区分布较广的麻栎人工林进行间伐试验,通过样地调查,分析不同间伐处理5年后麻栎林分的碳密度及其空间分布特征.结果表明:与对照(CK)相比,间伐15%(T15)、间伐30%(T30)和间伐50%(T50)处理的树木碳密度分别增加9.1%、29.6%和28.4%,不同间伐处理树木碳密度在各器官的分配特征均为树干>根系>树枝>树皮>树叶.随着间伐强度的增加,林地凋落物碳密度逐渐降低,土壤(0～50cm)碳密度略有增加,但凋落物和土壤碳密度在间伐与未间伐处理之间均未达到显著差异.林分总碳密度大小为T30>T50>T15>CK,总碳密度分别比CK增加16.3、14.5和3.6tC.hm-2,但间伐与未间伐处理之间没有显著差异.T15、T30和T50间伐处理的土壤呼吸均高于CK,仅T30处理与CK之间差异显著.在江淮山地丘陵区,间伐有利于麻栎人工林碳密度的增加,其中以间伐30%最适宜林分碳储量的累积.Quercus acutissima is a tree species widely planted in Jianghuai hilly lands. In this study, the Q. acutissima plantations after five years of different thinning [ 15% （T15 ）, 30% （T30）, 50% （ T50 ） and un-thinning （CK） ] were selected, and a sampling plot investigation was made to analyze the carbon density and its spatial distribution in these plantations. In treatments T15, T30 and T50, the tree carbon density increased by 9.1%, 29.6% and 28.4%, respectively, as compared with CK. The carbon density in tree organs was in the order of stem 〉 root 〉 branch 〉 bark 〉 leaf. With increasing thinning intensity, the carbon density in litters decreased while that in 0-50 cm soil layer had a slight increase, but no significant difference was observed between thinning and un-thinning. The total carbon density of the Q. acutissima stands under different thinning intensities was in the order of T30 〉 T5o 〉 T15〉 CK, with an increase of 16.3, 14. 5 and 3.6 t C ~ hm-2 in treatments T^5, T3o and Tso, respectively, as compared with CK, but there were no significant differences among the treatments. In treatments T15, T30 and T50, soil respiration was also higher than that in CK, and the difference was significant between treatments T30 and CK. Overall, thinning was helpful to the enhancement of carbon storage in the Q. acutissima plantations in Jianghuai hilly lands, and 30% thinning could be the best.

关 键 词：麻栎 间伐 碳密度 生物量 

分 类 号：S792.181[农业科学—林木遗传育种]