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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.
The results showed that: Compared with the control (CK), the Q. mongolica forest was planted in the Quercus variabilis plantations with wide distribution in Jianghuai Hilly Region, Compared with the control, the carbon density of trees with 15% thinning (T15), 30% thinning (T30) and 50% thinning (T50) increased by 9.1%, 29.6% and 28.4% The characteristics of stems, stems, roots, branches, barks and leaves of the forest litter decreased with the increase of thinning intensity, and the carbon density of soil (0-50 cm) increased slightly. However, the litter and soil carbon density Compared with CK, the total carbon density of the stands was T30> T50> T15> CK, and the total carbon density increased by 16.3, 14.5 and 3.6tC.hm-2, respectively, compared with CK, There were no significant differences among the treatments.The soil respiration of the thinning treatments T15, T30 and T50 were all higher than that of CK, only the difference between T30 and CK was significant.Under the Jianghuai hilly region, Among them, 30% of thinning the most suitable forest carbon storage accumulation.