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采用乡土珍贵阔叶树种改造大面积针叶人工纯林已经成为我国亚热带地区人工林近自然化经营的有效模式.采用样地调查与生物量实测方法,研究了我国南亚热带广西3个不同林龄红锥人工林(10、20和27年生)的不同器官、凋落物层和土壤层的碳含量,以及不同林龄红锥人工林的乔木层、凋落物层和土壤层碳贮量及其分配特征.结果表明:红锥不同器官碳含量为49.7%～57.9%;凋落物层碳含量为40.8%～50.5%,而且未分解层>半分解层;土壤层(0～60cm)碳含量随林龄增加而增大,随土层深度的增加而下降.10、20和27年生红锥人工林碳贮量分别为182.42、234.75和269.75t·hm-2,其中,乔木层分别占19.8%、32.0%和32.8%,凋落物层分别占1.5%、1.6%和1.3%,土壤层分别占78.7%、66.4%和65.9%.3个红锥人工林的年净固碳量分别为4.70、5.64和5.18t·hm-2.红锥具有较高的固碳能力,是发展多目标森林经营模式的理想树种.
The transformation of large-area artificial coniferous forest with large-area native hardwood species has become an effective model for near-natural plantation management in subtropical regions of China. By using plots survey and biomass measurement methods, three different ages of Guangxi Carbon content in different organs, litter layers and soil layers in coniferous plantations (10, 20 and 27 years old), and carbon stocks and their distribution characteristics in arbor, litter and soil layers in red-cone plantations of different ages The results showed that the carbon content of different organs of red cone was 49.7% -57.9%, the carbon content of litter layer was 40.8% -50.5%, and the undecomposed layer> semi-decomposed layer. The carbon content of soil layer (0-60cm) Increased with the soil depth and decreased with the increase of soil depth.The carbon stocks of red cone plantations of the 10, 20 and 27 years were 182.42, 234.75 and 269.75 t · hm-2, respectively, of which, the tree layers accounted for 19.8% and 32.0 % And 32.8%, litter layer accounted for 1.5%, 1.6% and 1.3% respectively, and soil layer accounted for 78.7%, 66.4% and 65.9% respectively.The annual net carbon sequestration of the three red cone plantations were 4.70 and 5.64 and 5.18t · hm-2. Red cone has a high carbon sequestration ability and is an ideal tree for developing multi-objective forest management model .