仁用杏林生物量研究

Biomass of Kernel-apricot Plantation

为探究退耕还林树种仁用杏的固碳价值,进行仁用杏不同林龄生物量特征研究。采用标准木法（乔木层）和样方收获法（草本层、枯落物层）分别获取6年（初产期）、12年（盛产期）、18年（盛产后期）生张家口小五台山地区仁用杏生物量,并分析其结构组成、分配规律和变化趋势。结果表明,不同林龄仁用杏林的总生物量随着年龄的增大而增加,6、12、18年仁用杏生态系统总生物量分别为17.70、31.43、50.53 t/hm2。在整个生态系统中,乔木层生物量占绝对优势,分配率高达85.45%~96.11%,按林龄从小到大分别为14.99、30.19、44.97 t/hm2,其次为草本层,占1.46%~9.68%,枯落物层所占比重最小,仅为2.43%~5.58%。不同林龄乔木层各器官生物量分配规律不同,6年生为枝〉干〉根〉叶〉果实,12、18年均表现为枝〉根〉干〉果实〉叶。仁用杏器官生物量分配规律与用材林及其他经济林均有较大差异。

In order to explore the carbon storage value of returning farmland to forest tree species, the biomass and its allocation of kernel-apricot plantations at different forest ages were studied. The sample trees （tree layer） and sample plots （herb and litter layer） harvest method were adopted to get the biomass at different ages （6, 12, 18 a） of kernel-apricot plantations in Xiaowutai region of Zhangjiankou, and the structure, distribution regularity and changing trends were analyzed. The results showed that, the ecosystem biomass of kernel- apricot was 17.70, 31.43, 50.53 t/hm2 at 6, 12, 18 a, respectively, and increased with the increasing age. Most biomass （85.45%-96.11%） of kernel-apricot plantation was concentrated in the tree layer, and the biomass was 14.99, 30.19, 44.97 t/hm2 at 6, 12, 18 a in the tree layer, respectively. The next was the herb layer which made up 1.46% to 9.68%; litter biomass contributed the smallest, just made up 2.43% to 5.58%. The organic biomass allocations were different between young and middle as well as old plantations, the organic biomass allocation was branch〉 stem〉 root〉 leaf〉 fruit at 6 a, and branch〉 root〉 stem〉 fruit〉 leaf at 12 and 18 a. There was a significant difference between the organ biomass distribution of kernel-apricot and other species of timber forest and economic forest.