研究生物质能源树种千年桐人工林乔木层生物量特征及其分配规律.采用样地调查和标准木收获法测定2a、3 a、5a、7a、9a生千年桐人工林乔木层生物量,建立千年桐人工林乔木层生物量回归模型,其全株的相关系数为0.980 1,其他组分相关系数均在0.9093以上,具有良好的相关性.结果表明:2a、3a、5 a、7 a、9a生林分乔木层生物量分别为41.162t/hm2,51.15 t/hm2,58.656 t/hm2,114.005 t/hm2,134.894 t/hm2,9a生林分乔木层生物量是分别7a,5a,3 a,2a生林分的1.183倍,2.300倍,2.637倍,3.277倍.各器官生物量分配中,9 a生林分的树杆对乔木层生物量贡献最大,达到41.09％,贡献率最小的是2a生林分,为38.54％；7 a生林分的树枝对乔木层生物量贡献率最大,达到26.1％,贡献率最小的是5a生林分,为22.8％；5 a生林分的树叶对乔木层生物量贡献率最大,为13.72％,贡献率最小的是7a生林分,为10.38％；7 a生林对林分的树根生物量贡献率最大,为23.68％,贡献率最小的是9a生林分,为21.52％.乔木层的生物量主要以树杆为主,杆、枝、叶、根的生物量均表现出明显随林龄增长而递增的规律.%The biomass characteristics and distribution in the arbor layer were focused on in the study of Aleurites Montana as a bio-energy species. The arbor layer biomass of Aleurites Montana plantations of 2a, 3a, 5a, 7a and 9 a were determined by the method of field study and standard tree yield. Meanwhile, in the regression equation of arbor layer biomass as W = a(D2H)b, the correlative coefficient of total stem was 0. 980 1 and those of other organs were above 0. 909 3, showing positive correlation. The results showed that the arbor layer biomass of 2 a, 3 a, 5 a, 7 a and 9 a Aleurites Montana were determined respectively as 41. 162 t/hm , 51. 15 t/hm , 58. 656 t/ hm2, 114.005 t/hm2 and 134.894 t/hm2. The arbor layer biomass of 9 a Aleurites Montana was respectively 1. J83, 2. 300, 2. 637 and 3. 277 times more than that of 7 a, 5 a, 3 a and 2 a. In arbar layer biomass distribution, the stems of 9 a occupied the highest proportion as 41.09% while those of 2 a occupied the lowest as 38. 54% ; the branches of 7a occupied the highest as 26. 1% while those of 5 a occupied the lowest as 22. 8% ; the leaves of 5 a occupied the highest as 13. 72% while those of 7 a occupied the lowest as 10. 38% ; the roots of 7 a occupied the highest as 23. 68% while those of 9 a occupied the lowest as 21. 52%. Stem biomass contributed the most in arbor layer biomass and the biomass of stems, branches, leaves and roots obviously presented the increasing tendency with the aging of the stand.
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