| 马尾松人工林生物量及生产力变化规律研究Ⅱ.不同林龄生物量及生产力 |
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| 引用本文： | 丁贵杰,王鹏程.马尾松人工林生物量及生产力变化规律研究Ⅱ.不同林龄生物量及生产力[J].林业科学研究,2002,15(1):47-53. |
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| 作者姓名： | 丁贵杰 王鹏程 |
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| 作者单位： | 1. 贵州大学造林生态研究室,贵州,贵阳,550025
2. 华中农业大学林学系,湖北,武汉,430070 |
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| 摘 要： | 采用以空间代时间的径级标准木收获法,研究了从幼林到成熟林的5种不同林龄的林分生物量.结果表明:树木干物质是按一定比例分配到各器官,其比例与径阶大小无关,而与发育阶段有关.林分平均木及林分各器官生物量均随林龄增加而增加,平均木在18 22a生物量年增加速率最大,而林分是在12 18年生.树干生物量所占百分比(占48%以上)随林龄增加而增加,而枝、叶、皮刚好相反,18年生以前,根所占百分比随林龄增加而下降,此后趋于稳定.各器官所占百分比由大到小依次为:干、枝、根、皮、叶.8、12、18、22、30年生的林分乔木层生物量分别为:33.94、89.94、204.51、223.71、234.14t.hm-2,净生产力为:6.24、11.14、15.63、14.07、11.93t.hm-2.a-1.中龄前,生物量按径阶分布的规律与株数按径阶分配规律相似,多呈左偏态,此后呈右偏态,峰值比株数按径阶分布向右移动1 2个径阶.培育纸浆材林,在18年生前利用最佳.
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| 关 键 词： | 马尾松 人工林 林龄 生物量 生产力 变化规律 |
| 收稿时间： | 8/6/2000 12:00:00 AM |
Study on the Early Multiplicative Ratio in vitro of Acacia mangium Plus Trees |
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| DING Gui jie and WANG Peng cheng.Study on the Early Multiplicative Ratio in vitro of Acacia mangium Plus Trees[J].Forest Research,2002,15(1):47-53. |
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| Authors: | DING Gui jie and WANG Peng cheng |
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| Institution: | Research Division of Silviculture and Ecology, Guizhou University, Guiyang 550025, Guizhou, China.;Huazhong Agricultural University, Wuhan 430070, Hubei, China |
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| Abstract: | Stand biomass and productivity of five stands with different ages from young growth to mature forest had been studied by the methods of diameter class sample tree in which we substitute space distribution of stand for progress of time. The results showed that tree biomass was allocated to each organ according to definite percentage, the percentages were not relative to diameter class, but relative to stand age. With stand age increasing, biomass of stand average tree and each organ increase. The annual growth speed of biomass is the biggest at 18 22 year for stand average tree, but the biggest at 12 18 year for the stand. With stand age increasing, the percentage(above 48%) of stem biomass increases, but that of branch, leaf and bark are on the contrary. When time is shorter than 18 year, with stand age increasing, the percentage of root decreases, then it tends to be stable. The percentage orders of each organ biomass are stem>branch>root>bark>leaf. Stand(stem) tree stratum biomass and net productivity of stands at the age of 8, 12, 18, 22, 30 are 33.94(16.39),89.94(52.60),204.51(134.52), 223.71 (150.96),234.12(158.94) t·hm-2 and 6.24(2.05),11.14(4.38),15.63(7.47),14.07 (6.86),11.93(5.30) t·hm-1 ·a-1 individually. The diameter class distribution laws of biomass are similar to that of tree, many of them are left offset prior to hail mature forest, since then it tends to right side, its peak is moved 1 2 diameter class to right. Pulewood stand should be cut by 18 years old. |
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| Keywords: | masson pine forest plantation stand age biomass productivity |
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