| 水曲柳外径7cm年轮数选优方法研究 |
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| 引用本文： | 王永范,董元海,徐金民,杨辉,杨广生,周东良,李建忠.水曲柳外径7cm年轮数选优方法研究[J].吉林林业科技,2005,34(5):16-19. |
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| 作者姓名： | 王永范 董元海 徐金民 杨辉 杨广生 周东良 李建忠 |
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| 作者单位： | 1. 东北林业大学,黑龙江,哈尔滨,150040
2. 吉林省露水河林业局,吉林,白山,134506 |
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| 摘 要： | 种子园建园技术中，非常重要的一个环节就是选择优树。对于水曲柳而言，由于其材质比较坚硬，用生长锥钻到髓心测年龄很困难。根据树干解析材料，经过分析、研究、实践、比较后发现，水曲柳选优采用树干北面胸径外径7cm年轮数法既准确又简捷。即先在整个选优范围内随机选取水曲柳50株以上，钻取树干北面胸径外径7cm芯，查取年轮数，计算平均数与标准差，用平均数减去1倍标准差（40a）确定为选优标准。在选择优树时，当其它指标合乎要求后，年轮数小于40入选。
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| 关 键 词： | 水曲柳 年轮数 选优 选优方法 年轮 外径 树干解析 建园技术 选优标准 标准差 |
| 文章编号： | 1005-7129（2005）05-0016-04 |
| 收稿时间： | 2005-03-09 |
| 修稿时间： | 2005年3月9日 |
Superior tree selection to Fraxinus mandshurica by counting ring of external diameter in 7 cm |
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| WANG Yong -fan,DONG Yuan- hai,XU Jin -min,YANG Hui,YANG Guang- sheng,ZHOU Dong- liang,LI Jian -zhong.Superior tree selection to Fraxinus mandshurica by counting ring of external diameter in 7 cm[J].Jilin Forestry Scicnce and Technology,2005,34(5):16-19. |
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| Authors: | WANG Yong -fan DONG Yuan- hai XU Jin -min YANG Hui YANG Guang- sheng ZHOU Dong- liang LI Jian -zhong |
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| Institution: | 1.Northeast Forestry University, Harbin 150040, China; 2. Lushuihe Forestry Bureau of Jilin Province, Baishan 134506, China |
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| Abstract: | It's a very important link to choose superior tree in establishing clonal seed orchard.Fraxinus mandshurica tree age is hard to determinate by growth cone for its tougher wood quality.An easy and accurate method was summarized in studying data of analyzed tree,that is to count tree-ring of external diameter in 7 cm towards northern sides.Stochastic sampling number should be controlled above 50 trees within the range of selection,the difference between average and double standard deviations is the standard of selecting superior tree.These trees of ring number less than 40 may pass the selection. |
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| Keywords: | Fraxinus mandshurica ring number superior tree selection |
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