| 水曲柳前4 级细根 N 内循环的研究 |
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| 引用本文： | 黄石竹,;张彦东,;王政权,;孙晓新.水曲柳前4 级细根 N 内循环的研究[J].森林工程,2014(4):9-11. |
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| 作者姓名： | 黄石竹 ;张彦东 ;王政权 ;孙晓新 |
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| 作者单位： | [1]黑龙江生态工程职业学院生态工程系,哈尔滨150025; [2]东北林业大学林学院,哈尔滨150040 |
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| 基金项目： | 国家重点科技攻关项目（2011BAD37802） |
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| 摘 要： | 以黑龙江省东北林业大学帽儿山实验林场20年生水曲柳（Fraxinusmandshurica）人工纯林为研究对象，运用根序分级方法将水曲柳细根划分四个等级，将各等级活根与死根间的氮（N）含量（μg/cm）差异加以比较，研究水曲柳各级根序死亡脱落前是否发生N的内循环，并量化各级根序细根的N内循环率。结果显示：水曲柳一级根和二级根不存在N内循环，三级根和四级根有N内循环发生，内循环率分别为26．03％和50．93％。本研究结果表明：研究细根N内循环，应该考虑根序因素的影响。
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| 关 键 词： | 细根 N内循环 根序 水曲柳 |
Nitrogen Retranslocation from the First Four Order of Fine Root Branch of Fraxinus mandshurica |
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| Institution: | Huang Shizhu, Zhang Yandong, Wang Zhengquan, Sun Xiaoxin (1. Heilongjiang Vocational Institute of Ecological Engineering, Harbin 150025; 2. School of Forestry, Northeast Forestry University, Harbin 150040) |
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| Abstract: | In this study, the nitrogen contents differences between live and dead roots were compared to study nitrogen retranslo- cation in the branch order fine roots of a Manchurian Ash （ Fraxinus mandshurica ） plantation located in the mountains of northeastern Heilongjiang Province. The results showed that： there was no nitrogen retranslocation from the first-order and the second-order roots, but there were nitrogen retranslocations from the third-order and the fourth-order roots, and nitrogen retranslocation efficiencys were 26. 03% and 50. 93% , respectively. These results illustrated that roots branch order may be an important indication of nitrogen retranslocation in dead fine roots. |
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| Keywords: | fine root nitrogen retranslocation roots branch order Fraxinus mandshurica |
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