| 梯田生物埂几种灌木根系的垂直分布特征 |
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| 引用本文： | 张宇清,朱清科,齐实,张岩. 梯田生物埂几种灌木根系的垂直分布特征[J]. 北京林业大学学报, 2006, 28(2): 34-38 |
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| 作者姓名： | 张宇清 朱清科 齐实 张岩 |
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| 作者单位： | 北京师范大学地理学与遥感科学学院水土保持与荒漠化防治教育部重点实验室;北京林业大学水土保持学院;水土保持与荒漠化防治教育部重点实验室;北京林业大学水土保持学院 |
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| 摘 要： | 林木活性根的分布特征在农林复合系统树种选择、最佳株行距的确定、调控措施的确定等方面具有重要意义. 该文运用整株挖掘法对梯田生物埂几种灌木根系的垂直分布特征进行了研究. 结果表明，多枝柽柳、杞柳、柠条的根系生物量和根长随深度均呈指数减少；根系消弱系数反映出的根系分布特点，与根系的实际分布情况相符，可以作为描述3种灌木根系垂直变化的参数. 根据3种灌木的根系分布特点，研究建议，多枝柽柳和柠条可以作为梯田埂坎立地上栽植的农林复合树种，杞柳可栽植在水分条件较好的阴坡；3种灌木均应栽植在梯田埂坎虚土和原状土结合处；杞柳还应采取平茬和与秋粮作物配置的竞争调控措施.
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| 关 键 词： | 梯田埂坎 根系 多枝柽柳 杞柳 柠条 根系消弱系数 细根 |
| 文章编号： | 1000-1522（2006）02-0034-05 |
| 收稿时间： | 2005-03-09 |
| 修稿时间： | 2005-03-09 |
Vertical distribution characteristics of root system of several shrub species on terrace banks |
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| ZHANG Yu-qing,ZHU Qing-ke,QI Shi,ZHANG Yan. Vertical distribution characteristics of root system of several shrub species on terrace banks[J]. Journal of Beijing Forestry University, 2006, 28(2): 34-38 |
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| Authors: | ZHANG Yu-qing ZHU Qing-ke QI Shi ZHANG Yan |
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| Affiliation: | 1 College of Geography and Remote Sensing Sciences, Beijing Normal University, 100875, P. R. China; 2 Key Laboratory of Soil and Water Conservation and Desertifieation Combating, Ministry of Education, College of Water and Soil Conservation, Beijing Forestry University, 100083, P. R. China. |
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| Abstract: | The distribution characteristics of active roots of woody plants are significant for the selection of tree species, spacing decision and management measures for agroforestry system. The authors investigated the vertical distribution characteristics of roots of several shrub species on terrace banks using whole plant excavation. The results show that root length and root biomass of Tamarix ranmsissima, Salix integra and Caragana korshinskii decline exponentially with soil depth; a root extinction coefficient could be used as a parameter revealing the vertical distribution characteristics of shrubs planted on terrace banks. The results suggest that T. ranmsissima and C. korshinskii should be selected as shrub species for agroforestry system on terrace banks in the arid Loess Plateau; S. integra should be planted on shady slopes with better soil moisture, pruned timely and matched with crops in the autumn; these three shrub species should be planted on transition positions from loose layers to consolidated ones to alleviate competition and ensure their growth. |
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| Keywords: | terrace bank root system Tamarix ramosissima Salix integra Caragana korshinskii root extinction coefficient fine root |
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