| 乌兰布和沙区紫花苜蓿根系生长及吸水规律的研究 |
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| 引用本文： | 白文明,左强,黄元仿,李保国.乌兰布和沙区紫花苜蓿根系生长及吸水规律的研究[J].植物生态学报,2001,25(1):35-41. |
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| 作者姓名： | 白文明 左强 黄元仿 李保国 |
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| 作者单位： | 1. 中国科学院植物研究所
2. 中国农业大学资环学院土壤和水科学系, |
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| 基金项目： | 国家重点基础研究发展规划项目（1999011709）和国家自然科学重大基金（89990490） |
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| 摘 要： | 研究了不同水分处理下，乌兰布和沙区紫花苜蓿系生长发育规律及根系吸水速度，结果表明：不同水分处理的根系生长规律最基本一致的，在生长季风均呈增加的趋势；但适度干旱可促进根系的伸长生长。在当地土壤类型条件下，根系主要分布在０－３０cm土层；根重密度在土壤剖面上的分布遵循对数规律，并随深度的增加呈降低趋势。运用一维土壤水分运动方程，计算得到了不同水分处理根系吸水速度在土壤剖面上的分布状况；根系吸水速率与土壤含水量和根密度密切相关。
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| 关 键 词： | 乌兰布和沙区 紫花苜蓿 根系生长 根系吸 |
| 修稿时间： | 2000年4月4日 |
EFFECT OF WATER SUPPLY ON
ROOT GROWTH AND WATER UPTAKE OF ALFALFA IN WULANBUHE SANDY REGION |
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| BAI Wen-Ming,ZUO Qiang,HUANG Yuan-fang,LI Bao-Guo.EFFECT OF WATER SUPPLY ON
ROOT GROWTH AND WATER UPTAKE OF ALFALFA IN WULANBUHE SANDY REGION[J].Acta Phytoecologica Sinica,2001,25(1):35-41. |
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| Authors: | BAI Wen-Ming ZUO Qiang HUANG Yuan-fang LI Bao-Guo |
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| Abstract: | A field study was conducted in Wulanbuhe sandy region to determine the effect of water supply on roots growth and water uptake of alfalfa ( Medicago sativa L.). 3 treatments with different irrigation methods and watering frequency were arranged. One treatment received 133 mm in 3 flooding applications (W1 and W3), the second received 103 mm from a sprinkler application (W1 and W2). The final treatment was 33 mm from a sprinkler (W3). An increasing tendency of roots growth was observed in all the 3 treatments. However there was a between treatment difference in rooting depth: moderate drought stimulated root elongation. Local roots of alfalfa mainly developed in the top 30 cm of soil and their number decreased greatly with depth. In this paper a logarithmic function was introduced to describe the root weight density distribution in the soil profile and 3 regression equations representing root density were established for the 3 treatments respectively. Finally, root water uptake rates at different growth stages of alfalfa in each treatment were simulated by applying of the theory of soil water dynamics. |
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| Keywords: | Wulanbuhe sandy region Medicago sativa Root growth Water uptake |
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