| 温度对垂穗披碱草种子萌发的影响 |
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| 引用本文： | 葛庆征,张卫国,张灵菲,卫万荣.温度对垂穗披碱草种子萌发的影响[J].草业科学,2012,29(5):759-767. |
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| 作者姓名： | 葛庆征 张卫国 张灵菲 卫万荣 |
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| 作者单位： | 兰州大学草地农业科技学院,甘肃兰州,730020 |
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| 基金项目： | 国家科技支撑计划项目，甘肃省重大专项 |
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| 摘 要： | 在恒温、变温和光照3种处理因素6个梯度水平的条件下，对取自4个不同海拔高度垂穗披碱草（Elymus nutans）种子的适宜发芽条件进行了研究。结果表明，垂穗披碱草的适宜发芽温度范围为15~25 ℃；变温可显著提高种子发芽率和发芽整齐度，最佳变温组合为20 ℃/10 ℃，发芽率和发芽势分别较20 ℃恒温条件提高20.2%；垂穗披碱草种子萌发对光照条件反应不敏感；在低温条件下，低海拔种子的总体发芽能力要优于高海拔种子，而在高温条件下则表现为高海拔优于低海拔的态势，但在中等温度条件下，各海拔高度的种子间无显著差异。
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| 关 键 词： | 垂穗披碱草 种子 温度 发芽条件 |
Effects of temperature on the germination of Elymus nutans seeds |
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| GE Qing-zheng,ZHANG Wei-guo,ZHANG Ling-fei,WEI Wan-rong.Effects of temperature on the germination of Elymus nutans seeds[J].Pratacultural Science,2012,29(5):759-767. |
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| Authors: | GE Qing-zheng ZHANG Wei-guo ZHANG Ling-fei WEI Wan-rong |
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| Institution: | (College of Pastoral and Agriculture Science and Technology, Lanzhou University,Lanzhou 730020,China) |
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| Abstract: | This study was aimed at determing suitable germination conditions for Elymus nutans seeds collected from four altitudes(3 941,3 528,3 212 and 2 925 m).These seeds were germinated under different temperatures and light gradients.The results indicated that the suitable germination temperatures of E.nutans ranged from 15 ℃ to 25 ℃.Variable temperature can significantly improve germination uniformity and germination rate.The best combination of variable temperature was 20 ℃/10 ℃,in which germination rate and germination potential increased 20.2% compared with that at 20 ℃.Germination of E.nutans seeds were not sensitive to light conditions.In the lower temperature,seed germination ability from the lower altitude was superior to that from the higher altitude,while in the higher temperature,seed germination ability from the higher altitude was superior to that from the lower altitude.In the intermediate temperature,however,the seed germination performance did not show significant differences among four altitude levels. |
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| Keywords: | Eiymus nutans seeds temperature germination conditions |
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