| 青藏高原高寒草甸种子萌发行为沿海拔梯度的分异特征 |
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| 引用本文： | 许静,李文龙,吴鑫悦,罗佳宁,廖元成. 青藏高原高寒草甸种子萌发行为沿海拔梯度的分异特征[J]. 草地学报, 2021, 29(z1): 10-18. DOI: 10.11733/j.issn.1007-0435.2021.Z1.002 |
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| 作者姓名： | 许静 李文龙 吴鑫悦 罗佳宁 廖元成 |
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| 作者单位： | 1. 兰州财经大学农林经济管理学院, 甘肃 兰州 730101;2. 兰州大学草地农业科技学院, 甘肃 兰州 730020;3. 兰州财经大学经济学院, 甘肃 兰州 730101 |
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| 基金项目： | 甘肃省软科学专项（20CX9ZA060）;甘肃省高等学校创新能力提升项目（2020A-063）;兰州财经大学高等教育教学改革研究重点项目（2020-02）;现代农业产业技术体系建设专项资金（CARS-34）;中科院西北高原生物研究所青海省寒区恢复生态学重点实验室开放课题（2020-KF-09）资助 |
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| 摘 要： | 为探究海拔梯度上高寒草甸植物种子萌发行为的分异特征及温度对不同海拔种群萌发行为的影响,本研究选取青藏高原东缘高寒草甸为研究区,选用31种常见植物种,沿海拔梯度共采集79个种群的种子,设置昼夜温度15℃/5℃和25℃/10℃开展萌发试验,探讨高寒草甸植物种子萌发行为与海拔的关系。研究结果表明：温度对种子萌发行为影响显著,25℃/10℃比15℃/5℃处理下的半数萌发时间（The time to achieve 50% germination,T50）缩短7.20 d,萌发率（Germination percentage,GP）增加12.83%。萌发行为与海拔间的关系与萌发温度有关,15℃/5℃处理下,海拔对T50的影响不显著,GP随海拔的升高显著增加;但在25℃/10℃处理下,T50随海拔升高而显著延长,GP随海拔升高显著下降。温度升高时,部分高海拔种群中的种子倾向选择延迟萌发。延迟萌发对策能够促进有限的环境资源在时间和空间尺度上分化,有利于避免不可预测环境下大量同步萌发所面临的灭绝风险,对物种更新和续存起到重要作用。
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| 关 键 词： | 种子萌发 海拔 温度 高寒草甸 |
| 收稿时间： | 2021-04-08 |
Differentiation of Seed Germination Behavior in Alpine Meadow on the Tibetan Plateau along the Elevation Gradient |
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| XU Jing,LI Wen-long,WU Xin-yue,LUO Jia-ning,LIAO Yuan-cheng. Differentiation of Seed Germination Behavior in Alpine Meadow on the Tibetan Plateau along the Elevation Gradient[J]. Acta Agrestia Sinica, 2021, 29(z1): 10-18. DOI: 10.11733/j.issn.1007-0435.2021.Z1.002 |
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| Authors: | XU Jing LI Wen-long WU Xin-yue LUO Jia-ning LIAO Yuan-cheng |
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| Affiliation: | 1. School of Agricultural and Forestry Economics and Management, Lanzhou University of Finance and Economics, Lanzhou, Gansu Province 730101, China;2. School of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu Province 730020, China;3. School of Economics, Lanzhou University of Finance and Economics, Lanzhou, Gansu Province 730101, China |
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| Abstract: | To investigate the different characteristics of seed germination behavior of alpine meadow plants along the elevation gradient and the effects of temperature on germination behaviors of populations at different elevations, we chose 31 common species from an alpine meadow on the eastern edge of Tibetan Plateau, and collected seeds of 79 populations along the altitude gradient. We set 15℃/5℃ and 25℃/10℃ temperature treatments to carry out germination experiments and discussed the relationship between germination behavior and elevation. The results showed that temperature affected germination behaviors significantly. Compared with 15℃/5℃ treatment, T50 was shortened by 7.20 d, and GP increased by 12.83% under 25℃/10℃ treatment. The relationship between germination behavior and elevation was also related to germination temperature. There was no significant correlation between T50 and elevation under 15℃/5℃ treatment, but GP significantly increased with the elevation under 15℃/5℃. However, T50 increased with elevation and GP decreased with elevation significantly under 25℃/10℃ treatment. When the temperature rises, some seeds in high-elevation populations tended to delay germination. Delayed germination strategies can promote the differentiation of limited environmental resources on time and space scales, help avoid the risk of extinction faced by large numbers of simultaneous germination in unpredictable environments, and play an important role in species renewal and survival. |
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| Keywords: | Seed germination Elevation Temperature Alpine meadow |
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