|
|||||
|
|
| 沙生针茅种子萌发特性及其影响因素 | |
| 引用本文： | 李发明,张莹花,王飞,朱淑娟,刘克彪,刘淑娟,王理德. 沙生针茅种子萌发特性及其影响因素[J]. 草原与草坪, 2015, 0(3). DOI: 10.3969/j.issn.1009-5500.2015.03.004 |
| 作者姓名： | 李发明 张莹花 王飞 朱淑娟 刘克彪 刘淑娟 王理德 |
| 作者单位： | 1. 甘肃省治沙研究所/甘肃民勤荒漠草地生态系统国家野外科学观测研究站/甘肃省治沙研究所/甘肃省荒漠化防治重点实验室/甘肃省荒漠化与风沙灾害防治国家重点实验室培育基地,甘肃 武威,733000;2. 甘肃农业大学 林学院,甘肃 兰州,730070 |
| 基金项目： | 国家地区基金项目“荒漠区沙生针茅种子萌发机理研究”，国家地区基金项目“石羊河尾闾(青土湖)水面形成的生态效应研究”，省自然基金项目“民勤荒漠草甸区芦苇种群的演替与恢复研究”，国际科技合作与交流专项“中国-联合国合作非洲水行动-非洲荒漠化国家防治沙漠化技术合作与沙产业开发”，“中国-联合国合作非洲水行动-非洲干旱地区干旱预警机制及适应性技术合作(2010DFA92860)”，甘肃省攻关计划项目 |
| 摘 要： | 利用控制试验研究了不同温度蒸馏水水分、盐分胁迫等生态因子对沙生针茅种子萌发的影响,探索了沙生针茅种子对各种生态因子的适应性。结果表明:(1)蒸馏水浸泡种子,以60℃温水浸泡、自然降温至常温12h最好;(2)低温处理与未经低温处理的种子发芽率差异不显著(P0.05),说明沙生针茅种子不存在生理后熟因素影响;(3)随着PEG-6000浓度的增加,沙生针茅种子的发芽率、发芽势、发芽指数呈下降趋势,种子发芽率的PEG-6000浓度的临界值和极限值分别为15.9%和26.3%;(4)沙生针茅种子的发芽率、发芽势、发芽指数随着盐分浓度的增加呈下降趋势,其中Na2CO3处理下的沙生针茅种子萌发率下降幅度明显大于NaCl,表明沙生针茅种子对相同质量浓度的Na2CO3的耐受能力显著低于对NaCl的耐受能力。 |
| 关 键 词： | 沙生针茅 低温变温处理 水分胁迫 盐胁迫 发芽率 发芽势 |
The characteristic of seed germination of Stipa glareosa and its influencing factors |
|
| Abstract: | The effects of temperature,water and salt stresses on seed germination of Stipa glareosa were studied and its adaptation to different ecological factors was discussed as well.The results showed that:(1)the seed germination rate in treatment of soaking with stilled water at 60 ℃ and naturally cooling to room tempera-ture(20 ℃)for 12 hours was the highest;(2)low temperature treatment did not show significant impact(P >0.05),and this suggested that the after-ripening effect does not exist;3)with the increase of the concentration of PEG-6000,the germination rate and germination index showed a decreasing trend.The threshold and limit value of PEG-6000 concentration were 15.9% and 26.3% respectively;4)the seed germination rate and germi-nation index decreased with the increasing salt concentration,in which,the decline range caused by Na2 CO3 was significantly greater than NaCl. |
| Keywords: | Stipa glareosa variable cryogenic treatment water stress salt stress germination rate germina-tion potential |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |