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单立山,李,毅,段桂芳,张正中,张,荣,段雅楠.人工模拟降雨格局变化对红砂种子萌发的影响.生态学报,2017,(16).http://dx.doi.org/10.5846/stxb201605271024  
人工模拟降雨格局变化对红砂种子萌发的影响
Effects of simulated precipitation change on seed germination of Reaumuria soongorica
投稿时间:2016-05-27  修订日期:2017-03-03
DOI: 10.5846/stxb201605271024
关键词降雨间隔时间  降雨量  种子萌发  幼苗更新
Key Wordsprecipitation interval  precipitation quantity  seed germination  seedling regeneration
基金项目国家自然科学基金(41361100,31560135,31360205,41461044),甘肃省科技支撑项目(1604FKCA088),甘肃省高等学校科研项目 (2015A⁃067);甘肃农业大学青年研究生指导教师扶持基金(GAU⁃QNDS⁃201605)
作者单位E-mail
单立山 甘肃农业大学林学院 shanls@gsau.edu.cn 
 甘肃农业大学林学院  
 甘肃农业大学林学院  
段桂芳 甘肃农业大学林学院  
张正中 甘肃农业大学林学院  
 甘肃农业大学林学院  
 甘肃农业大学林学院  
段雅楠 甘肃农业大学林学院  
摘要点击次数 158
全文下载次数 28
摘要:
气候变化改变降雨格局,会影响到种子出苗及幼苗生长,进而影响幼苗的更新动态。为探讨降雨格局变化对典型荒漠植物红砂种子萌发特性的影响,本研究利用环境控制生长箱开展了降雨量和降雨间隔时间的双因素控制实验。结果表明:(1)总降雨量增加30%,红砂种子发芽率和发芽势分别平均提高45.69%、39.86% (p < 0.05),延长降雨间隔时间单次降雨量达到5.46mm其效果更明显,发芽率和发芽势达到最大值,分别为68.33%、63.33%。(2)总降雨量增加30%显著提高了种子萌发指数和活力指数(p < 0.05),与自然总降雨量相比,分别平均提高57.67%、121%。总降雨量减少30%虽降低了萌发指数和活力指数,但与自然总降雨量相比差异不显著(p > 0.05)。(3)降雨量增加30%延长降雨间隔时间处理加快了红砂的萌发进程,缩短了种子的萌发持续时间,其萌发曲线较陡峭。降雨量减少30%对其种子萌发进程影响不大。该研究得到以下主要结论:1)红砂种子萌发主要受到降雨量的影响,但降雨量效应依赖降雨间隔时间,总降雨量一定降水间隔延长所形成的单次降雨量增加均提高萌发率,增加了红砂繁殖成功率,对其幼苗更新起促进效应;2)在自然状态及降雨减少的情况下红砂种子具有推迟萌发的特性,使其幼苗在更适宜的环境条件下出现和生长的机会增多,从而提高植物对环境的长期适应性。
Abstract:
eed germination was considered to be the most important and sensitive to the change of moisture and heat phases in the process of plants natural regeneration. The northwest arid areas is one of the drought areas most sensitive to precipitation change in China, and Reaumuria soongorica, a super-xerophytic shrub, exhibits a strong tolerance for drought, cold, saline-alkali soil, and barren landscapes and is a long-lived species. Our objective was to investigate how precipitation change affects the physiological and ecological processes of seeds of R. soongorica to determine the regeneration mechanisms and change in patterns of this key species. Seeds of R. soongorica were collected in fall of 2013 at the Linze Inland River Basin Research Station Research Station in the Chinese Academy of Sciences. We set up a growth-chamber experiment with two factors: precipitation quantity (natural precipitation as control, reduction of 30% and increase of 30%) and interval (defined as the time elapsed between two precipitation events) (5 and 10 days). Germinated seeds were counted daily until the end of germination. The results showed that: Increasing precipitation ( 30%) resulted in significantly enhanced germination rate and germination potential by an average of 45.69% and 39.86%, respectively, especially extending the precipitation interval from 5 to 15 days(A single rainfall reach to 5.46mm), germination rate and germination potential were reach to maximum by an average of 68.33% and 63.33%, respectively. Germination index and vigor index were significantly increased by an average of 57.67% and 121% (p < 0.05) by increased precipitation quantity ( 30%). Extended precipitation interval under Increasing precipitation ( 30%) resulted in reduced germination index and vigor index, but it is not significantly effect. Increasing precipitation ( 30%) under extended precipitation interval treatments accelerated the course of germination, and the germination periods were shorter. Reducing precipitation by 30% had no significant effects on the course of germination. Therefore, the seed germination was mainly affected by precipitation quantity, but the effect was rely on precipitation interval, the seed germination percentage was increased under the precipitation pattern which was increasing precipitation ( 30%) under extended precipitation interval, then the breeding success rate and the seedling establishment ability were enhanced, and seedling regeneration were promoted. R.soongorica has the characteristics of delayed germination under CK and reducing precipitation, which increased the seedling emergence and growth of the seedlings under more favorable environmental conditions and improve the long-term adaptability of plants to the environment.
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