期刊文献+

光照对陕北退耕地主要植物种子萌发的影响 预览

Effects of light on the germination of dominate plant seeds in an abandoned cropland in northern Shaanxi
在线阅读HTML 下载PDF
收藏 分享 导出
摘要 种子萌发过程中对光的感应能够保障种子在合适的条件萌发、出苗,因而光照的有无会对某些物种种子萌发产生影响。本研究以陕北黄土丘陵沟壑区退耕区10种主要植物种子作为研究对象,通过室内萌发法,在全光照与全黑暗两种条件下对种子萌发特征进行分析。结果表明,10种典型植物大部分种子萌发迅速,光照条件下在4d内有7种植物种子萌发达到T50(萌发种子数达最终发芽种子总数的50%),达到T50所用时间最长的也只需9d;试验物种中有7种光照条件下达T90所用时间较少,且光照条件下不同物种的发芽指数差异显著(P<0.05);光照条件下种子萌发率显著大于黑暗条件下的有香青兰(Dracocephalum moldavica)、铁杆蒿(Artemisia sacrorum)、益母草(Leonurus artemisia)、菊叶委陵菜(Potentilla tanacetifolia)和败酱(Patrinia scabiosaefolia)。只有狗尾草(Setaria viridis)萌发率在黑暗条件下显著大于光照条件。其余植物种子萌发率在两种条件下差异不显著(P>0.05)。综上所述,光照是影响陕北退耕地植物种子萌发的重要因素,黑暗对研究中多数物种种子萌发具有抑制作用。因而,侵蚀淤埋遮光是植物更新的潜在限制因素。 During seed germination,the light sensitivity of seeds can guarantee germination and emergence of seedlings under appropriate conditions.Therefore,the presence or absence of light can affect seed germination of certain species.In this study,10 dominate plant seeds from an abandoned cropland in northern Shaanxi were chosen as research material.Seed germination characteristics were observed under both full-light and full-darkness conditions.The results showed that most of the 10 dominate plants germinated quickly.Under light conditions,the germination of seeds of 7 species reached T50(time at which the number of germinated seeds reaches 50% of the total number of germinated seeds)within 4 days(d),and the minimum T50 was 9 d.Among all the experimental species,there were 7 species that achieved T90 in a shorter time under light conditions.Additionally,the seed germination index of different species under light conditions was significantly different.The seeds of species,including Dracocephalum moldavica,Artemisia sacrorum,Leonurus artemisia,Potentilla tanacetifolia,and Patrinia scabiosaefolia had a significantly higher germination percentage under light conditions than that under dark conditions.Only the germination percentage of Setaria viridis was significantly greater in darkness than in light.The germination percentage of seeds of other plants was not significantly different between the two conditions studied.The above results show that light is an important factor affecting plant seed germination on the abandoned cropland in the study region and darkness had an inhibitory effect on seed germination in most species.Thus,during the soil erosion process,sediment silting and shading are potential limiting factors for plant regeneration.
作者 赵富王 王宁 葛芳红 ZHAO Fuwang;WANG Ning;GE Fanghong(College of Tourism and Environment Shaanxi Normal University/National Experimental Teaching Demonstration Center of Geography Science,Shaanxi Normal University,Xi’an 710119,Shaanxi,China)
出处 《草业科学》 CAS CSCD 2019年第5期1353-1360,共8页 Pratacultural Science
基金 国家自然科学基金(41501290、41571260) 陕西省自然科学基金(2017JM4021)。
关键词 陕北退耕地 光照 种子萌发 发芽率 abandoned croplands in northern Shaanxi light seed germination germination percentage
作者简介 第一作者:赵富王(1993-),男,云南砚山人,在读硕士生,主要从事水土保持与生态恢复研究。E-mail:Zfwdky@163.com;通信作者:王宁(1982-),男,河北保定人,副教授,博士,主要从事水土保持与植被恢复相关研究。E-mail:nwang123456@snnu.edu.cn.
  • 相关文献

参考文献23

二级参考文献537

共引文献549

投稿分析

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈
新型冠状病毒肺炎防控与诊疗专栏