摘要
为明晰冬季层积对高寒草甸植物种子萌发的影响,以同期收获的室内贮藏种子为对照,对甘肃天祝高寒草甸土中、藏羊粪和牦牛粪中冬季层积的5种高寒草甸植物种子萌发特性进行了研究。结果表明,层积对矮生嵩草(Kobresia humilis)、华扁穗草(Blysmus sinocompressus)、细叶鸢尾(Iris tenuifolia)、无脉苔草(Carex enervis)和线叶嵩草(K.capillifolia)种子发芽率、初始发芽天数和发芽指数的影响因种皮的完整性、层积基质和草种不同而异。和对照相比,冬季层积提高了破皮的矮生嵩草、华扁穗草、细叶鸢尾和无脉苔草种子的发芽率和发芽指数,降低了其初始发芽天数。冬季层积对完整种子萌发的影响小于破皮种子。牦牛粪中层积的破皮华扁穗草种子发芽率显著高于在绵羊粪和土中层积的种子(P<0.05),而破皮的矮生嵩草、细叶鸢尾、无脉苔草种子在各层积基质处理间无显著差异(P>0.05)。冬季层积对完整及破皮线叶嵩草种子的萌发无显著影响。
In order to clarify the effects of the winter stratification on seed germination of alpine meadow plants,we studied the seed germination characteristics of 5 kinds of alpine meadow plants which were stratificated in Tianzhu alpine meadow soil,Tibetan sheep dung and yak dung,respectively,with the seeds stored indoor as the control.The results showed that the stratification influenced the germination percentage,initial germination days and germination index of Kobresia humilis,Blysmus sinocompressus,Iris tenuifolia,Carex enervis and K.capillifolia seeds which varied with the integrity of the seed coat,stratification matrix and grass species.Compared with the control,the winter stratification improved the scarified seed germination percentage and the germination index and reduced initial germination days of K.humilis,B.sinocompressus,I.tenuifolia,C.enervis and K.capillifolia.The influence of winter stratification on the seed germination of complete seed was lower than that on the scarified seed.The germination percentage of the scarified seed of B.sinocompressus stratificated in yak dung was significantly higher( P < 0.05) than that in the Tibetan sheep dung and soil treatment.For the germination of the scarified seeds of K.humilis,I.tenuifolia and C.enervis,there was no significant difference between the different treatments of stratification matrix.There was no significant effect of winter stratification on the germination of the complete and the scarified seed of K.capillifolia.
出处
《草业科学》
CAS
CSCD
北大核心
2015年第3期427-432,共6页
Pratacultural Science
基金
国家自然科学基金青年项目(31001029)
关键词
层积
初始发芽天数
高寒草甸
种子
发芽率
stratification
initial germination days
alpine meadow
seed
germination percentage
