摘要
采用室内和田间试验,研究了巴山榧树3个地理种群种子形态特征、种子萌发特性及幼苗生长规律。结果表明,巴山榧树种子形态特征在种群内和种群间均存在一定程度的变异,重庆南川种群种子变异较大,甘肃武都种群相对较小;3个种群种子大小顺序表现为,甘肃武都>四川万源>重庆南川,长度、宽度和重量在种群间差异显著或极显著,长宽比在重庆南川种群和甘肃武都种群间差异显著,重庆南川种群种子在形状上趋向椭圆形,甘肃武都种群种子则更趋圆球形。巴山榧树种子具有休眠现象,萌发率较低;1年生幼苗苗高呈"S"型曲线增长;3个种群种子萌发率、幼苗苗高与种子大小顺序表现一致,种子大小对种子萌发和幼苗生长有明显影响。应加强巴山榧树的保护和繁育。
Based on the indoor and field experiments on three geographical populations of Torreyafargesii,the morphological characteristics of seeds,germination characteristics and seedling growth law are analyzed.The results indicate that a）to a certain extent,there is variability on seed morphological characteristics within every population and among populations,Chongqing Nanchuan＇s population variation is larger,but Gansu Wudu＇s 〉relatively smaller.b）The seed size of three populations varies gradually,and the sequence is,Gansu Wudu＇sSichuan Wanyuan＇s〉Chongqing Nanchuan＇s.There are significant or very significant differences in the length,the width and the weight of the seed between the populations.There is significant difference in the length-width ratio between the Chongqing Nanchuan＇s population and the Gansu Wudu＇s population.The seed shape of Chongqing Nanchuan＇s population trends elliptical,yet the Gansu Wudu＇s spherical.c）On the seed of T.fargesii,there are following characteristics,dormancy phenomenon,low germination rate,＂S＂type growth curve on the height of annual seedling.The seed germination rate and the seedling height of the 3populations are consistent with the sequence of seed size,and the seed size has a significant effect on the seed germination and the seedling growth.So we can strengthen the protection and breeding of T.fargesii.
出处
《种子》
北大核心
2016年第10期14-18,共5页
Seed
基金
国家自然科学基金项目(编号:31470568)
重庆市自然科学基金项目(编号:cstc 2012jjA 00006)
长江师范学院科研创新团队建设计划资助项目(编号:2014XJTD 06)
关键词
巴山榧树
种子特性
育苗试验
种子萌发
幼苗生长
Torreyafargesii
seed characteristics
seedling raising trials
seed germination
seedling growth
