文档介绍:
光照强度和种子大小对豆科植物萌发及建
植的影响#
李雄,秦雪雪,张春辉,杜国祯**
5
(兰州大学生命科学学院,兰州
730000)
摘要:本研究以青藏高原东缘 16 种豆科(Leguminosae)植物的种子为研究对象,探索光照
强度和种子大小与豆科植物萌发、存活及最终建植之间的关系。本实验这些结果将会给我国
牧区草原的保护以及某些地区草原退化的恢复提供一定的参考材料。在四种不同光照梯度下
10
15
20
(100%NS、67%NS、35%NS、4%NS)对种子的萌发率、存活率、建植率进行统计。研究
发现:整体上,本实验中豆科植物种子的萌发率较低(平均值小于 20%),存活率较高(大
于 70%),建植率也较低(小于 15%)。光照对本实验豆科植物种子的萌发影响呈现出促
进、抑制、无显著影响 3 种情况:其中,甘肃棘豆(Oxytropis kansuensis)、斜茎黄耆(Astragalus
adsurgens)等 6 种植物,光照对它们的萌发有促进作用;而光照对救荒野豌豆(Vicia sativa
linn)的萌发有抑制作用;歪头菜(Vicia unijuga)、草木犀(Melilotus officinalis)等 9 种
豆科植物,光照对其萌发没有显著性影响。在整体上,豆科植物的平均萌发率 100NS%与其
它 3 种光照条件相比有显著增加;与其它光照条件相比极低光照条件下(4%NS)豆科植物
平均存活率表现出显著下降,而平均建植率随光照强度的增加显著增加。本实验中,种子大
小与出苗率以及建植率的线性关系有着光照依赖性,只有在极低光照下(4%),种子大小
才会成为影响本实验中豆科种子萌发的和建植的限制因子,而种子大小不是决定存活率的关
键因素。
关键词:生态学;光照强度;种子大小;萌发率;存活率;建植率
中图分类号:Q14
25
Effects of light and seed size on seedling emergence rate and
establishment rate of 16 mon species from
the eastern Qinghai-Tibetan Plateau
Li Xiong, Qin Xuexue, Zhang Chunhui, Du Guozhen
30
35
40
(School of Life Sciences,Lanzhou University,730000)
Abstract: In this study,we used mon species of leguminous seeds from the eastern
Qinghai-Tibetan Plateau as the research object to statistics seedling emergence rate, survival rate
and establishment rate under four different illumination result of this experiment
showed that, on the whole, the seed germination rate and planting rate are lower, but the survival
rate is higher. The effects of light on the germination of legume can be divided into the promotion,
inhibition and no significant three categories. Light intensity promote their germination such as
Oxytropis kansuensis, Astragalus adsurgens. Light intensity inhibit the germination of Vicia
sativa . But Vicia unijuga, Melilotus officinalis, light intensity have't significant effect. On the
whole, compared to ther illumination conditions, Leguminous species survivall showed a
significant decline in the minimum illumination. But the pla