模拟增温对松嫩草地羊草有性生殖策略影响的研究  

Effects of simulated warming on sexual reproduction strategy of Leymus chinensis in Songnen grassland

作　　者：高嵩 王俊锋[2] 郭继勋[2] 穆春生[2] GAO Song;WANG Jun-feng;GUO Ji-xun;MU Chun-sheng(School of Landscape,Changchun University,Changchun 130022,China;Institute of Grassland Science,Key Laboratory of Vegetation Ecology of the Ministry of Education,Northeast Normal University,Changchun 130024,China)

机构地区：[1]长春大学园林学院,吉林长春130022 [2]东北师范大学草地科学研究所,植被生态科学教育部重点实验室,吉林长春130024

出　　处：《东北师大学报（自然科学版）》2021年第4期98-105,共8页Journal of Northeast Normal University(Natural Science Edition)

基　　金：吉林省自然科学基金资助项目(20200201201JC);吉林省教育厅“十三五”科学技术项目(JJKH20200581KJ).

摘　　要：通过连续3年的模拟增温实验,探讨了东北松嫩草甸草原单优种羊草的有性生殖策略对大气温度增加的响应.结果表明:增温使羊草物候期从抽穗期开始比对照提前,尤其是从第一花粉囊外露之后到果实成熟期,物候期均比对照明显提前5~7 d.增温降低了单位面积的生殖枝数量,但使生殖枝单株重量、每穗小花数、结实粒数、籽粒重量都显著增加.种群水平上,用于有性生殖的总能量减少,但单株水平上,用于籽粒发育的能量增加.羊草这一多年生根茎型禾草在大气温度升高的条件下会采取减少生殖枝数量而增加生殖枝结实能力的繁殖策略,说明类似于羊草的多年生根茎型禾草在温度变化的条件下生殖策略会发生较大改变,多年的持续增温可能导致种子产量的持续降低.Understanding how the sexual reproductive of perennial grass responds to global warming is crucial for predicting plant community development in grasslands.This papers studied the effects of a three-year field warming on sexual reproductive strategy of Leymus chinensis in the Songnen meadow steppe of Northeast China from 2006 to 2008.The results showed that warming treatment had an obvious effect on reproductive phenology,advancing it by 5~7 d compared with controls,especially during the time from the first pollen sac appearance to seed maturation.Also,the significant positive responses to warming in terms of flowering plant weight,floret number,seed number and seed weight per plant,and negative responses in flowering plant number per unit area were found.The energy allocated to sexual reproduction was reduced in population level.Whereas,the energy allocated to seed development was increased.The results suggested that the reproductive strategy of rhizomatous perennial grass like L.chinensis will be changed a lot in response to global warming.Sexual reproductive ability may decrease due to reductions in seed yield that result from the long-term effects of climate change.

关 键 词：羊草 增温 生殖物候期 种子生产 生殖分配 

分 类 号：S812.29[农业科学—草业科学]