松嫩平原不同生境羊草种群构件的年龄结构  

Age Structure of Leymus chinensis Population Modules in Different Habitats of Songnen Plain

作　　者：张嘉恒[1] 王柔懿 李海燕[1] 杨允菲[1] ZHANG Jia-heng;WANG Rou-yi;LI Hai-yan;YANG Yun-fei(Key Laboratory of Vegetation Ecology,Ministry of Education,Institute of Grassland Science,Northeast Normal University,Changchun 130024,China)

机构地区：[1]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：《中国草地学报》2020年第4期73-78,共6页Chinese Journal of Grassland

基　　金：国家重点研发计划(2016YFC0500602);国家自然科学基金(31670427,31672471);吉林省科技厅自然科学基金(20170101150JC)资助。

摘　　要：年龄结构是无性系植物种群的重要属性之一。对松嫩平原长期割草草甸、封育草甸和封育积沙草甸三种生境中羊草种群构件的年龄结构调查表明:三种生境中羊草无性系种群分株的年龄结构由3~4个龄级组成,其中,长期割草草甸和封育草甸生境为增长型年龄结构,封育积沙草甸生境为稳定型;根茎均由4个龄级组成,其中,长期割草草甸和封育积沙草甸为增长型年龄结构,封育草甸为稳定型;三种生境下,长期割草草甸的分株生产力与根茎贮藏力均比较稳定,且1a、2a、3a的分株生产力与根茎贮藏力均低于其他两个生境,封育草甸和封育积沙草甸的分株生产力均随龄级的增加而下降,但根茎贮藏力在各个龄级间无显著差异。Age structure is one of the important attributes of clonal plant population. The experiment studied the age structure of Leymus chinensis population modules in three habitats of long-term mowing meadow, enclosed meadow and enclosed sandy meadow in Songnen plain. The results showed that the age structure of clonal population ramets of L. chinensis consisted of 3~4 age classes in three habitats. Among them, the age structure of long-term mowing meadow and enclosed meadow was growth type, while that of enclosed sandy meadow was stable type. Rhizomes were composed of four age classes, among them, the age structure of long-term mowing meadow and enclosed meadow habitats was growth type, and that of enclosed sandy meadow habitats was stable type. In the three habitats, the ramet productivity and the matter rhizome storage capacity of long-term mowing meadow were relatively stable, and the annual, biennial, and triennial ramet productivity and rhizome storage capacity of long-term mowing meadows were lower than those of the other two habitats. The ramet productivity of enclosed meadow and enclosed sandy meadow decreased with the increase of age classes, but there was no significant difference among age classes in rhizome storage capacity.

关 键 词：年龄结构 生境 羊草种群 构件 

分 类 号：Q945.48[生物学—植物学]