不同植被类型大油芒种群构件特征的比较研究  

Comparison of Module Characteristics of Spodiopogon sibiricus Populations in Different Vegetation Types

作　　者：李海燕[1] 杨允菲[1] 李建东[1] 李志坚[1] 周景英 徐振国 

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 [2]内蒙古图牧吉国家级自然保护区,内蒙古扎赉特旗137600

出　　处：《中国草地学报》2011年第6期35-40,共6页Chinese Journal of Grassland

基　　金：国家自然科学基金(30770397;30901049);国家科技支撑计划(2008BADB0B06-01);东北师范大学青年基金(20090501);吉林省科技厅青年基金(201101012)

摘　　要：在松嫩草地和内蒙古图牧吉国家级自然保护区内,对草甸和草甸草原上大油芒种群构件的特征进行了比较研究。结果表明,两种植被类型中,大油芒种群分蘖株的数量和生物量分别由3个和2个龄级组成,且均以1a所占比重最大,呈增长型龄级结构;根茎分别以2a和1a所占比重最大,呈稳定型和增长型;大油芒种群的单株生物量均以1a最高,且均随着龄级的增加依次减少。整体水平上,草甸草原上大油芒平均单株重显著高于草甸。草甸草原上各龄级根茎单位长度生物量均极显著高于草甸。两种植被类型中,根茎顶端芽所占比例分别为22.5%和44.1%;分蘖节芽均以1a所占比重最大,且随着龄级的增加而减少。大油芒种群在生长季末期储备了充足的芽用于翌年地上部分的更新。草甸草原上的大油芒种群具有更强的种群更新能力。Module characteristics of Spodiopogon sibiricus populations were compared In ciltterent vegetation types in Songnen grassland and Tumuji National Nature Reservation Area, Inner Mongolia. In two vegetation types, the tiller number and biomass of S. sibiricus consisted of three and two age classes, respectively, and la tillers were the most, which wereexpansive age structures. The 2a and la rhizomes were dominant, and which were stable age structures in meadow and meadow steppe. The productivity per tiller of la tillers was the highest and the productivity gradually decreased with increase of age classes. The productivity both per tiller and per age class rhizome on meadow steppe was significantly and extremely significantly higher than those on meadow. Topmost buds of rhizome were 2.5% and 44.1% of total bud banks in two vegetation types, respectively. The la tiller-node buds were dominant and these buds gradu- ally decreased with age class increase. At the end of growing season, S. sibiricus populations stored enough buds for population in the next year. S. sibiricus population regeneration on meadow steppe is much better than that on meadow.

关 键 词：草甸 草甸草原 大油芒 种群 构件特征 

分 类 号：S812[农业科学—草业科学]