内蒙古图牧吉自然保护区羊草种群营养繁殖特性的比较  

Vegetative reproduction characteristics of Leymus chinensis populations in Tumuji National Nature Reserve,Inner Mongolia

作　　者：李海燕[1] 李建东[1] 徐振国 周景英 张建峰 

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：《草业学报》2011年第5期19-25,共7页Acta Prataculturae Sinica

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

摘　　要：在内蒙古图牧吉国家级自然保护区内,对草甸和草甸草原上灰绿型和黄绿型2个生态型羊草种群营养繁殖的诸数量特征进行了比较研究。结果表明,在2种植被类型中,灰绿型和黄绿型羊草分蘖株的数量和生物量均由4个龄级组成,且均以4a所占比重最小,呈稳定型或增长型龄级结构;根茎均以2a所占比重最大,呈稳定型龄级结构;2个生态型羊草的单株生产力均以1a分蘖株最高,且均随着龄级的增加依次减少;在整体水平上,草甸草原上灰绿型和黄绿型羊草的单株生产力均显著高于草甸;2个生态型羊草的根茎生产力均以1或2a最高。在温带草本群落,增长型或稳定型的年龄结构、年轻龄级分蘖株和根茎旺盛的物质生产和贮存能力,是多年生无性系草本植物实现其持续繁荣的主要原因。Quantitative features of vegetative reproduction of grey-green and yellow-green Leymus chinensis on meadow and meadow steppe were studied in Tumuji National Nature Reserve,Inner Mongolia.In two vegetation types,the number and biomass of two ecotype L.chinensis tillers consisted of four age classes of which the 4-year tillers were the fewest.The tillers were stable or expansive age structures.The 2-year rhizomes were dominant,and were stable age structures.The productivity per tiller of 1-year tillers of the two ecotypes was the highest and the productivity gradually decreased with increasing age classes.The productivity per tiller on meadow steppe was significantly higher than those of meadow grey-green and yellow-green ecotypes.The 1-year or 2-year rhizome productivity of the two ecotypes was the highest.In temperate herbaceous communities,increased or stable age structures,vigorous matter production and storage of both young tillers and rhizomes were essential reasons for sustaining flourishing perennial clonal plants.

关 键 词：草甸 草甸草原 羊草 灰绿型 黄绿型 营养繁殖 

分 类 号：S543.9[农业科学—作物学] Q948.158[生物学—植物学]