内蒙古锡林郭勒草原贝加尔针茅的繁殖特性及其生态响应  

Ecological response of reproductive performance of Stipa baicalensis in Xilingol steppe of Inner Mongolia

作　　者：张勃[1] 陈海军[2] 侯向阳[2] 方强恩[1] 姜杰[1] 裴晨玲 许冬梅[1] 纪磊[2] 运向军[2] 韩文军[2] 

机构地区：[1]甘肃农业大学草业学院,草业生态系统教育部重点实验室,甘肃兰州730070 [2]中国农业科学院草原研究所,内蒙古呼和浩特010010

出　　处：《甘肃农业大学学报》2015年第4期103-108,共6页Journal of Gansu Agricultural University

基　　金：国家国际科技合作专项(2013DFR30760);甘肃农业大学盛彤笙科技创新基金(GSAU-STS-1331);国家自然科学基金(41461014)

摘　　要：植物的繁殖阶段对环境变化最为敏感,其生活史繁殖特性随地理和气候因子改变将发生适应性生态响应.研究调查了内蒙古锡林郭勒草原不同纬度带贝加尔针茅的生长和繁殖特性.结果表明:随纬度增大,种群的株丛密度显著降低(P<0.001),丛围变大,单株生殖枝数显著增多(P=0.008);随海拔升高,种群的株丛密度显著增大(P=0.015),丛围变小,单株生殖枝数显著降低(P=0.013),种子的芒针长随之缩短(P<0.001);随年平均降雨量增大,株丛密度、丛围大小和单株生殖枝数3个性状表现出与纬度相反的响应模式;种子长和生殖枝茎高两性状对各生态因子未表现出显著的变化响应.总体表明,随地理和气候环境变化,贝加尔针茅种群表现出不同的繁殖适应策略.It has been believed that reproduction phase of plants is particularly vulnerable to environ- ment change, and thereby reproductive traits are highly prone to vary with ecological factors, reflecting plant＇s adaptation to specific habitats; Investigations into growth and reproduction of Stipa baicalenSis were conducted in Xilinguole steppe of Inner Mongolia. The results showed that with latitude increasing, plant density significantly decreased （P〈0. 001）, and basal diameter of tufted plant became smaller and the num- ber of reproductive shoots per plant notably reduced （P=0. 008）. In contrast to latitude,each of the three traits displayed opposite response to either elevated altitude or increased annual mean precipitation. In addi- tion, seed awn＇s length shortened with elevated altitude （P〈0. 001）. For both seed length and stalk height of reproductive shoot,no significant response to ecological variables was observed. It is suggested that S. baicalensis employs different reproductive strategies in response to geographical and climatic ,oariation.

关 键 词：贝加尔针茅 草原 繁殖 纬度带 海拔 降雨量 

分 类 号：Q149[生物学—生态学]