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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.
The reproductive stage of plant is the most sensitive to environmental changes, and its reproductive life cycle characteristics will adapt to ecological and ecological changes with the change of geography and climate factors.The growth and reproduction characteristics of Stipa baicalensis in different latitudes in Xilingol Grassland of Inner Mongolia were studied.The results showed that (P <0.001), and the cluster size became larger and the number of reproductive branch per plant increased significantly (P = 0.008). With increasing altitude, the plantlet density increased significantly (P <0.001) = 0.015). The width of the cluster became smaller and the number of reproductive branches per plant decreased significantly (P = 0.013), and the length of the needles of the seeds shortened (P <0.001). With the increase of annual rainfall, Size and reproductive branch number per plant showed the opposite response pattern with latitude.The seed length and reproductive branch stem height and height traits did not show any significant response to the ecological factors.The overall results showed that with the geographical and climatic environmental changes, Baikal Stipa populations showed different breeding strategies.