Intra-specific variations of two Leymus chinensis divergence populations in Songnen Plain, Northeast China
  • 【DOI】

    10.3321/j.issn:1001-0742.2002.01.004

  • 【摘要】

    Population demography, seed production, biomassallocation, net photosynthesis and transpiration of two Leymuschinensis divergence populations and between two years in Songnenplain, northeast China wer... 展开>>Population demography, seed production, biomassallocation, net photosynthesis and transpiration of two Leymuschinensis divergence populations and between two years in Songnenplain, northeast China were compared. Strong differences betweenthe dry 1997 and moist 1998 occurred in vegetative shoot and sexualshoot densities, sexual differentiation and tiller densities, aswell as in the lengths of inflorescence, seed numbers perinflorescence, seed weights and biomass allocation in eachpopulation respectively (P<0.01). While strong differences betweenthe two populations occurred in vegetative shoot densities, sexualshoot densities, sexual differentiation and seed weights in eachyear (P<0.01). The differences between the two populations intiller densities and in biomass allocation to sexual shoots were significant (P<0.05). But there were no significant differences between the two populations in the lengths of inflorescence, seed numbers per inflorescence and biomass allocation to rhizomes and vegetative shoots (P>0.05). Excepting the transpiration rate in the early June, the differences between the two populations in net photosynthesis and transpiration rate of vegetative shoots and sexual shoots were strongly significant in the early June and July respectively (P<0.01). Relative stable variations in population demography and physiological traits between the two populations indicated that they are divergently in the Songnen Plain. 收起<<

  • 【作者】

  • 【作者单位】

    Laboratory of Quantitative Vegetation Ecology

  • 【刊期】

    环境科学学报(英文版) ISTIC SCI 2002年1期

  • 【关键词】

    population demography  seed productions  biomass allocation  net photosynthetic rate  transpiration rate  Leymus chinensis populations  Songnen Plain 

  • 【基金项目】

    国家重点基础研究发展计划(973计划) 中国科学院资助项目