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高寒退化草地狼毒种群个体大小与茎、叶的异速生长

李钰,赵成章**,侯兆疆,马小丽,张茜   

  1. (西北师范大学地理与环境科学学院, 甘肃省湿地资源保护与产业发展工程研究中心, 兰州 730070)
  • 出版日期:2013-02-10 发布日期:2013-02-10

Body size and stem- and leaf allometry of Stellera chamaejasme in degraded alpine grassland.

LI Yu, ZHAO Cheng-zhang**, HOU Zhao-jiang, MA Xiao-li, ZHANG Qian   

  1. (Research Center of Wetland Resources Protection and Industrial Development Engineering of Gansu Province, College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China)
  • Online:2013-02-10 Published:2013-02-10

摘要: 叶片和茎的生长规律决定植物对光截取的模式以及与外界环境的物质交换面积,其生物量分配是研究植物生活史对策的一个重要途径。在石羊河上游高寒退化草地,采用标准化主轴估计(standardized major axis estimation, SMA)方法,研究了狼毒(Stellera chamaejasme)种群茎大小对茎与叶生物量分配的影响,以及对叶面积支持效率的影响。结果表明:狼毒种群茎干重与比叶重(LMA)、单叶面积、叶干重呈异速生长关系,SMA斜率分别为0.781(95%的置信区间,CI=0.71~0.94)、0.824(CI=0.77~0.95)和0.856(CI=0.79~0.99)。狼毒种群中较大茎的狼毒植株具有较高的叶生物量分配比例和叶面积支持效率,同时具有较高的比叶重,说明较大的狼毒采取以提高资源利用效率为主的适应策略,而相对较小的狼毒采取以快速生长为主的适应策略。

关键词: 花生, 早稻, 蒸腾速率, 气孔导度, 水分胁迫

Abstract: The growth patterns of leaf and stem decide the light capture pattern of plants and the acreage of the material exchange between plants and external environment, whereas the biomass allocation is a main approach to study the plant life history strategies. Taking the degraded alpine grassland in the upper reaches of Shiyang River, Gansu Province of Northwest China as a case, the method of standardized major axis (SA-M) estimation was adopted to study the effects of Stellera chamaejasme- stem size on the biomass allocation in leaf and stem, and on the leaf area supporting efficiency. There existed an allometric relationship between the stem dry mass and the LMA, individual leaf area, and leaf dry mass, with a SMA slope of 0.781 (95% confidence interval, CI=0.71-0.94), 0.824 (CI=0.77-0.95), and 0.856 (CI=0.79-0.99), respectively. The S. chamaejasme with bigger stem had higher leaf biomass allocation percentage and leaf area supporting efficiency, and in the meantime, had higher LMA, indicating that the bigger S. chamaejasme mainly adopted an adaptive strategy of high resource-use efficiency, while the smaller one mainly employed an adaptive strategy of fast growth.

Key words: Peanut, Early rice, Transpiration rate, Stomatal conductance, Water stress