【摘要】 在我国北方暖温型草原和中温型草原各选择一个草原监测站点 ,应用 Hunt提出的生长分析指标 ,对两个站点的大针茅、羊草、糙隐子草、达乌里胡枝子和阿尔泰狗哇花 5个共有种的生长特性进行了对比研究 ,结果表明 :5个共有种在暖温型草原和中温型草原两个站点的叶绿素含量、单位叶速率、叶面积比率、叶面积干重比、都表现出很大差异 ;中温型草原植物种的叶绿素含量均高于暖温型草原 ,中温型草原的单位叶速率相对的高于暖温型草原。叶面积比率和叶面积干重比两个站点的数值有较大的差异 ,如同一种植物在同年同月的叶面积干重比就相差很大 ,这是长期在不同水热组合条件下形成的差异 ;而且这两个指标明显受水热状况的影响 ,不同年份表现出较大的可塑性。同时这些指标也存在季节上的波动。显示出温度驱动因素及其水热组合条件对不同热量型草原区域共有植物种的影响。更多还原

【Abstract】 Steppe\|monitoring stations have been chosen respectively in Warm\|temperate Steppe and Moderate\|temperate Steppe in northern China. Applying the growth analyses indexes proposed by Hunt, comparative research has been carried out into the growth characteristics of the mutual species such as Stipa grandis, Leymus chinensis, Cleistogenes squarrosa, Lespedeza dahurica and Heteropappus altaicus in these two steppe stations. The results demonstrate that the indexes all display great differences in the content of chlorophyll, unit leaf rate, leaf area ratio and specific leaf area of the five species in the stations. The content of chlorophyll of these species in Moderate\|temperate Steppe is higher than that in Warm\|temperate Steppe. The unit leaf vate in Moderate\|temperate Steppe is relatively higher than that in the Warm\|temperate Steppe. The numerical value of leaf area ratio and specific leaf area in the two stations are quite different, just as, the specific leaf area of the same plant species may vary greatly in the same month of the same year. This is the special difference formed from different conditions of water and heat combinations over along time. And the two indexes are affected remarkably by water and heat conditions , manifesting big plasticity in different years. Meanwhile, the above indexes show fluctuation in different seasons. This indicates that the driven facter of temperature and conditions of water and heat combinations have influence upon mutual species of different thermal steppe regions.更多还原