中温型和暖温型草原五种植物构件生长与水热组合关系研究

在暖温型和中温型草原对大针茅（Stipa grandis）、羊草（Leymus chinensis）、糙隐子草（Cleisto-genes squorrosa）、达乌里胡枝子（Lespedeza dahurica）和阿尔泰狗哇花（Heteropappus altaicus）5个共有植物种群的构件生长特征进行了比较研究，并应用种群统计的生长分析指标与研究站点的月平均温度、降水量和湿润度进行了灰色关联分析。结果表明，中温型草原各共有种的相对生长速率（DRGR&;DRGRa）和单位叶速率（DULA）均高于暖温型草原，显示出对中温型草原生长季短、热量条件不足的生态适应特征；而暖温型草原则以较长的叶面积及构件持续时间适应该草原区生长季长、热量较为充足的气修条件。暖温型草原各共有种的构件生长指标与湿润度之间的灰色关联度普遍高于中温型草原，即暖温型草原植物的构件生长对生长季内的水热组合更为敏感，显示出不同热量型草原区植物构件生长的响应特征。

Relationship between modular growth characteristics of five plant species and water and heat combination in warm-temperate and moderate-temperate steppes

Applying comparative study on the characteristics of modular growth of five mutual species such as Stipa grandis, Leymus chinensis, Cleistogenes squorrosa, Lespedeza dahurica and Heteropappus altaicus, the grey-correlative analyses between the demographic growth analysis indexes and average temperature , precipitation and moisture had been carried out during months of the growth seasons from 1999 to 2000 in Research Stations of warm-temperate and moderate-temperate steppes of Inner Mongolia. The results demonstrated that the indexes of DRGR & DRGRa and DULA of these species were all higher in moderate-temperate steppe than warm-temperate steppe, showing the ecological characteristics of adaption themselves to the climate of shorter growth season and inadequate thermal condition,while longer duration of leaf area and modular quantity ( DLAD & DMND) of these species reflected the adaption of the longer growth season and sufficient quantity of heat in warm-temperate steppe. Meanwhile, the greycorrelative degree between modular growth indexes of these species and moisture was remarkably higher in warm-temperate steppe than in moderate-temperate steppe, showing that modular growth of plant individual was more sensitive to the combination of water and heat in growth season in warm-temperate steppe,and indicating the response characteristics of plant modular growth in different thermal steppe region.