羊草地上生物量与其茎、叶形态特征参数关系的研究

The Relationship between Individual Above-ground Biomass and Morphological Characteristics of Leaf and Stem of Leymus chinensis

选用内蒙古典型草原优势植物羊草(Leymus chinensis)的叶生物量、叶长、叶宽、叶长宽积、茎生物量、茎高和茎粗等参数进行相关分析并建立结构模型方程,从局部和整体考量茎和叶的形态特征参数与羊草个体地上生物量的关系.结果表明,叶长宽积、叶长与叶生物量,茎高与茎生物量关系密切;羊草个体地上生物量可以通过叶生物量及叶形态特征参数进行直接或间接描述,茎生物量及茎形态特征参数具有不稳定性,建立结构模型方程时需考虑植物生长时期.

To explore the relationships between biomass of Chinese wild rye and leaf morpholog- ical characteristic,the leaf characteristic of a dominant species （Leyrnus chinensis） in typical grass- land in Inner Mongolia were investigated. The leaf and stem characteristics were measured, including leaf biomass, leaf length,leaf width, stem biomass, stem height and stem diameter, to build structur- al equation model （SEM）. The results indicated that leaf characteristic were positively correlated with stem biomass, such as leaf length multiply by width, leaf biomass, leaf length. Moreover, the aboveground biomass of Leymus chinensis could be directly and indirectly estimated by leaf biomass and characteristic. The growth cycle must be considered into SEM model because leaf biomass and characteristic will change along with plant growth.