A STUDY ON THE PHYSIOLOGICAL CHARACTERISTICS OF FOUR MAIN KINDS OF GRASS IN THE GRASSLAND OF INNER MONGOLIA
内蒙古草原四种主要禾本科牧草若干生理特性的研究

The four kinds of grass, namely Bromus inermis, Agropyron cristatum, Elymus sibiricus and Elymus tangutotum,are most important in the grassland in Inner Mongolia. The transpiration intensity, the photosynthesis intensity and the chlorophyll content of these grasses are measured and analysed in this study. The results show that in a day the maximum transpiration intensity of the grasses appears between 12:00 and 14:30 p.m.and it rises a little again at 4:00 p. m. The photosynthesis intensity of the grasses reaches the top in the reproductive stage. There is a linear relationship between the relative humidity of the air and the water content of the grass leaves. The correlation coefficient is 0.993.