A comparative study on photosynthesis and transpiration of Kelimeris integrifolia in summer and autumn on Songnen grasslands of China

Abstract

Abstract: The diurnal changes in photosynthesis and transpiration of Kelimeris integrifolia in Summer and Autumn on Songnen grasslands were characterized as a two-peak curve,but with some differences between two seasons. It was shown that environmental conditions and plant internal factors had a strong effects on plant photosynthesis and transpiration. The net photosynthetic and transpiration rates of the leaves were positively correlated to photosynthetically active radiation (P<0.01),and negatively correlated to stomatal resistance as well as intercellular CO₂ concentration (P<0.05). The transpiration rate was positively correlated to leaf temperature and water saturation deficit of the air. Among the above factors,photosynthesis active radiation was the dominant factor,and stomatal resistance also played an important role in plant photosynthesis and transpiration.

Key words: Net photosynthetic rate, Transpiration rate, Kelimeris integrifolia, Grassland, Grain for Green Project, remote sensing, the region containing the upper and middle reaches of China’s Yangtze River, NDVI

CLC Number:

Q142
Q948

DU Hongmei, WANG Deli, SUN Wei . A comparative study on photosynthesis and transpiration of Kelimeris integrifolia in summer and autumn on Songnen grasslands of China[J]. Chinese Journal of Applied Ecology, 2002, (12): 1600-1604.

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