Effects of soil moisture on growth characteristics of Leymus chinensis seedlings under different temperature conditions

Abstract

Abstract: The experiment was conducted to stimulate the responses of growth characteristics of L.chinensis seedlings to 5 soil moisture and 5 temperature levels in the control growth chambers.The responses of biomass to soil moisture were altered with different temperatures.The curve equations of response of plant biomass to soil moisture were cubic or quadratic at 20～26 ℃,but were exponential at 29～32 ℃.Light and moderate soil droughts slightly promoted the growth at lower or moderate temperatures,while light and moderate drought significantly limited its growth at higher temperatures,indicating the higher sensitivity of Leymus chinensis seedling to soil water stress at higher temperature.Under moderate temperature (26 ℃) condition,there was a linear relationship between the contribution or ratio of root and shoot,and soil moisture.It was suggested that elevated temperature may strengthen the effects of soil drought on the seedling growth,resulting in a decline of adaptability to soil drought for L.chinensis.

Key words: Oryza sativa, Heavy metal pollution, Genetic diversity, Corresponding analysis

CLC Number:

Q948.1

XU Zhenzhu, ZHOU Guangsheng . Effects of soil moisture on growth characteristics of Leymus chinensis seedlings under different temperature conditions[J]. cje, 2005, (3): 256-260.

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