Relationship Between Leaf Water Potential of Oat and Meteorological Factor in Alpine Pastoral Areas of Tibet
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Abstract:
The alpine pastoral area of Tibet has high elevation, large daily temperature range, strong solar radiation, and high variation of air humidity. In this study, the field experiment was conducted to analyze the diurnal variation of leaf water potential of oat (ψL) and its relationship with the typical meteorological factors such as atmospheric temperature (T), solar radiation (Rs), and relative air humidity (RH) to establish the corresponding regression models. The experiment results showed that the daily variation of oat’s ψL is significantly different during different growth stages. The oat’s ψL showed ‘V-type’ during the seeding stage and heading stage; while it showed ‘W-type’ during the jointing stage and tillering stage, and the maximum variation range of ψL can reach 6 MPa in a day. Based on the regression analysis, the order of significant effects of meteorological factors on oat's ψL was T>RH>Rs. These results are of vital significance for seeking the hydrologic cycle rules of the irrigated grass, formulating the scientific irrigation schedule, and increasing the water use efficiency of grass growing in the alpine area.
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