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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 3 - WATER ENGINEERING AND CIVILIZATION : Relationship between Physiological Indicators of Oat and Meteorological Factor in Tibet?s Alpine Pas...
Relationship between Physiological Indicators of Oat and Meteorological Factor in Tibet?s Alpine Pastoral Areas
Author : Pengcheng Tang, Bing Xu, Kezhen Guo and Xiaoyu Gao
The meteorological characteristics are high temperature difference, strong solar radiation and significant change of air humidity in the alpine area of Tibet. According to these features, the field experiment was conducted to analyze the diurnal variation of the leaf water potential (? ), stomatal L conductance (G ), transpiration rate (E) and net photosynthetic rate (Pn). Meanwhile, the relationship s between typical meteorological factors such as atmospheric temperature (T), solar radiation (R ), relative s air humidity (RH) with oat's physiological indicators were investigated with the corresponding regression models. The experiment results show that the daily oat?s ? changed obviously during the different L growth stages. The daily oat?s change curve ? show ?V-type? in the seeding and heading stages, and the L lowest value respectively appeared in 5:00 a.m and 4:00 p.m. However, oat?s ? show ?W-type? in the L jointing and tillering stages in which the lowest value both appeared in the morning and afternoon. The maximum change range of ? can reach 6 MPa in a day. At the same time, the diurnal variation of G , E L s and Pn respectively show ?bimodal?, ?multimodal?, ?bimodal?. In detail, the maximum value respectively -2 -1 -2 -1 -2 -1 were 6.495 millimol?m s ,42.31 millimol?m s , 66.46śmolm s which appeared in 9:00 a.m, 4:00 p.m, 12:00 a.m. Based on the regression analysis, the effect order of meteorologic factors on oat's four physiological indicators are:T>RH>R ; R >RH>T; RH>R >T; T>RH>R , respectively for ? , G , E and Pn. s s s s L s These results are useful to understand the hydrologic cycle of the irrigated grass, and determine the scientific irrigation schedule with improve water use efficiency of grass in the alpine area.
File Size : 294,824 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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