西藏高寒牧区燕麦生理指标与气象因子的关系研究

Relationship Between Physiological Indicators of Oat and Meteorological Factor in Tibet’s Alpine Pastoral Areas

基于田间试验,分析了西藏高寒牧区燕麦气孔导度(Gs)、蒸腾速率(E)、净光合速率(Pn)的日变化规律及其与西藏典型气象因子(大气温度、太阳辐射、空气相对湿度)的关系,并建立了回归模型。结果表明,Gs、E、Pn的日变化分别出现"双峰"、"多峰"、"双峰"的变化规律,最高值分别为6.495mmol/(m2.s)、42.31mmol/(m2.s)、66.46μmol/(m2.s)。燕麦生理指标Gs、E、Pn与高寒牧区典型气象因素的影响显著性关系分别为:Rs>RH>T、RH>Rs>T、T>RH>Rs。

The field experiment was conducted to analyze the diurnal variation of the stomatal conductance （Gs）, transpiration rate（E）, net photosynthetic rate（Pn）, and the relationships between typical meteoro- logical factors such as atmospheric temperature（T）, solar radiation（Rs）, relative air humidity（RH） and oaths physiological indicators were established by the corresponding regression models. The results showed that the diurnal variations of Gs, E and Pn respectively showed ＇bimodal＇, ＇multimodal;, ＇bimodal＇ and the maximum values respectively were 6.495 mmol/（m2 s）, 42. 31 mmol/（m2 s）, 66.46 μmol/（m2 s）. The significant effects of meteorologic factors（Gs, E, Pn） on oat＇s three physiological indicators were Rs〉 RH〉T, RH〉Rs〉T, T〉RH〉Rs, respectively.