摘要
本文利用在田间观测到的辐射、叶片水势、叶温和空气饱和水汽压差对春小麦叶片气孔运动的影响,根据Jarvis的理论建立了上述因子对气孔导度影响的综合模式。对模式的理论分析表明:在低光强下,气孔导度对诸环境因子影响的灵敏度顺序是辐射、叶片温度、叶片水势和空气饱和水汽压差;在高光强下其顺序为叶片温度,叶片水势,光强和空气饱和水气压差。根据此气孔运动综合模式建立了春小麦单叶蒸腾强度的测算模型并将此模型和Pcnman-Monteith公式的计算值和实际观测资料进行了比较,发现蒸腾模型的计算值较实测值偏低,而Penman-Monteith公式的计算值较实测值偏高。
A synthesis model of single leaf stomatal movement has been established based on the theory of Jarvis and field observations of various environmental factors such as solar radiation and water vapour deficit etc. for spring wheat.
Theoretical analysis of the model shows that the sensitivity of stomatato to various factors is in the following order: (1) radiation, leaf temperature, leaf water potential and water vapour deficit at low solar radiation intensity and (2) leaf temperature, leaf water potential, solar radiation and water vapour deficit at high solar radiation intensity.
Furthermore, another function describing single leaf transpiration rate has been deduced from the stomatal model. A comparison between the data calculated by this model and by modified Penman-Monteith equation and the observed data demonstrate that the observed data were slightly higher than the data calculated by this model and were slightly lower than those by modified Penman-Monteith equation.
出处
《高原气象》
CSCD
北大核心
1992年第4期423-430,共8页
Plateau Meteorology
关键词
春小麦
气孔
运动
蒸腾作用
模拟
Spring wheat
Stomatal behaviour
Transpiration
Environmental factors.
