Influence of leaf size of plant on leaf transpiration and temperature in arid regions

doi:10.3724/SP.J.1258.2013.00045

Abstract

Abstract:

Aims Our objective was to demonstrate the influence of leaf size on leaf transpiration and temperature in arid regions.
Methods Based on energy and material exchange theory and the results of previous studies, we set up a single leaf energy and material exchange model combined with arid environmental conditions.
Important findings Leaf transpiration decreased with increasing stomatal resistance, but leaf temperature increased. Leaf transpiration and temperature decreased with decreasing leaf radiation absorption rate in the same environmental conditions. Moreover, leaf width and wind speed were important parameters in understanding leaf energy and material exchange. Leaf transpiration and temperature generally decreased with decreasing leaf width with wind speed <0.1 m·s ^-1 and stomatal resistance about 1000 s·m ^-1. Low leaf transpiration and temperature could encourage plant growth with the low water availability, high radiation and high temperature conditions in arid regions.

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Key words: arid plant adaptation characteristics, leaf boundary layer resistance, leaf temperature, leaf transpiration, leaf width

LIU Ming-Hu,XIN Zhi-Ming,XU Jun,SUN Fei,DOU Li-Jun,LI Yong-Hua. Influence of leaf size of plant on leaf transpiration and temperature in arid regions[J]. Chin J Plant Ecol, 2013, 37(5): 436-442.

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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2013.00045

https://www.plant-ecology.com/EN/Y2013/V37/I5/436

Figures/Tables 4

Table 1 Parameters and default values

参数 Parameter	预设值 Default value
气温 Air temperature (℃)	30
初始叶温 Initial leaf temperature (℃)	30
气压 Atmospheric pressure (kPa)	88
相对湿度 Relative humidity (%)	20
辐射 Radiation (W·m^-2)	1000
辐射吸收率 Radiation absorption rate (%)	30, 70
气孔阻力 Stomatal resistance (s·m^-1)	1, 10, 100, 1000
风速 Wind speed (m·s ^-1)	0.01, 0.1, 1, 5, 10
叶片最大宽度 Maximum leaf width (mm)	1, 2, 3…28, 29, 30

Fig. 1 Effect of maximum width of leaf on leaf transpiration and surface leaf temperature under different wind speeds. A, B, Stomatal resistance 1 s·m-1. C, D, Stomatal resistance 10 s·m-1. E, F, Stomatal resistance 100 s·m-1. G, H, Stomatal resistance 1000 s·m-1. Other environmental parameters are: radiation 1000 W·s-1; radiation absorption rate 30%; air temperature 30 °C; relative air humidity 20%; atmospheric pressure 88 kPa.

Fig. 2 Effect of maximum width of leaf on leaf transpiration and surface leaf temperature under different wind speeds. A, B, Stomatal resistance 1 s·m-1. C, D, Stomatal resistance 10 s·m-1. E, F, Stomatal resistance 100 s·m-1. G, H, Stomatal resistance 1000 s·m-1. Other environmental parameters are: radiation 1000 W·s-1; radiation absorption rate 70%; air temperature 30 °C; relative air humidity 20%; barometric pressure 88 kPa.

Fig. 3 Rate of heat conduction and convection changing with various leaf width and wind speeds. Other environmental parameters are: radiation 1000 W·s-1; radiation absorption rate 70%; air temperature 30 °C; relative air humidity 20%; barometric pressure 88 kPa.

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