陕西渭北旱塬土壤－植物－大气连续体中水分运转规律的研究──Ⅰ．生态环境对植物叶温的影响

STUDIES ON WATER TRANSPORTS IN THE SOIL-PLANT-ATMOSPHERE CONTINUUM ON WEIBEI RAINFED HIGHLAND, SHAANXI PROVINCE──I.EFFECTS OF ECOLOGICAL ENVIRONMEMT ON LEAFTEMPERATURE OF WINTER WHEAT

在整个生长季内，研究了陕西省渭北旱塬主要生态因子对冬小麦叶温的影响．结果表明，叶温与气温呈直线正相关；与大气相对湿度和大气水势呈二次曲线相关；与光量子通量密度是对数正相关．并给出了冬小麦叶温与各生态因子之间的现象学模型．通过主要生态因子对叶温影响的综合分析表明，在陕西渭北旱塬，诸生态因子对冬小麦叶温的重要性依次为：大气温度、大气水势、大气相对湿度和光量子通量密度．

For an entire season of winter wheat, effects of main ecological factors on leaf tem-perature of winter wheat on Weibei Rainfed Highland, Shaanxi Province were studies.The results showed that leaf temperature of winter wheat presented positively linear re-lation with air temperature(Ta), parabolic relation with relative humidity (RH) and the water potential of water vapour in the atmosphere (Ψa), and logarithmic relation with photon flux density (PFD).The phenomenological models of relationship between leaf temperature of winter wheat and ecological factors were established. The analysis of the synthetic action of main ecological factors on leaf temperature of winter wheat showed that on Weibei Rainfed Highland,Shaanxi Province the importance of factors to leaf temperature was in the order of Ta,ψa, RH and PFD.