Welcome to Chinese Journal of Applied Ecology! Today is Share:

Chinese Journal of Applied Ecology ›› 2002, Vol. ›› Issue (10): 1235-1239.

Previous Articles     Next Articles

LUO Weihong1, Mayumi Yoshimoto2, DAI Jianfeng1, ZHU Jianguo3, HAN Yong3, LIU Gan 3   

  1. 1. MOA Key Laboratory of Crop Growth Regulation, Nanjing Agricultural University, Nanjing 210095;
    2. Atmospheric Impacts Research Unit, National Institute for Agro-Environmental Sciences, Kannondai 3-1-3, Tsukuba, Ibaraki 305-8604, Japan;
    3. Nanjing Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008
  • Received:2002-06-12 Revised:2002-08-07

Abstract: In this study, the free-air CO2 enrichment (FACE) system (setup at at Anzhen,Wuxi, Jiangsu Province in2001) was used to investigate the effects of FACEon rice canopy microclimate. The rice canopy microclimate observations were carried out from August 26 to October 13, 2001,when the rice crops were at the heading to maturing development stage. The results showed that FACEreduced the rice leaf stomatal conductance. The rice leaf stomatal conductance difference between FACEand ambient was larger among upper layer leaves than among lower layer leaves and at heading and milk filling stages than at maturing stage. FACEincreased daytime rice canopy temperature but had little effect on nighttime rice canopy temperature. The daytime rice canopy temperature difference between FACEand ambient was larger at heading and milk filling stages than at maturing stage. From heading to flowering, the daily maximum rice canopy temperature difference between FACEand ambient reached 1.2℃ under fine weather condition. The average daytime rice canopy temperature from flowering to maturing stage was about 0.43℃. Daytime air temperature inside rice canopy was also affected by FACE. Daytime air temperature inside rice canopy was higher in FACEplot than in ambient plot. The value of daytime air temperature difference between FACEand ambient increased with the increase of solar radiation and varied with height. The maximum daytime air temperature difference between FACEand ambient varied between0.47～1.2℃ and 0.37～0.8℃ at middle of canopy and canopy height, respectively. Air humidity and nighttime air temperature inside rice canopy were not significantly affected by FACE. These results indicate that FACEreducing rice leaf stomatal conductance was the major cause of the increase of canopy temperature and inside canopy air temperature in FACEplot. The higher canopy temperature and inside canopy air temperature in FACEplot resulted in the earlier maturity of rice crop in FACEplot than that in the ambient plot.

Key words: drought stress, Xanthoceras sorbifolia, protective enzyme., rewatering, gas exchange, chlorophyll fluorescence

CLC Number: