Abstract

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:

S161.4

LUO Weihong, Mayumi Yoshimoto, DAI Jianfeng, ZHU Jianguo, HAN Yong, LIU Gan . [J]. Chinese Journal of Applied Ecology, 2002, (10): 1235-1239.

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