关键词: 径向变化, 尾巨桉, 日蒸腾量, 液流速率

Abstract: It is an indisputable fact that climate change has affected crop growth and development. In order to predict the possible effects of future climate change on C4 plant maize and to test the simulated results of crop model, an infrared temperatureincreasing simulation experiment was conducted in Jinzhou of Liaoning Province, Northeast China. With the applications of free air temperatureincreasing system and water control devices, different soil moisture and air temperature gradients were installed to simulate the effects of climate change on maize growth. The results showed that increasing temperature alone decreased the plant height by 6.5%, while increasing both temperature and soil moisture had little effects on the plant height. Increasing temperature decreased the leaf area by 13.8%, while increasing soil moisture had little effect. Both increasing temperature and increasing soil moisture were unfavorable to the dry matter accumulation, but the difference with the control was not significant. Increasing temperature had positive effects on the leaf distribution coefficient, but increasing soil moisture was in reverse. Increasing both temperature and soil moisture had no obvious effects on the leaf distribution coefficient. Increasing temperature decreased the grain yield by 40%, mainly due to the decrease of ear length, ear diameter, rows per ear, and full grain number and the increase of shriveled grain number.

Key words: sap flow velocity, daily transpiration., Eucalyptus urophylla×Eucalyptus grandis, radial variation