Effects of Light and Temperature Factors on Biomass Accumulation of Winter Wheat
摘要
[Objective]The study aimed to discuss the influence of light and temperature factors on biomass accumulation of winter wheat at each growth stage and changes in biomass of each organ.[Method]Based on the observation data from Xifeng Agrometeorological Experiment Station of Gansu Province,including phenophase and yield factors of winter wheat in 1981-2008,biomass at three-leaves,overwintering,jointing,heading,milky maturity,and maturity stages in 1995-2008,and meteorological data in 1995-2008,the variation patterns of the biomass accumulation and the influence of TEP(thermal effectiveness photosynthetically active radiation)on the biomass of winter wheat at every growth stage were analyzed.[Result]The biomass accumulation of winter wheat in the whole growth period presentedScurve,with the maximum value from heading to milky maturity stage.Since 1981,TEP from heading to milky maturity stage increased with a rate of 3.314 MJ/(m2·a),and the changing curves of TEP at other stages were like parable curves.TEP from turning green to jointing stage and from milky maturity to maturity stage had a higher value in the 1990s and a lower value in the 1980s and early 21stcentury,while that from jointing to heading stage had a lower value in the1990s but a higher value in the 1980s and early 21stcentury.There was a significant correlation between TEP at each growth stage and the actual yield.LAI(leaf area index)at each development stage also had a significant correlation with the utilization rate of TEP at corresponding stage.When LAI at jointing and heading stages increased by 1,the utilization rate of TEP correspondingly increased by 0.049 and 0.259 g/MJ respectively.[Conclusion]The research could provide theoretical references for the scientific planting and management of winter wheat in future.