作　　者： ; ; ; ;

机构地区： 西北农林科技大学资源环境学院

出　　处： 《干旱地区农业研究》 2009年第3期179-183,共5页

摘　　要： 通过采用美国便携式光合作用测定系统实地设置不同CO2浓度,分析了CO2浓度升高对小麦产量贡献较强的两个时期(扬花期和灌浆期)净光合速率、气孔导度、蒸腾速率、胞间CO2浓度等光合特性的影响,预测了未来高二氧化碳浓度条件下小麦水分利用率的变化趋势。结果表明:小麦不同生育期(扬花期和灌浆期)随着CO2浓度增加,净光合速率,叶片胞间CO2浓度,叶片水分利用率总体呈现逐渐上升的趋势,叶片气孔导度和蒸腾速率都呈现先降后升再降的趋势,气孔限制值则呈现逐渐降低的趋势;小麦不同生育期(扬花和灌浆期)CO2浓度与净光合速率,叶片胞间CO2浓度,叶片水分利用率均呈现极显著的正相关,其中与叶片胞间CO2浓度的相关系数最高;与气孔导度和蒸腾速率在扬花期阶段呈现显著正相关,在灌浆期呈现负相关;而与气孔限制值在两个时期均呈现极显著负相关。 Using portable photosynthesis measuring system, the influence of atmospheric CO2 concentration increase on wheat photosynthetic characteristics including net photosynthetic rate （ Pn ）, stomatal conductance （ Cs ）, transpiration rate （Tr） and intercellular CO2 concentration（ Ci）was analyzed in flowering stage and filling stage when the wheat has a comparatively strong field and the changing of water use efficiency under future conditions of high CO2 concentration was predicted. The results indicated that in different growth stages （flowering stage and filling stage）, the net photosynthetic rate （ Pn ）, intercellular CO2 concentration（Ci） and water use efficiency increased gradually with the increase of CO2 concentration, which is exactly contrary to the stomatal limitation value（ Ls ）, the stomatal conductance （Cs） and transpiration rate （Tr） decreased first and then increased and decreased again at last; CO2 concentration had highly significant positive correlation with the net photosynthetic rate （Pn）, water use efficiency and intercellular CO2 concentration （ Ci ）, of which the correlation coefficient with CO2 concentration （Ci） is the highest; CO2 concentration had significant positive correlation with stomatal conductance （Cs） and transpiration rate （Tr） at flowering stage, exactly on contrary to the filling stage, and meanwhile, the stomata limitation value （Ls）had highly significant negative correlation with CO2 concentration at both two stages. The research can provide scientific basis for high quality and yield wheat cultivation realized by the fully utilizing light and water resources in flowering stage and filling stage under the environmental background with gradually increased atmospheric CO2 concentration.

关 键 词： 浓度 小麦 光合特性 响应曲线 净光合速率

领　　域： [农业科学]