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根据北京地区的气候特点设置水分充足、中度干旱和干旱三个处理,测定菊苣叶片光合和蒸腾速率的日变化规律和3个生育时期(莲座叶簇期、抽薹初期、现蕾期)的变化规律。结果表明,菊苣叶片的净光合速率和蒸腾速率都有双峰型日变化规律;土壤水分不足能明显降低菊苣叶片的净光合速率和蒸腾速率,加剧或提前菊苣“光午休”现象的发生;菊苣在抽薹初期对水分缺失反应较敏感;叶片净光合速率和蒸腾速率存在弱的二次线性相关关系。
According to the climate characteristics of Beijing area, we set up the three treatments of adequate water content, moderate drought and drought, determined the diurnal variation of photosynthesis and transpiration rate and the changes of three growth stages (rosette leaf stage, bolting stage, bud stage) law. The results showed that diurnal variation of net photosynthetic rate and transpiration rate had the bimodal pattern in the chicory leaves. The deficient soil moisture could significantly reduce the net photosynthetic rate and transpiration rate of the chicory leaves, and aggravate or advance the occurrence of chicory ; Chicory was more sensitive to water loss reaction at the early bolting stage; there was a weak quadratic linear correlation between net photosynthetic rate and transpiration rate.