摘要
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 of Beijing,the changes of day photosynthetic rate and transpiration rate at three growing stages,which include leaf stage,bolting stage and bud stage were determined under different soil moisture,i.e.sufficient soil moisture,medium soil moisture and drought.There is nooning phenomenon in chicory.Its net photosynthetic rate (Pn) of leaf climbs up to the peak value at the leaf stage,then goes down,and rises a little in the bud stage.As far as transpiration rate (Tr) is concerned, the result is:bud stage>bolting stage>leaf stage.There is quadratic linear relationship between Pn and Tr.Low soil moisture can affect Pn and Tr,and leads to nooning phenomenon early.
出处
《中国草地》
CSCD
2004年第4期37-40,45,共5页
Grassland of China
基金
十五"国家重点科技攻关项目(2001BA508B23)
北京市科技计划项目(H020720010630)共同资助
关键词
菊苣
干旱
光合
蒸腾
Chicory
Drought
Photosynthesis
Transpiration
