干旱荒漠区早酥和红早酥梨夏季光合作用日变化规律研究  

Diurnal Variation of Photosynthesis of Zaosu and Hongzaosu Pears in Summer in Arid Desert Area

作　　者：韩多红 周德峰 孟好军 HAN Duohong;ZHOU Defeng;MENG Haojun(College of Life Sciences and Engineering,Hexi University,Zhangye 734000,China;Key Provincial Laboratory in Gansu Province for Characteristic Resources Utility in Hexi Corridor,Zhangye 734000,China;Shigangdun Natural Vegetation Management and Protection Station in Ganzhou District,Zhangye 734000,China;Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province,Zhangye 734000,China)

机构地区：[1]河西学院生命科学与工程学院,甘肃张掖734000 [2]甘肃省河西走廊特色资源利用省级重点实验室,甘肃张掖734000 [3]甘州区石岗墩天然植被管护站,甘肃张掖734000 [4]甘肃省祁连山水源涵养林研究院,甘肃张掖734000

出　　处：《河南农业科学》2020年第4期120-123,共4页Journal of Henan Agricultural Sciences

基　　金：甘肃省林业和草原科技计划项目(2019kj028)。

摘　　要：为了解河西走廊早酥和红早酥梨光合作用日变化的差异,利用LI-6400XT便携式光合作用测定系统对其光合特性日变化进行测定。结果表明,早酥和红早酥梨的净光合速率(Pn)日变化均为双峰型曲线,早酥的Pn均值为5.07μmol/(m^2·s),大于红早酥的Pn均值[4.91μmol/(m^2·s)];早酥和红早酥梨的蒸腾速率(Tr)日变化为双峰曲线,早酥的Tr小于红早酥梨;早酥和红早酥梨均存在光合“午休”现象,原因主要为气孔限制因素。早酥和红早酥梨的日均水分利用效率(WUE)差异不大,分别为2.05、2.02μmol/mmol,气孔导度(Gs)的日变化趋势呈相同规律。In order to understand the diurnal variation of photosynthetic characteristics of Zaosu and Hongzaosu pears,the diurnal variation of photosynthetic characteristics was measured by LI-6400XT portable photosynthetic measurement system.The results showed that the diurnal changes of the net photosynthetic rate(Pn)of Zaosu,Hongzaosu pears were both double-peak curve,and the mean of the Pn of Zaosu was 5.07μmol/(m^2·s),which was larger than that of Hongzaosu,4.91μmol/(m^2·s).The diurnal variation of the Tr of Zaosu and Hongzaosu pears was a double-peak curve,and the Tr of Zaosu pear was smaller than that of Hongzaosu pear.Zaosu and Hongzaosu pears had photosynthetic“siesta”phenomenon,and the main reason was stomatal restriction.There was little difference in WUE between Zaosu and Hongzaosu pears(2.05,2.02μmol/mmol respectively),and the diurnal variation trend of Gs was the same.

关 键 词：干旱荒漠区 早酥梨 红早酥梨 光合作用 日变化 

分 类 号：S685[农业科学—观赏园艺]