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两种冰草属植物光合生理特性研究
引用本文:闫伟红,徐柱,马玉宝,李临杭.两种冰草属植物光合生理特性研究[J].科技导报(北京),2010,28(4):42-46.
作者姓名:闫伟红  徐柱  马玉宝  李临杭
作者单位:中国农业科学院草原研究所;农业部草地资源与生态重点开放实验室,呼和浩特 010010
基金项目:国家重点基础研究发展计划(973计划)项目 
摘    要: 采用Li-6400便携式光合测定系统,测定旱作条件下引种栽培的两种冰草属植物光合生理特性。结果表明,净光合速率Pn日变化均为双峰型,第1峰值均出现在10:00左右,第2峰值均出现在16:00。在午后14:00,由于气孔限制因素所致,出现了不同程度的光合“午休”现象,PAR是引起“午休”的间接因素。蒸腾速率Tr和气孔导度Gs日变化均为双峰曲线,峰值时间与净光合速率一致。胞间CO2浓度Ci日变化近似V字形,14:00左右降至最低。两种植物叶片水压亏缺VPD变化趋势一致,而水分利用效率WUE日变化相反。上述各光合生理参数日均值大小表现为蒙古冰草高于沙生冰草。环境因子Ca和Ta对蒙古冰草的Pn日变化影响较大;Ca和RH对沙生冰草的Pn日变化影响较大,同时对两种植物的Tr日变化影响也较大;两种植物的Pn和Tr的主要生理影响因子是Gs和VPD。

关 键 词:蒙古冰草    沙生冰草    净光合速率    蒸腾速率

Photosynthetic Physiological Characteristics of Two Species of Agropyron
Abstract:The photosynthetic physiological characteristics of two species of Agropyron introduced and cultivated under dry conditions were measured by Li-6400 portable photosynthesis system. The results show that the diurnal variations of net photosynthetic rates have double peaks, with the first peak at 10:00, and the second at 16:00, with "noon break" at 14:00 obviously because of constraints caused by stomata, and with PAR as an indirect factor; the diurnal variations of transpiration rate and stomata conductance also have double peak, with the same peak times as the net photosynthetic rate; the diurnal variation of intercellular CO2 concentration is roughly in a V-shape, with the minimum at 14:00; the diurnal variations of leave's water pressure deficit of two species are in the same trend, while the diurnal variations of water use efficiency are in the opposite trends; the averages of these photosynthetic physiological parameters of Agropyron mongolicum are higher than those of Agropyron desertorum. Ca and Ta have a greater effect on the diurnal dynamics of Pn of A. mongolicum, Ca and RH have a greater effect on the diurnal dynamics of Pn of Agropyron desertorum, while Ca and RH have a greater effect on the diurnal dynamics of Tr of two species, Gs and the VPD have a greater physiological effect on the diurnal dynamics of Pn and Tr of two species.
Keywords:Agropyron mongolicum  Agropyron desertorum  net photosynthetic rate  transpiration rate
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