CAJ | 학술논문

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CO_2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.
채용Li-6400편휴식광합측정계통,측정한작조건하인충재배적량충빙초속식물광합생리특성.결과표명,정광합속솔Pn일변화균위쌍봉형,제1봉치균출현재10:00좌우,제2봉치균출현재16:00.재오후14:00,유우기공한제인소소치,출현료불동정도적광합"오휴"현상,PAR시인기"오휴"적간접인소.증등속솔Tr화기공도도Gs일변화균위쌍봉곡선,봉치시간여정광합속솔일치.포간CO_2농도Ci일변화근사V자형,14:00좌우강지최저.량충식물협편수압우결VPD변화추세일치,이수분이용효솔WUE일변화상반.상술각광합생리삼수일균치대소표현위몽고빙초고우사생빙초.배경인자Ca화Ta대몽고빙초적Pn일변화영향교대;Ca화RH대사생빙초적Pn일변화영향교대,동시대량충식물적Tr일변화영향야교대;량충식물적Pn화Tr적주요생리영향인자시Gs화VPD.
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 PA R 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 CO_2 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 diumal 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.