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作 者:刘蕊 张鹏举 Liu Rui;Zhang Pengju(Forest Farm of Xichengyi of Ganzhou District in Zhangye City,Zhangye 734000,China)
机构地区:[1]张掖市甘州区西城驿林场,甘肃张掖734000
出 处:《防护林科技》2024年第3期22-24,共3页Protection Forest Science and Technology
基 金:甘肃省林业和草原科技计划项目(2023kj12)。
摘 要:为研究新疆杨的光合作用及其环境适应能力,利用PAM-2100荧光测定仪测定了其叶片的叶绿素荧光参数。结果表明:在8:00—20:00,新疆杨叶片的光合有效辐射(PAR)、光合电子传递速率(ETR)与光化学猝灭系数(q_(P))日变化趋势均呈“双峰”形;在10:00时,光合有效辐射(PAR)和有效量子产量(Yield)出现最大值,且有效量子产量(Yield)的最大值为0.709;PSⅡ最大量子产量(F_(v)/F_(m))全天较高且维持在同一水平,光抑制不明显;在12:00—18:00,光化学猝灭系数(q_(P))开始下降,而非光化学猝灭系数(q_(N))未下降,原初光能转换效率较高,具有较强的光合作用。In order to study the photosynthesis and environmental adaptability of Populus alba var.pyramidalis,the chlorophyll fluorescence parameters of its leaves were determined by PAM-2100 fluorescence analyzer.The results showed as follows:from 8:00 to 20:00,the diurnal variation of the photosynthetically active radiations(PAR),the photochemical electron transport rate(ETR)and the photochemical quenching efficiencies(q_(p))of Populus alba var.pyramidalis leaves all presented double-peak curve;at 10:00,the photosynthetically active radiations(PAR)and the active quantum yield(Yield)of appeared the maximum peak,and the maximum peak of active quantum yield(Yield)was 0.709;the maximum quantum yield of PS II(F_(v)/F_(m))was higher and maintained at the same level throughout the day,and the photoinhibition was not obvious;from 12:00 to 18:00,the photochemical quenching efficiencies(q_(p))decreased while the non-photochemical quenching efficiencies(q_(N))did not decrease;the primary light energy conversion efficiency was higher and the photosynthesis was stronger.
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