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Y(II)或ΔF/FM’ 或 (FM’ – FS )/FM’) 是经受时间考验的光适应测量参数,比FV/FM对更多类型的植物胁迫更加敏感。已有的大量证据表明FV/FM对许多种植物胁迫和健康植物的光系统II的测量十分出色,而Y(II)或光量子产额则可测量实际光照下光适应环境和生理状况的光系统II的效率。


叶片吸收测量:提供叶片吸收测量及随环境变化导致的叶片吸收变化。根据Eichelman (2004) 叶片吸收在健康植物的变化范围在0.7~0.9 之间。因此,为获得准确的ETR或“J”,Y(II)测量仪提供了一个可靠的测量方法,



FM’校正:对于具有高光照强度历史的植物,完全关闭光反应中心是一个问题,Y(II)测量仪使用Loriaux &Genty 2013的方法进行FM’校正,确保误差最小。


Y(II)或ΔF/Fm‘、ETR、PAR、T叶温、FMS或FM’、Fs、α(叶片吸收)、空气相对湿度、FV/FM、FV/FO,FO, FM, FV
调制光:红色LED 660nm,具有690nm短波过滤。
尺寸:便携箱尺寸为14”x 11”x 6”,仪器为9’’长
质量:Y(II) 测量仪0.45 kg
FV/FM测量仪0.36 kg.
总重1.95 kg.
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