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應(yīng)用

Y(II)或ΔF/FM’ 或 (FM’ – FS )/FM’) 是經(jīng)受時(shí)間考驗(yàn)的光適應(yīng)測量參數(shù)，比FV/FM對(duì)更多類型的植物脅迫更加敏感。已有的大量證據(jù)表明FV/FM對(duì)許多種植物脅迫和健康植物的光系統(tǒng)II的測量十分出色，而Y(II)或光量子產(chǎn)額則可測量實(shí)際光照下光適應(yīng)環(huán)境和生理狀況的光系統(tǒng)II的效率。

原理

采用調(diào)制飽和脈沖原理，測量植物的葉綠素?zé)晒猓ㄟ^相關(guān)文獻(xiàn)的研究成果，計(jì)算植物的光量子產(chǎn)額及相對(duì)電子傳遞速率，同時(shí)可測量PAR、葉溫、相對(duì)濕度等環(huán)境參數(shù)。

特點(diǎn)

葉片吸收測量：提供葉片吸收測量及隨環(huán)境變化導(dǎo)致的葉片吸收變化。根據(jù)Eichelman (2004) 葉片吸收在健康植物的變化范圍在0.7~0.9 之間。因此，為獲得準(zhǔn)確的ETR或“J”，Y(II)測量儀提供了一個(gè)可靠的測量方法，

FV/FM測量單元：可額外選配FV/FM測量儀，用于暗適應(yīng)測量。

具有暗適應(yīng)葉夾

陽光下屏幕可見

圖形顯示FV/FM曲線

2GB存儲(chǔ)空間

USB通訊

數(shù)據(jù)Excel查看

先進(jìn)的PAR葉夾：采用底部葉夾打開裝置，防止測量時(shí)誤操作打開葉夾。對(duì)傳感器進(jìn)行余弦校正，確保葉片相對(duì)測量光的角度不變。

FM’校正：對(duì)于具有高光照強(qiáng)度歷史的植物，完全關(guān)閉光反應(yīng)中心是一個(gè)問題，Y(II)測量儀使用Loriaux &Genty 2013的方法進(jìn)行FM’校正，確保誤差*小。

自動(dòng)調(diào)制光設(shè)定：快速準(zhǔn)確自動(dòng)的調(diào)整合適的調(diào)制光強(qiáng)，避免人工操作的誤差。

先進(jìn)算法避免飽和脈沖NPQ：采用25ms內(nèi)8點(diǎn)的平均值確定FM’，消除飽和脈沖NPQ的影響。

更精確的葉溫測量：采用非接觸式紅外測量，測量精度可達(dá)±0.5℃。

直接測量相對(duì)濕度：含有測量氣體交換使用的固態(tài)傳感器，可測量相對(duì)濕度。

降低葉片遮擋的設(shè)計(jì)：傾斜的角度減少對(duì)葉片的遮擋，可以測量擬南芥等小葉。

系統(tǒng)組成

標(biāo)配：

Y(II)光量子產(chǎn)額測量儀、充電器、USB電纜、便攜箱、2個(gè)吸收測量單元、U盤（包含說明書）。

可選：

FV/FM測量儀及10個(gè)暗適應(yīng)葉夾、三腳架。

技術(shù)指標(biāo)

測量參數(shù)：

Y(II)或ΔF/Fm‘、ETR、PAR、T、FMS或FM’、Fs、α(葉片吸收)。

監(jiān)測模式：可使用電腦，長時(shí)間監(jiān)測Y(II)、ETR、葉片吸收、PAR、葉溫、相對(duì)濕度、及計(jì)算NPQ。

相對(duì)濕度：5%~95%，±2%。

可選參數(shù)：F_V/F_M、F_V/F_O，F(xiàn)_O， F_M， F_V。

可使用AC或USB供電，可配三腳架。

技術(shù)參數(shù)：

光源

飽和脈沖：白色LED具有PAR時(shí)7000μmols

調(diào)制光：紅色LED 660nm，具有690nm短波過濾。

光化光源：僅可使用外部光源

檢測方法：調(diào)制脈沖法

檢測器&過濾器：具有700~750nm帶通過濾的PIN光電二極管

取樣速率：1~10000點(diǎn)/秒自動(dòng)切換。

測量時(shí)間：3s或長期監(jiān)測

存儲(chǔ)空間：2GB

輸出：USB

尺寸：便攜箱尺寸為14”x 11”x 6”，儀器為9’’長

質(zhì)量：Y(II) 測量儀0.45 kg

FV/FM測量儀0.36 kg.

總重1.95 kg.

產(chǎn)地

美國

文獻(xiàn)

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