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Effect of light intensity on tea leaf physiology under field conditions

机译：田间条件下光强对茶叶生理的影响

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Photosynthetic CO_2 fixation (Pn), transpiration loss of water (Tr) and leaf temperature (Lt) in mature leaves of plucked tea bush fully exposed to sun were determined at 200-2200 u mol m~(-2)s~(-1) irradiance of photosynthetic photon flux density (PPFD). Pn significantly increased (P< 0.001) from lower to the next higher PPFD till it reached the light saturation at 1200 [i mol photon. At this light saturation level of irradiance, Pn value was 13.95 u mol CO_2 m~(-2)s~(-1). The next higher PPFD 1400u mol photon significantly (P<0.001) reduced Pn. No significant difference in Pn was observed between 1400,1600 and 1800 mu mol PPFD. There was a sharp decline ( P<0.001) of Pn from 2000 u mol PPFD irradiance and at 2200 mu mol, the Pn value was as low as 6.92 p mol CO_2 m~(-2)s~(-1) which was equivalent to the value at 400 PPFD irradiance. Strong positive correlations between PPFD and leaf temperature (r = 0.9525), PPFD and transpiration (r = 0.9693), as well as leaf temperature and transpiration loss(r = 0.9929) were observed. At optimum irradiance of 1200 i mol PPFD, the corresponding Pn, Tr and Lt were 13.95 u mol CO_2 m~(-2)s~(-1), 5.02 m mol H_2O m~(-2)s~(-1) and 26.46 °C respectively. The curvilinear relationships between PPFD and Pn (r2! =0.8856), transpiration and Pn (r~2 = 0.6939) as well as Lt and Pn (r~2= 0.6272) were significant.
机译：在200-2200 u mol m〜（-2）s〜（-1）下测定完全采光的采摘茶灌木成熟叶片的光合作用CO_2固定（Pn），水分蒸腾损失（Tr）和叶片温度（Lt）。 ）光合光子通量密度（PPFD）的辐照度。 Pn从较低的PPFD到下一个较高的PPFD显着增加（P <0.001），直到达到1200 [i mol光子]的光饱和为止。在此光饱和度下，Pn值为13.95 u mol CO_2 m〜（-2）s〜（-1）。下一个更高的PPFD 1400u mol光子显着（P <0.001）降低了Pn。在1400,1600和1800μmol PPFD之间未观察到Pn的显着差异。与2000 u mol PPFD辐照度相比，Pn急剧下降（P <0.001），在2200μmol下，Pn值低至6.92 p mol CO_2 m〜（-2）s〜（-1），相当于到400 PPFD辐照度下的值。观察到PPFD与叶片温度（r = 0.9525），PPFD与蒸腾作用（r = 0.9693）之间以及叶片温度和蒸腾损失（r = 0.9929）之间均具有强正相关。在1200 i mol PPFD的最佳辐照度下，相应的Pn，Tr和Lt为13.95 u mol CO_2 m〜（-2）s〜（-1），5.02 m mol H_2O m〜（-2）s〜（-1） ）和26.46°C。 PPFD和Pn（r2！= 0.8856），蒸腾作用和Pn（r〜2 = 0.6939）以及Lt和Pn（r〜2 = 0.6272）之间的曲线关系很显着。

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