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Can light‐saturated photosynthesis in lowland tropical forests be estimated by one light level?
Biotropica ( IF 2.1 ) Pub Date : 2020-06-14 , DOI: 10.1111/btp.12817
Lore T. Verryckt 1 , David S. Ellsworth 2 , Sara Vicca 1 , Leandro Van Langenhove 1 , Josep Peñuelas 3, 4 , Philippe Ciais 5 , Juan M. Posada 6 , Clément Stahl 7 , Sabrina Coste 8 , Elodie A. Courtois 9 , Michael Obersteiner 10 , Jérôme Chave 11 , Ivan A. Janssens 1
Affiliation  

Leaf-level net photosynthesis (An) estimates and associated photosynthetic parameters are crucial for accurately parameterizing photosynthesis models. For tropical forests, such data are poorly available and collected at variable light conditions. To avoid over- or underestimation of modeled photosynthesis, it is critical to know at which photosynthetic photon flux density (PPFD) photosynthesis becomes light-saturated. We studied the dependence of An on PPFD in two tropical forests in French Guiana. We estimated the light saturation range, including the lowest PPFD level at which Asat (An at light saturation) is reached, as well as the PPFD range at which Asat remained unaltered. The light saturation range was derived from photosynthetic light-response curves, and within-canopy and interspecific differences were studied. We observed wide light saturation ranges of An. Light saturation ranges differed among canopy heights, but a PPFD level of 1,000 µmol m−2 s−1 was common across all heights, except for pioneer trees species that did not reach light saturation below 2,000 µmol m−2 s−1. A light intensity of 1,000 µmol m−2 s−1 sufficed for measuring Asat of climax species at our study sites, independent of the species or the canopy height. Because of the wide light saturation ranges, results from studies measuring Asat at higher PPFD levels (for upper canopy leaves up to 1,600 µmol m−2 s−1) are comparable with studies measuring at 1,000 µmol m−2 s−1. © 2020 The Association for Tropical Biology and Conservation

中文翻译:

低地热带森林中的光饱和光合作用可以通过一个光照水平来估计吗?

叶级净光合作用 (An) 估计值和相关的光合作用参数对于准确参数化光合作用模型至关重要。对于热带森林,此类数据很难获得并且是在可变光照条件下收集的。为避免高估或低估模拟光合作用,了解光合光子通量密度 (PPFD) 光合作用在哪个光合作用变得光饱和至关重要。我们研究了法属圭亚那两个热带森林中 An 对 PPFD 的依赖性。我们估计了光饱和范围,包括达到 Asat(光饱和时的 An)的最低 PPFD 水平,以及 Asat 保持不变的 PPFD 范围。光饱和范围来自光合光响应曲线,并研究了冠层内和种间差异。我们观察到 An 的宽光饱和范围。树冠高度之间的光饱和度范围不同,但 1,000 µmol m-2 s-1 的 PPFD 水平在所有高度上都很常见,除了未达到 2,000 µmol m-2 s-1 以下光饱和度的先锋树种。1,000 µmol m-2 s-1 的光强度足以在我们的研究地点测量高潮物种的 Asat,与物种或冠层高度无关。由于光饱和度范围很宽,因此在更高 PPFD 水平(对于高达 1,600 µmol m-2 s-1 的上层冠叶)测量 Asat 的研究结果与在 1,000 µmol m-2 s-1 测量的研究结果相当。© 2020 热带生物学与保护协会 除了未达到 2,000 µmol m−2 s−1 以下光饱和度的先锋树种。1,000 µmol m−2 s−1 的光强度足以在我们的研究地点测量高潮物种的 Asat,与物种或冠层高度无关。由于光饱和度范围很宽,因此在更高 PPFD 水平(对于高达 1,600 µmol m-2 s-1 的上层冠叶)测量 Asat 的研究结果与在 1,000 µmol m-2 s-1 测量的研究结果相当。© 2020 热带生物学与保护协会 除了未达到 2,000 µmol m−2 s−1 以下光饱和度的先锋树种。1,000 µmol m−2 s−1 的光强度足以在我们的研究地点测量高潮物种的 Asat,与物种或冠层高度无关。由于光饱和度范围很宽,因此在更高 PPFD 水平(对于高达 1,600 µmol m-2 s-1 的上层冠叶)测量 Asat 的研究结果与在 1,000 µmol m-2 s-1 测量的研究结果相当。© 2020 热带生物学与保护协会 在较高 PPFD 水平(对于高达 1,600 µmol m-2 s-1 的上层冠叶)测量 Asat 的研究结果与在 1,000 µmol m-2 s-1 测量的研究结果相当。© 2020 热带生物学与保护协会 在较高 PPFD 水平(对于高达 1,600 µmol m-2 s-1 的上层冠叶)测量 Asat 的研究结果与在 1,000 µmol m-2 s-1 测量的研究结果相当。© 2020 热带生物学与保护协会
更新日期:2020-06-14
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