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首页> 外文期刊>Trees. Structure and Function >Relationships of photosynthetic capacity to PSII efficiency and to photochemical reflectance index of Pinus taiwanensis through different seasons at high and low elevations of sub-tropical Taiwan
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Relationships of photosynthetic capacity to PSII efficiency and to photochemical reflectance index of Pinus taiwanensis through different seasons at high and low elevations of sub-tropical Taiwan

机译：亚热带台湾高低海拔地区不同季节台湾松光合能力与PSII效率和光化学反射指数的关系

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摘要

We investigated the relationships of photosynthetic capacity (P (nsat), near light-saturated net photosynthetic rate measured at 1,200 mu mol m(-2) s(-1) PPFD) to photosystem II efficiency (F (v)/F (m)) and to photochemical reflectance index [PRI = (R (531) - R (570))/(R (531) + R (570))] of Pinus taiwanensis Hay. needles at high (2,600 m a.s.l) and low-elevation (800 m a.s.l) sites through different seasons. Results indicate that at high-elevation site, P (nsat), F (v)/F (m) and PRI (both measured at predawn) paralleled in general with the air temperature. On the coolest measuring day with the minimum air temperature dropping to -2A degrees C, P (nsat) could decrease to ca. 15% of its highest value, which was measured in autumn. At low-elevation site, with the minimum air temperature of 10-12A degrees C in cooler season and almost no seasonal variation of F (v)/F (m), P (nsat) dropped to ca. 65% of its highest value and PRI decreased ca. 0.02 in winter. Even though seasonal variation of P (nsat) was affected by many factors, it was still closely related to PRI based on statistical analyses using data from both sites, through different seasons. On the contrary, seasonal variation of F (v)/F (m) of P. taiwanensis needles was influenced mainly by low temperature at high elevation. Therefore, the correlation of P (nsat) - F (v)/F (m) was lower than that of P (nsat) - PRI when data combined from both high- and low-elevation sites were analyzed. It is concluded that predawn PRI could be used as an indicator to estimate the seasonal potential of photosynthetic capacity of P. taiwanensis grown at low- and high-elevations of sub-tropical Taiwan.
机译：我们研究了光合能力（P（nsat），在1,200μmol m（-2）s（-1）PPFD下测得的近光饱和净光合速​​率）与光系统II效率（F（v）/ F（m ））以及台湾松（Pinus taiwanensis Hay）的光化学反射指数[PRI =（R（531）-R（570））/（R（531）+ R（570）））。在不同季节，针高（2,600 m a.s.l）和低海拔（800 m a.s.l）的位置。结果表明，在高海拔地区，P（nsat），F（v）/ F（m）和PRI（均在黎明前测量）通常与气温平行。在最凉爽的测量日中，最低空气温度降至-2A摄氏度，P（nsat）可能会降低至大约。最高值的15％，该值是在秋天测得的。在低海拔地区，在凉爽的季节最低气温为10-12A摄氏度，F（v）/ F（m）几乎没有季节变化，P（nsat）降至大约。其最高值和PRI的65％下降了。冬季为0.02。尽管P（nsat）的季节变化受许多因素影响，但根据使用两个站点不同季节数据的统计分析，它仍与PRI密切相关。相反，台湾对虾的F（v）/ F（m）的季节变化主要受高海拔下的低温影响。因此，当分析来自高海拔和低海拔站点的数据时，P（nsat）-F（v）/ F（m）的相关性低于P（nsat）-PRI的相关性。结论是，黎明前的PRI可以作为估算在亚热带台湾低海拔和高海拔地区生长的台湾对虾光合能力的季节性潜力的指标。

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