A comparative analysis of photosynthetic characteristics of hulless barley at two altitudes on the Tibetan Plateau
A comparative analysis of photosynthetic characteristics of hulless barley at two altitudes on the Tibetan Plateau
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青藏高原两个海拔高度青稞光合特性比较分析
DOI：
10.1007/s11099-011-0016-0
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发表时间：
2011-03-01
期刊：
影响因子：
2.7
通讯作者：
Zhang, X. Z.
中科院分区：
文献类型：
--
作者：
Fan, Y. Z.;Zhong, Z. M.;Zhang, X. Z.
为了测定青藏高原不同海拔C3植物的光合作用特性及其对CO2的敏感性，研究了青藏高原大麦的光合作用特性及其对CO2的敏感性。分别在海拔4,333m和3,688m处生长，通过气体交换测量，模拟了最大净光合作用(Pmax)和表观量子效率(α)等光合作用参数。生长在高海拔地区的植物比生长在低海拔地区的植物具有更高的净光合速率(Pn)、光合作用参数(Pmax和α)和对CO2增加的敏感性。与低海拔植物相比，高海拔植物的Pn、Pmax和α分别提高了约0.20∼0.45%、0.05∼0.20%和0.12∼0.36%。因此，在青藏高原，生长在海拔3,688 m以上的C3植物的光合作用能力和对CO2的光合作用敏感性的变化可能会随着海拔的升高而增加。
To determine the photosynthetic characteristics of C3plants and their sensitivity to CO2at different altitudes on the Tibetan Plateau, hulless barley (Hordeum vulgareL. ssp.vulgare) was grown at altitudes of 4,333 m and 3,688 m. Using gas-exchange measurements, photosynthetic parameters were simulated, including the maximum net photosynthesis (Pmax) and the apparent quantum efficiency (α). Plants growing at higher altitude had higher net photosynthetic rates (PN), photosynthesis parameters (Pmaxand α) and sensitivities to CO2enhancement than plants growing at lower altitude on the Tibetan Plateau. The enhancements ofPN,Pmax, and α for plants growing at higher altitude, corresponding with 10 μmol(CO2) mol−1increments, were approximately 0.20∼0.45%, 0.05∼0.20% and 0.12∼0.36% greater, respectively, than for plants growing at lower altitude, respectively, where CO2levels rose from 10 to 170 μmol(CO2) mol−1. Therefore, on the Tibetan Plateau, the changes in the photosynthetic capacities and the photosynthetic sensitivities to CO2observed in the C3plants grown above 3,688 m are likely to increase with altitude despite the decreasing CO2partial pressure.