Response of canopy quantum yield of alpine meadow to temperature under low atmospheric pressure on Tibetan Plateau
Response of canopy quantum yield of alpine meadow to temperature under low atmospheric pressure on Tibetan Plateau
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DOI：
10.1007/s11430-006-8219-0
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发表时间：
2006-11
期刊：
影响因子：
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通讯作者：
Lingling Xu;Xian-zhou Zhang;P. Shi;Guirui Yu
中科院分区：
文献类型：
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作者：
Lingling Xu;Xian-zhou Zhang;P. Shi;Guirui Yu
2003年7 ~ 10月，在当雄草地站建立了一个开放路径涡度相关系统，对该地区的碳通量进行了测量。利用弱光条件下生态系统净CO2交换（NEE）与光合有效辐射（PAR）的线性关系，计算了高寒草甸冠层量子效率（α），并探讨了温度对α的影响。结果表明，冠层α值随温度的升高呈线性下降，温度每升高1 °C，冠层α值的下降幅度与C3植物叶片水平的变化趋势相似。冠层α值随温度的变化趋势为：开始时为0.0005 μ molCO 2·μmol− 1 PAR，到9月时增加到0.0008 μ molCO 2·μmol− 1 PAR，并随植物生长阶段的不同而呈上升趋势。与用矩形双曲线函数计算的冠层α值相比，本文方法计算的冠层α值偏低。然而，这里提出的方法在检查α与关键环境因素（如温度）之间的关系方面具有优势。
An open-path eddy covariance system was set up in Damxung rangeland station to measure the carbon flux from July to October, 2003. The canopy quantum yield (α) of alpine meadow was calculated by the linear function between the net ecosystem carbon dioxide exchange (NEE) and the photosynthetic active radiation (PAR) under low light, and how it was influenced by the temperature was also discussed. Results showed that the canopyαdecreased almost linearly with temperature, with the decrease in every 1 °C increase of temperature similar to those measured on leaf level of C3plant. At the beginning, the decrease of canopyαwith temperature was 0.0005 μmol CO2·μmol−1PAR; while it increased to 0.0008 μmol CO2·μmol−1PAR in September, showing a rising trend with plant growing stages. Compared with the canopyαcalculated with rectangular hyperbola function, the value in the paper was lower. However, the method advanced here has the advantages in examining the relationship betweenαand the key environmental factors, such as temperature.