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Establishment of apparent quantum yield and maximum ecosystem assimilation on Tibetan Plateau alpine meadow ecosystem

机译:青藏高原高寒草甸生态系统表观量子产量和最大生态系统同化的建立

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The alpine meadow is widely distributed on the Tibetan Plateau with an area of about 1.2x10~6km~2. Damxung County, located in the hinterland of the Tibetan Plateau, is the place covered with this typical vegetation. An open-path eddy covariance system was set up in Damxung rangeland station to measure the carbon flux of alpine meadow from July to October, 2003. The continuous carbon flux data were used to analyze the relationship between net ecosystem carbon dioxide exchange (NEE) and photosynthetically active radiation (PAR), as well as the seasonal patterns of apparent quantum yield (α) and maximum ecosystem assimilation (P_(max)). Results showed that the daytime NEE fitted fairly well with the PAR in a rectangular hyperbola function, with α declining in the order of peak growth period (0.0244 μmolCO_2 · μmol~(-1)PAR) > early growth period > seed maturing period > withering period (0.0098 μmolCO_2 · μmol~(-1)AR). The P_(max) did not change greatly during the first three periods, with an average of 0.433 mgCO2 · m~(-2) · s~(-1), i.e. 9.829 μmolCO_2 · m~(-2) · s~(-1). However, during the withering period, P_(max) was only 0.35 mgCO_2 · m~(-2) · s~(-1), i.e. 7.945 μmolCO_2 · m~(-2) · s~(-1). Compared with other grassland ecosystems, the α of the Tibetan Plateau alpine meadow ecosystem was much lower.
机译:高寒草甸广泛分布在青藏高原上,面积约1.2x10〜6km〜2。当青县位于青藏高原的腹地,是种有这种典型植被的地方。 2003年7月至10月,在当雄牧场站建立了一个开放路径的涡度协方差系统,用于测量高寒草甸的碳通量。连续的碳通量数据用于分析净生态系统二氧化碳交换量与光合有效辐射(PAR)以及表观量子产量(α)和最大生态系统同化(P_(max))的季节模式。结果表明,白天的NEE在矩形双曲线函数中与PAR非常吻合,α以峰生长期(0.0244μmolCO_2·μmol〜(-1)PAR)的顺序递减>早生期>种子成熟期>枯萎周期(0.0098μmolCO_2·μmol〜(-1)AR)。前三个时期的P_(max)变化不大,平均为0.433 mgCO2·m〜(-2)·s〜(-1),即9.829μmolCO_2·m〜(-2)·s〜( -1)。但是,在枯萎期,P_(max)仅为0.35mgCO_2·m〜(-2)·s〜(-1),即7.945μmolCO_2·m〜(-2)·s〜(-1)。与其他草地生态系统相比,青藏高原高寒草甸生态系统的α值要低得多。

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