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Inversion of net ecosystem CO2 flux measurements for estimation of canopy PAR absorption

机译:反演生态系统净二氧化碳通量,以估算冠层PAR吸收

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The fractional absorption of photosynthetically active radiation (f (PAR) ) is frequently a key variable in models describing terrestrial ecosystem-atmosphere interactions, carbon uptake, growth and biogeochemistry. We present a novel approach to the estimation of the fraction of incident photosynthetically active radiation absorbed by the photosynthetic components of a plant canopy (f (Chl) ). The method uses micrometeorological measurements of CO2 flux and incident radiation to estimate light response parameters from which canopy structure is deduced. Data from two Ameriflux sites in Oklahoma, a tallgrass prairie site and a wheat site, are used to derive 7-day moving average estimates of f (Chl) during three years (1997-1999). The inverse estimates are compared to long-term field measurements of PAR absorption. Good correlations are obtained when the field-measured f (PAR) is scaled by an estimate of the green fraction of total leaf area, although the inverse technique tends to be lower in value than the field measurements.
机译:在描述陆地生态系统-大气相互作用,碳吸收,生长和生物地球化学的模型中,光合活性辐射的分数吸收(f(PAR))通常是关键变量。我们提出一种新颖的方法来估算植物冠层(f(Chl))的光合成分吸收的入射光合有效辐射的比例。该方法使用了CO2通量和入射辐射的微气象测量来估计光响应参数,由此推断出冠层结构。来自俄克拉荷马州的两个Ameriflux站点(一个高草草原站点和一个小麦站点)的数据用于得出三年(1997-1999年)的7天移动平均值f(Chl)。将反估计与PAR吸收的长期现场测量结果进行比较。当通过实测总叶子面积的绿色分数估算实地测得的f(PAR)时,可以获得良好的相关性,尽管逆技术的价值往往比实测的更低。

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