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首页> 外文期刊>Annals of Botany >Interspecific prediction of photosynthetic light response curves using specific leaf mass and leaf nitrogen content: effects of differences in soil fertility and growth irradiance
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Interspecific prediction of photosynthetic light response curves using specific leaf mass and leaf nitrogen content: effects of differences in soil fertility and growth irradiance

机译：使用特定叶片质量和叶片氮含量的光合光响应曲线的种间预测：土壤肥力和生长辐照度差异的影响

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Previous work has shown that the entire photosynthetic light response curve, based on both Mitscherlich and MichaelisMenten functions, could be predicted in an interspecific context through allometric relations linking the parameters of these functions to two static leaf traits: leaf nitrogen (N) content and leaf mass per area (LMA). This paper describes to what extent these allometric relations are robust to changes in soil fertility and the growth irradiance of the plants. Plants of 25 herbaceous species were grown under controlled conditions in factorial combinations of low/high soil fertility and low/high growth irradiance. Net photosynthetic rates per unit dry mass were measured at light intensities ranging from 0 to 700 mol m(2) s(1) photosynthetically active radiation (PAR). The differing growth environments induced large changes in N, LMA and in each of the parameter estimates of the Mitscherlich and MichaelisMenten functions. However, the differing growth environments induced only small (although significant) changes in the allometric relationships linking N and LMA to the parameters of the two functions. As a result, 88 (Mitcherlich) and 89 (MichaelisMenten) of the observed net photosynthetic rates over the full range of light intensities (0700 mol m(2) s(1) PAR) and across all four growth environments could be predicted using only N and LMA using the same allometric relations. These results suggest the possibility of predicting net photosynthetic rates in nature across species over the full range of light intensities using readily available data.
机译：先前的研究表明，基于米切尔里奇（Mitscherlich）和米歇尔·门腾（MichaelisMenten）函数的整个光合作用光响应曲线，可以通过异种关系通过将这些函数的参数与两个静态叶片性状联系起来的异速关系来预测：叶氮（N）含量和叶片每单位面积质量（LMA）。本文描述了这些异速关系在多大程度上对土壤肥力和植物生长辐照度的变化具有鲁棒性。在受控条件下，以低/高土壤肥力和低/高生长辐照度的组合生长了25种草本植物。在0至700 mol m（2）s（1）光合有效辐射（PAR）的光强度下测量每单位干质量的净光合速率。不同的生长环境导致N，LMA以及Mitscherlich和MichaelisMenten函数的每个参数估计值发生较大变化。但是，不同的生长环境仅在将N和LMA链接到两个函数的参数的异位关系中引起了很小的（尽管很明显）变化。结果，仅使用预报就可以预测在整个光强度范围（0700 mol m（2）s（1）PAR）和所有四个生长环境中观察到的净光合速率的88（Mitcherlich）和89（MichaelisMenten） N和LMA使用相同的异构关系。这些结果表明，可以使用现有数据预测整个物种在整个光强度范围内自然净净光合速率。

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