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首页> 外文期刊>Agricultural and Forest Meteorology >Simple envelope-based reconstruction methods can infer light partitioning among individual plants in sparse and dense herbaceous canopies.
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Simple envelope-based reconstruction methods can infer light partitioning among individual plants in sparse and dense herbaceous canopies.

机译：简单的基于包络的重建方法可以推断稀疏和浓密草冠层中各个植物之间的光分配。

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摘要

Light interception controls the growth potential of species and individuals in plant communities. However, the effects of competition for light on short term vegetation dynamics are still poorly understood. This is in part due to a lack of quantitative methods to estimate this resource capture by individual plants within a canopy. In this paper, we studied the light interception of herbaceous plants with contrasting architectures (monocultures and binary mixtures) grown at high or low density and sought to determine the important architectural features necessary to account for light partitioning among individual plants. It was shown that the plant populations studied were typical of a wide range of competition intensities, ranging from sparse plants to dense size-structured populations. Plant representations using whole plant envelopes with homogeneous leaf area density (LAD) were not reliable to estimate light partitioning, irrespective of the accuracy of envelope definition. Accounting for heterogeneous LAD within plants helped to solve this problem in both sparse and dense canopies. The relative importance of traits however changed with competition intensity and was different from reports made on isolated plants. Simple envelope-based reconstructions were finally shown robust enough to support parameterisation from a tractable set of traits measured in the field provided that height and vertical LAD gradient were characterised.Digital Object Identifier http://dx.doi.org/10.1016/j.agrformet.2012.06.014
机译：光拦截控制了植物群落中物种和个体的生长潜力。然而，光竞争对短期植被动态的影响仍然知之甚少。部分原因是由于缺乏定量方法来估算冠层内各个植物捕获的资源。在本文中，我们研究了以高密度或低密度种植的具有对比结构（单一栽培和二元混合物）的草本植物对光的拦截，并试图确定重要的建筑特征，以解释各个植物之间的光分配。结果表明，所研究的植物种群是各种竞争强度的典型特征，从稀疏植物到密集的大小结构种群。不管包膜定义的准确性如何，使用具有均匀叶面积密度（LAD）的整个植物包膜的植物表示法都不可靠，无法估计光分配。对植物内异质LAD的考虑有助于解决稀疏和密集树冠中的这一问题。然而，性状的相对重要性随竞争强度而改变，并且与关于离体植物的报道不同。最后证明了基于简单包络的重构具有足够的鲁棒性，可以支持在野外测得的一组易处理特征中进行参数化，前提是要表征高度和垂直LAD梯度.Digital Object Identifier http://dx.doi.org/10.1016/j。 agrformet.2012.06.014

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