On the resolution requirements for accurately representing interactions between plant canopy structure and function in three-dimensional leaf-resolving models
On the resolution requirements for accurately representing interactions between plant canopy structure and function in three-dimensional leaf-resolving models
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三维叶片解析模型中准确表征植物冠层结构与功能相互作用的分辨率要求
DOI：
10.1093/insilicoplants/diab023
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发表时间：
2021
期刊：
影响因子：
3.1
通讯作者：
E. Kent
中科院分区：
文献类型：
--
作者：
B. Bailey;E. Kent
虽然功能-结构植物模型（FSPMs）已被提出作为一种更好地分析和预测植物结构与功能之间相互作用的工具，但目前尚不清楚需要多大的空间分辨率来充分解决这种相互作用。植物冠层中相邻叶片的阴影在亚叶片尺度上产生极大的吸收辐射空间梯度，而在“叶片分辨”植物模型中通常无法完全解决这一问题。这种无法解决尖锐辐射梯度的问题可能会传播到其他依赖的生物物理模型中，并导致对整个植物和冠层通量的严重高估，其误差明显高于统计学上的“大叶”或浑浊介质模型。低分辨辐射梯度在吸收辐射的概率分布中造成了扩散效应，掩盖了冠层结构的影响，有效地破坏了叶片分辨模型的原始目标。全冠层光合通量误差随LAI、投影面积分数G的增加近似线性增加，随入射漫射辐射分数的增加呈对数递减。当每片叶子只使用一个离散元素时，整个冠层净CO2通量的误差可能超过100%。由于子叶分辨率的误差随着每叶元素数量的增加呈指数下降。这些结果促使更密切地考虑子叶分辨率对模型误差的影响，这可能会促使相对于当前常见做法的分辨率增加。
While functional–structural plant models (FSPMs) have been proposed as a tool for better analysing and predicting interactions between plant structure and function, it is still unclear as to what spatial resolution is required to adequately resolve such interactions. Shadows cast by neighbouring leaves in a plant canopy create extremely large spatial gradients in absorbed radiation at the sub-leaf scale, which are usually not fully resolved in ‘leaf-resolving’ plant models. This failure to resolve sharp radiative gradients can propagate to other dependent biophysical models, and result in dramatic overprediction of whole-plant and -canopy fluxes with errors significantly higher than that of a statistical ‘big leaf’ or turbid medium model. Under-resolving radiative gradients creates a diffusive effect in the probability distribution of absorbed radiation, and smears out the effect of canopy structure, effectively undermining the original goal of a leaf-resolving model. Errors in whole-canopy fluxes of photosynthesis increased approximately linearly with increasing LAI, projected area fraction G, and decreased logarithmically as the fraction of incoming diffuse radiation was increased. When only one discrete element per leaf was used, errors in whole-canopy net CO2 flux could be in excess of 100 %. Errors due to sub-leaf resolution decreased exponentially as the number of elements per leaf was increased. These results prompt closer consideration of the impact of sub-leaf resolution on model errors, which is likely to prompt an increase in resolution relative to current common practice.
影响因子：
5.6
作者：
Bailey, Brian N.
通讯作者：
Bailey, Brian N.