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arXiv 2210.00409stat.APstat.ME
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植物性状和反射率的多元函数联合建模

Joint Multivariate and Functional Modeling for Plant Traits and Reflectances

Philip A. White, Michael F. Christensen, Henry Frye, Alan E. Gelfand, John A. Silander

摘要:

叶水平性状对不同环境条件响应的研究对于理解植物生态学具有重要意义。遥感技术使得能够测量植物的反射率,以沿着环境梯度推断潜在的特征。虽然很多重点放在了解反射率和性状是如何在叶水平相关,建模的挑战,这种关系的依赖性,沿环境梯度限制了这条调查线。在这里,我们采取的问题,联合建模的特点和反射率给定的环境。我们的目标是评估不仅对环境回归因子的反应,而且在这种回归的背景下,性状水平和反射光谱之间的依赖性。这导致联合建模的特征与反射率作为一个功能响应的波长光谱的响应向量。为了进行这项调查,我们采用了一个全球生物多样性热点,在南非的大开普省植物区系的数据集。

英文摘要:

The investigation of leaf-level traits in response to varying environmental conditions has immense importance for understanding plant ecology. Remote sensing technology enables measurement of the reflectance of plants to make inferences about underlying traits along environmental gradients. While much focus has been placed on understanding how reflectance and traits are related at the leaf-level, the challenge of modelling the dependence of this relationship along environmental gradients has limited this line of inquiry. Here, we take up the problem of jointly modeling traits and reflectance given environment. Our objective is to assess not only response to environmental regressors but also dependence between trait levels and the reflectance spectrum in the context of this regression. This leads to joint modeling of a response vector of traits with reflectance arising as a functional response over the wavelength spectrum. To conduct this investigation, we employ a dataset from a global biodiversity hotspot, the Greater Cape Floristic Region in South Africa.

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