Drought amplifies divergence between the responses of radial growth and resin duct traits to neighbourhood competition

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ID: 329200
2026
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Abstract
Abstract Drought and neighbourhood competition can affect tree growth and resin duct traits, yet how competition responses differ between drought and non-drought conditions remains unclear. We combined tree-ring basal area increment (BAI) with six resin duct traits for 75 focal Larix principis-rupprechtii trees across five study locations in northern China. Annual radial growth was weakly associated with reconstructed annual competition intensity under both drought and non-drought conditions. In contrast, all six resin duct traits and a principal component analysis (PCA)-derived resin duct index were positively associated with competition intensity during drought years, whereas these relationships were weak or absent during non-drought years, with greater divergence between growth and resin duct responses under drought. This pattern was robust to alternative drought definitions, surface-area standardization, and a four-trait PCA excluding derived total traits. Across complementary distribution-specific and Gaussian log1p Bayesian bivariate models, conditional growth–resin duct correlations were generally weak or uncertain across residual, year, plot/location and individual-tree components, although positive correlations were most evident at the individual-tree level for latewood and total resin duct lumen area. Overall, drought was associated with contrasting competition responses of radial growth and resin duct traits without producing a consistent growth–resin duct correlation structure, highlighting environmentally contingent and trait-specific responses to neighbourhood competition in drought-prone forests.
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Authors Xue Wang, Chen Xu, Mingyu Liu, Xianliang Zhang
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Journal Tree physiology
Year 2026
DOI
10.1093/treephys/tpag140
URL
https://doi.org/10.1093/treephys/tpag140
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