Leaf trait networks (LTNs) visualize the intricate linkages reflecting plant trait-functional coordination. Typical karst vegetation, developed from lithological dolomite and limestone, generally exhibits differential communities, possibly due to habitat rock exposure, soil depth, and soil physicochemical properties variations, leading to a shift from plant trait variation to functional linkages. However, how soil and habitat quality affect the differentiation of leaf trait networks remains unclear. LTNs were constructed for typical dolomite and limestone habitats by analyzing twenty-one woody plant leaf traits across fifty-six forest subplots in karst mountains. The differences between dolomite and limestone LTNs were compared using network parameters. The network association of soil and habitat quality was analyzed using redundancy analysis (RDA), Mantle's test, and a random forest model. The limestone LTN exhibited significantly higher edge density with lower diameter and average path length when compared to the dolomite LTN. It indicates LTN differentiation, with the limestone network displaying a more compact architecture and higher connectivity than the dolomite network. The specific leaf phosphorus and leaf nitrogen contents of dolomite LTN, as well as the leaf mass and leaf carbon contents of limestone LTN, significantly contributed to network degree and closeness, serving as crucial node traits regulating LTN connectedness. Additionally, both habitat LTNs significantly correlated with soil nitrogen and phosphorus, stoichiometric ratios, pH, and organic carbon, as well as soil depth and rock exposure rates, with soil depth and rock exposure showing greater relative importance. Soil depth and rock exposure dominate trait network differentiation, with the limestone habitat exhibiting a more compact network architecture than the dolomite habitat.

中文翻译：

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在喀斯特石灰岩和白云岩生境中，岩石暴露和土壤深度在叶片性状网络中的优势超过了土壤质量


叶片性状网络 （LTN） 可视化了反映植物性状-功能协调的错综复杂的联系。典型的喀斯特植被由岩性白云岩和石灰岩发育而成，通常表现出不同的群落，这可能是由于栖息地岩石暴露、土壤深度和土壤理化性质的变化，导致从植物性状变异向功能联系的转变。然而，土壤和生境质量如何影响叶片性状网络的分化仍不清楚。通过分析喀斯特山脉 56 个森林子样地的 21 个木本植物叶性状，为典型的白云岩和石灰岩生境构建了 LTN。使用网络参数比较了白云石和石灰石 LTN 之间的差异。使用冗余分析 （RDA） 、 Mantle 检验和随机森林模型分析土壤和生境质量的网络关联。与白云石 LTN 相比，石灰石 LTN 表现出显着更高的边缘密度、更低的直径和平均路径长度。它表明 LTN 分化，石灰石网络比白云石网络表现出更紧凑的架构和更高的连通性。白云石 LTN 的比叶磷和叶氮含量，以及石灰石 LTN 的叶质量和叶碳含量，对网络程度和紧密性有显著贡献，是调控 LTN 连通性的关键节点性状。此外，两种栖息地 LTN 都与土壤氮和磷、化学计量比、pH 值和有机碳以及土壤深度和岩石暴露率显著相关，其中土壤深度和岩石暴露表现出更大的相对重要性。 土壤深度和岩石暴露是特征网络分化的主要因素，石灰岩生境表现出比白云岩生境更紧凑的网络结构。