摘要:植物功能性状之间的协调性揭示了其适应特定生境的主要策略，而植物早期生长与功能性状可能具有很大关联性。为探讨林下引入耐阴树种的根、茎、叶功能性状协调性及其与生长的关系，研究了杉木人工林林下引入5种常绿阔叶树种（洒金叶珊瑚、杨桐、蚊母树、栀子和海桐）的生长率（树高和地径相对增长率）以及27个根茎叶形态、生理性状指标。结果表明：（1）由主成分分析（Principal component analysis，PCA）可知耐阴树种种间根茎功能性状关联更紧密。此外，种间根、茎性状的变异系数均小于叶面积；（2）耐阴树种种间和种内关键性状与生长率网络关联性差异较大。在种间水平上，生长率与大部分叶性状显著正相关，与根茎性状多为显著负相关；在种内水平上，关键性状与生长率关系网更加复杂；（3）树高相对增长率是种间和种内关系网中心性最高的生长率指标。种间中心性最高的性状指标是叶面积；叶、茎生物量占比和根干物质含量是种内中心性最高的性状指标。但只有叶面积与树高相对增长率在种间和种内均显著正相关，因此，叶面积更适合作为指示林下耐阴树种生长率变化的性状。总体上，耐阴树种叶性状对生长率的调控要强于根茎性状，其中引入较大叶面积的常绿阔叶树种可能更有利于杉木纯林的人促更新和高效复层林的构建。



Abstract:The coordination between plant functional traits reveals the main strategies to adapt to specific habitats. The plant growth rate may be correlated with functional traits during early growth. To explore the variation characteristics of the roots, stems and leaves functional traits and their relationship with the relative growth rate of five introduced evergreen broad-leaved tree species (ie., Ancuba japonica (Thunb). var. Variegata D'ombr.; Adinandra millettii (Hook. et Arn.) Benth. et Hook. f. ex Hance;Distylium racemosum Sieb.et Zucc.; Gardenia jasminoides Ellis in Philos. Trans.; Pittosporum tobira (Thunb.) Ait.) under the Cunninghamia lanceolata (Lamb.) Hook. plantations, the relative growth rate of tree height and basal diameter and 27 morphological and physiological traits of roots, stems and leaves of the five introduced tree species were studied. The results showed that: (1) According to the principal component analysis (PCA), the functional traits of different shade-tolerant trees roots and stems were more closely related than leaves traits. In addition, the coefficients of variation of roots and stems traits in the inter-species were smaller than the leaf area. (2) The trait correlation network between the key traits and relative growth rate in the inter- and intra-species varied greatly. In the inter-specific correlation network, the relative growth rates were significantly positively correlated with most leaves traits, and negatively correlated with most roots and stems traits. The correlations network between key traits and relative growth rates were more complex in the intra-specific relationships. (3) The relative growth rate of tree height was the growth rate indicator with the highest centrality in the relationship network of inter- and intra-species. Leaf area was the highest centrality in the inter-specific correlation network. The Leaf biomass fraction, stem biomass fraction and root dry matter content had the highest centrality in intra-specific correlation network. However, only the leaf area and relative growth rate of tree height showed a significant and positive correlation in inter- and intra-species. Therefore, the leaf area was more suitable variable for predicting the relative growth rate of shade-tolerant tree species under C. lanceolata plantations. Overall, the leaves traits regulate the relative growth rate more than stems and roots traits. The introduction of evergreen broad-leaved tree species with larger leaf areas may be more conducive to reforestation and the construction of efficient multi-layer of C. lanceolata plantations.





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