Abstract Understanding light-induced plasticity of growth and its relationship with photosynthetic trait plasticity is central to the identification of the mechanisms associated with tropical tree seedling establishment in enrichment plantings. In a secondary forest submitted to silvicultural treatments – that manipulate light environment – and enriched with six tropical tree species we tested three main hypothesis. First, the growth of the six species are related to photosynthetic leaf traits; second, there is a relationship between the light-induced plasticity of growth and photosynthetic leaf traits and, finally, that growth plasticity is a subjacent mechanism of the growth-survival trade-off. Growth was analyzed as a biomass index that combines collar and height growth. Photosynthetic leaf traits were selected considering their significance in the photosynthetic process: light interception (specific leaf area, SLA), light absorption (chlorophyll a and b ratio, Chla/b), light use (fluorescence parameters, Fv/Fm; PIabs, PItotal), biochemical limitations (light-saturated CO2 assimilation, Asat) and diffusive limitations (stomatal conductance, gs). The plasticity was represented by the slope of the relationship between the canopy light transmittance and growth and the photosynthetic leaf traits. At the end of the first year after planting, growth was related to almost all photosynthetic leaf traits, and the strongest relationships (high slope and R2) were observed with Asat, SLA and PItotal. Light-induced growth plasticity varied three times between species. The interspecific growth plasticity was related to SLA and Fv/Fm plasticity, which varied 4.9 and 2.4 times between species, respectively. Seedling mortality in the shaded understory and the growth in a high light environment were associated with growth plasticity. Photosynthetic leaf traits effectively represent the growth response mechanisms to silvicultural treatments that manipulate the light environment in enrichment plantings, and the subjacent mechanism of growth plasticity has an intrinsic effect on the growth-survival trade-off.

中文翻译：

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光合叶片特性是否与热带树苗的第一年生长有关？次生林富集种植的光致可塑性试验

摘要 了解光诱导的生长可塑性及其与光合性状可塑性的关系，对于鉴定与富集种植中热带树木幼苗建立相关的机制至关重要。在接受造林处理（操纵光环境）并富含六种热带树种的次生林中，我们测试了三个主要假设。一是六种植物的生长与光合叶片性状有关；其次，光诱导的生长可塑性与光合叶片性状之间存在关系，最后，生长可塑性是生长-生存权衡的潜在机制。生长被分析为结合领子和高度生长的生物量指数。光合叶片性状的选择考虑了它们在光合作用过程中的重要性：光截留（比叶面积，SLA），光吸收（叶绿素 a 和 b 比，Chla/b），光利用（荧光参数，Fv/Fm；PIabs，PItotal )、生化限制（光饱和 CO2 同化，Asat）和扩散限​​制（气孔导度，gs）。可塑性用冠层透光率与生长与光合叶片性状之间关系的斜率表示。种植后第一年末，生长几乎与所有光合叶片性状有关，与 Asat、SLA 和 PItotal 的关系最强（高坡度和 R2）。光诱导的生长可塑性在物种之间变化三倍。种间生长可塑性与 SLA 和 Fv/Fm 可塑性有关，在物种之间分别变化 4.9 和 2.4 倍。遮荫林下的幼苗死亡率和高光环境中的生长与生长可塑性有关。光合叶片性状有效地代表了对在富集种植中操纵光环境的造林处理的生长反应机制，而生长可塑性的潜在机制对生长-生存权衡具有内在影响。