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首页> 外文期刊>Ecological research >Close relationship between leaf life span and seedling relative growth rate in temperate hardwood species
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Close relationship between leaf life span and seedling relative growth rate in temperate hardwood species

机译：温带阔叶树种叶片寿命与幼苗相对生长率的密切关系

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摘要

The life span of resource-acquiring organs (leaves, shoots, fine roots) is closely associated with species successional position and environmental resource availability. We examined to what extent leaf life span is related to inter- and intraspecific variation in seedling relative growth rate (RGR). We examined relationships between relative growth rate in mass (RGR_M) or height (RGR_H) and leaf life span, together with classical RGR_M components [net assimilation rate (NAR), specific leaf area (SLA), leaf weight ratio (LWR), and leaf area ratio (LAR)] for seedlings of five hardwood species of different successional position across a wide range of environmental resource availability, including the presence or absence of leaf litter in shaded forest understory, small canopy gaps, and large canopy gaps. Both SLA and LAR were negatively correlated with RGR_M along the environmental gradient for all species. However, positive correlations were observed among species within micro-sites, indicating that these two components cannot consistently explain the variation in RGR_M. Both NAR and LWR affect interspecific, but not intraspecific, variation in RGR_M- Leaf life span was negatively correlated with either RGR_M or RGR_H in both inter- and intraspecific comparisons. Species with short-lived, physiologically active leaves have high growth rates, particularly in resource-rich environments. Consequently, leaf life span is a good predictor of seedling RGR. Leaf life span affects plant performance and has a strong and consistent effect on tree seedling growth, even among contrasting environments.
机译：资源获取器官（叶子，枝条，细根）的寿命与物种的继承地位和环境资源的可获得性密切相关。我们研究了叶片寿命在多大程度上与种间和种内幼苗相对生长率（RGR）有关。我们研究了质量相对生长速率（RGR_M）或高度（RGR_H）与叶片寿命之间的关系，以及经典的RGR_M组件[净同化率（NAR），比叶面积（SLA），叶重量比（LWR）和叶面积比（LAR）]，用于在广泛的环境资源可利用范围内具有不同演替位置的5种硬木树种的幼苗，包括林下林下有无凋落物，小冠层间隙和大冠层间隙。沿着环境梯度，所有物种的SLA和LAR与RGR_M均呈负相关。但是，在微场所内的物种之间观察到正相关，表明这两个成分不能始终如一地解释RGR_M的变化。 NAR和LWR都影响种间而非种内的RGR_M变化-在种间和种内比较中，叶片寿命与RGR_M或RGR_H均呈负相关。叶片具有短寿命，具有生理活性的物种具有较高的生长速率，尤其是在资源丰富的环境中。因此，叶片寿命是幼苗RGR的良好预测指标。叶片寿命会影响植物的生长性能，即使在相反的环境中，也会对树苗的生长产生强烈而持续的影响。

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