Variations in leaf economics spectrum traits for an evergreen coniferous species: Tree size dominates over environment factors
Variations in leaf economics spectrum traits for an evergreen coniferous species: Tree size dominates over environment factors
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常绿针叶树种叶片经济谱特征的变化：树木大小主导环境因素
DOI：
10.1111/1365-2435.13498
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发表时间：
2020-01-14
影响因子：
5.2
通讯作者：
Jin, Guangze
中科院分区：
文献类型：
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作者：
Liu, Zhili;Hikosaka, Kouki;Jin, Guangze
许多叶片性状随树木大小和环境因子的变化而强烈变化，但这些因子对森林树木叶片性状种内变异的重要性很少被同时评估。我们测量了常绿针叶树种红松（Pinus koraiensis Sieb） 65个胸径0.3 ~ 100 cm的个体的针叶寿命、比叶面积（SLA）和每个针龄（0 ~ 4年）的氮含量。调查。在中国东北。同时评价了树形（胸径或树高）和环境因子（光照强度、土壤氮含量和水分有效性）对针叶寿命、叶片氮含量、叶片氮含量的影响，以及叶片氮含量和叶片氮含量随针叶年龄的回归斜率。所研究的叶片性状、叶片叶片氮含量与针龄的回归曲线斜率均与树高呈极显著相关。树高对树梢寿命和基于面积的叶片氮含量（N <s:2>ᵣₑ）的影响更大，而胸径对针叶寿命和基于质量的叶片氮含量（Nₛₛ）的影响更大。光照强度、土壤氮含量和水分有效性等环境变量对性状变异的影响较小。光照强度仅对针叶寿命有显著影响，土壤氮和水分有效性对叶片性状无显著影响。我们的研究清楚地表明，树的大小是一个重要的驱动因素，种内变异的关键叶片性状在一个天然森林的红杉。我们还强调胸径或树高的重要性取决于叶片性状，这表明大小效应对叶片性状的种内变化有不同的机制。我们认为叶片性状变异的生态意义需要考虑到树的大小效应。在本文的支持信息中可以找到一个免费的简单语言摘要。
Many leaf traits strongly vary with tree size and environmental factors, but the importance of these factors to intraspecific variations of leaf traits in forest trees has rarely been simultaneously evaluated. We measured needle longevity and specific leaf area (SLA) and nitrogen (N) content of every needle age (0‐ to 4‐year old) for 65 individuals with 0.3–100 cm diameter at breast height (DBH) for an evergreen coniferous species, Pinus koraiensis Sieb. et Zucc., in Northeast China. We simultaneously evaluated the effects of tree size (DBH or tree height) and environment factors (light intensity, soil N content and water availability) on the needle longevity, SLA, foliage N content as well as the slopes of regressions of SLA and foliage N content against needle age. All of the studied leaf traits and slopes of regressions of SLA and foliage N content against needle age were significantly related to tree size. Tree height had a greater impact on SLA and area‐based leaf N content (Nₐᵣₑₐ), whereas DBH was more important for needle longevity and mass‐based leaf N content (Nₘₐₛₛ). The environment variables, light intensity, soil N content and water availability, were rather minor factors for trait variations compared with tree size. Significant influence of light intensity was found only on needle longevity, and soil N and water availability had no effects on the leaf traits. Our study clearly showed that tree size is an important driver of intraspecific variations in the key leaf traits of P. koraiensis in a natural forest. We also emphasize the importance of DBH or tree height varies depending on leaf traits, suggesting various mechanisms of size effects on the intraspecific variations in leaf traits. We suggest that ecological significance of leaf trait variations needs reconsideration incorporating tree size effect. A free Plain Language Summary can be found within the Supporting Information of this article.