Sun Jun, Chen Xiaoping, Wang Mantang, Li Jinlong, Zhong Quanlin, Cheng Dongliang
Fujian Provincial Key Laboratory of Plant Ecophysiology Fujian Normal University Fuzhou China.
School of City and Civil Engineering Zaozhuang University Zaozhuang China.
Ecol Evol. 2020 Nov 12;10(23):13395-13402. doi: 10.1002/ece3.6943. eCollection 2020 Dec.
Understanding the scaling between leaf size and leafing intensity (leaf number per stem size) is crucial for comprehending theories about the leaf costs and benefits in the leaf size-twig size spectrum. However, the scaling scope of leaf size versus leafing intensity changes along the twig leaf size variation in different leaf habit species remains elusive. Here, we hypothesize that the numerical value of scaling exponent for leaf mass versus leafing intensity in twig is governed by the minimum leaf mass versus maximum leaf mass ( versus ) and constrained to be ≤-1.0. We tested this hypothesis by analyzing the twigs of 123 species datasets compiled in the subtropical mountain forest. The standardized major axis regression (SMA) analyses showed the scaled as the 1.19 power of and the -α (-1.19) were not statistically different from the exponents of versus leafing intensity in whole data. Across leaf habit groups, the scaled negatively and isometrically with respect to leafing intensity. The pooled data's scaling exponents ranged from -1.14 to -0.96 for and versus the leafing intensity based on stem volume (LIV). In the case of and versus the leafing intensity based on stem mass (LIM), the scaling exponents ranged from -1.24 to -1.04. Our hypothesis successfully predicts that the scaling relationship between leaf mass and leafing intensity is constrained to be ≤-1.0. More importantly, the lower limit to scaling of leaf mass and leafing intensity may be closely correlated with versus . Besides, constrained by the maximum leaf mass expansion, the broad scope range between leaf size and number may be insensitive to leaf habit groups in subtropical mountain forest.
了解叶片大小与展叶强度（每茎大小的叶片数量）之间的比例关系对于理解叶片大小 - 小枝大小范围内叶片成本与效益的理论至关重要。然而，不同叶习性物种中，随着小枝叶大小变化，叶片大小与展叶强度的比例范围仍不明确。在此，我们假设小枝中叶片质量与展叶强度的比例指数数值由最小叶片质量与最大叶片质量（ 与 ）决定，并受限于≤ -1.0。我们通过分析亚热带山地森林中汇编的123个物种数据集的小枝来检验这一假设。标准化主轴回归（SMA）分析表明， 按 的1.19次幂缩放，且 -α（-1.19）与整个数据中 与展叶强度的指数在统计学上无差异。在各个叶习性组中， 相对于展叶强度呈负向且等比缩放。基于茎体积（LIV）的 和 与展叶强度的合并数据比例指数范围为 -1.14至 -0.96。在基于茎质量（LIM）的 和 与展叶强度的情况下，比例指数范围为 -1.24至 -1.04。我们的假设成功预测了叶片质量与展叶强度之间的比例关系受限于≤ -1.0。更重要的是，叶片质量与展叶强度缩放的下限可能与 与 密切相关。此外，受最大叶片质量扩展的限制，亚热带山地森林中叶片大小与数量之间的广泛范围可能对叶习性组不敏感。
