Productivity does not decrease at the climate extremes of tree ranges in the Japanese archipelago
Productivity does not decrease at the climate extremes of tree ranges in the Japanese archipelago
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DOI：
10.1007/s00442-021-05015-5
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发表时间：
2021-08
期刊：
影响因子：
2.7
通讯作者：
Koichi Takahashi
中科院分区：
文献类型：
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作者：
Koichi Takahashi
根据丰度中心假说，植被纬度和海拔分布的冷缘和暖缘是由非生物胁迫引起的生理限制的结果。植物单叶质量林分生产力是衡量整株植物碳增益的综合生理指标。丰度中心假说特别预测了每叶质量的生产力在冷缘和暖缘下降。在日本列岛，树木的主要功能类型由南部的常绿硬木转变为北部的落叶硬木和常绿针叶树，形成了纬向过渡带。本研究利用森林清查资料，分析了各功能类型的单叶质量生产力随年平均温度梯度的变化，验证了丰度中心假说。虽然每叶质量的生产力沿着MAT是可变的，但在每个功能树类型中，它既不增加也不减少。常绿阔叶树和落叶阔叶树的冷缘和落叶阔叶树和常绿针叶树的暖缘的单位叶质量生产力也没有下降。每叶质量生产力与丰度不呈正相关。因此，本研究不支持丰度中心假说。相反，生理或生态限制，特别是在幼苗和幼树阶段，可能是影响这三种功能类型分布边缘的重要过程。
As per the abundant-center hypothesis, the cold- and warm-edges of the latitudinal and elevational distributions of vegetation are the result of physiological limitations caused by abiotic stress. The stand-level productivity per leaf mass of plants is an integrated physiological measure of whole-plant carbon gain. The abundant-center hypothesis specifically predicts that the productivity per leaf mass decreases at cold-edges and warm-edges. In the Japanese archipelago, the dominant functional types of trees change from evergreen hardwoods in the south to deciduous hardwoods and evergreen conifers in the north, forming latitudinal ecotones. This study tested the abundant-center hypothesis by analyzing the productivity per leaf mass of each functional type along a gradient of mean annual temperature (MAT), using forest inventory data. Although productivity per leaf mass was variable along the MAT, it neither increased nor decreased with MAT for each functional tree type. The productivity per leaf mass was also noted to not decrease at the cold-edges for evergreen and deciduous hardwoods or at the warm-edges for deciduous hardwoods and evergreen conifers. Productivity per leaf mass was not positively correlated with abundance. Thus, this study did not support the abundant-center hypothesis. Instead, physiological or ecological limitations, particularly at the seedling and sapling stages, may be the important process affecting the distribution edges of these three functional types.