Osada Noriyuki
Tomakomai Research Station, Field Science Center for Northern Biosphere, Hokkaido University, Tomakomai 053-0035, Japan
Am J Bot. 2017 Apr;104(4):550-558. doi: 10.3732/ajb.1600444. Epub 2017 Apr 19.
Timing of budburst () may be related to the functional traits and distributions of woody species in temperate regions. Although many previous studies have investigated in a number of temperate species, it has seldom been linked to multiple plant trait relationships.
and plant traits were investigated for 24 woody species for 2 years in a warm-temperate secondary forest in Japan. Particular attention was paid to differences in trait relationships between coexisting deciduous and evergreen broad-leaved species.
was correlated with plant traits in deciduous but not evergreen broad-leaved species; was later for deciduous species with greater leaf mass, leaf area, vessel diameter, and leaf nitrogen content per unit mass. In addition, was later for species with more northern distributions in deciduous and evergreen species.
Clear differences in the trait relationships between deciduous and evergreen broad-leaved species might be caused by different selection pressures on ; selection is expected to be more severe in deciduous species. Overall, the continuous variable of vessel diameter might be used as a simple and effective trait to predict of deciduous species regardless of wood anatomy; however, no such traits were detected as effective predictors of in evergreen species at this study site. In addition, was earlier for the species of more southern distributions, suggesting that such species benefit more from warming.
芽萌动时间（）可能与温带地区木本植物的功能性状及分布有关。尽管此前已有许多研究对多种温带物种的芽萌动时间进行了调查，但很少将其与多种植物性状关系联系起来。
在日本一个暖温带次生林中，对24种木本植物的芽萌动时间和植物性状进行了为期2年的调查。特别关注了共存的落叶阔叶树种和常绿阔叶树种在性状关系上的差异。
芽萌动时间与落叶阔叶树种的植物性状相关，而与常绿阔叶树种无关；叶片质量、叶面积、导管直径和单位质量叶氮含量较高的落叶树种，其芽萌动时间较晚。此外，落叶树种和常绿树种中，分布更靠北的物种芽萌动时间较晚。
落叶阔叶树种和常绿阔叶树种在性状关系上的明显差异，可能是由于对芽萌动时间的选择压力不同所致；预计落叶树种的选择压力更大。总体而言，导管直径这一连续变量可作为一个简单有效的性状，用于预测落叶树种的芽萌动时间，而无需考虑木材解剖结构；然而，在本研究地点，未检测到任何此类性状可作为常绿树种芽萌动时间的有效预测指标。此外，分布更靠南的物种芽萌动时间较早，这表明此类物种从气候变暖中受益更多。
