Photosynthesis and physiological traits of evergreen broadleafed saplings during winter under different light environments in a temperate forest
Photosynthesis and physiological traits of evergreen broadleafed saplings during winter under different light environments in a temperate forest
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DOI：
10.1139/b05-144
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发表时间：
2006-01-01
期刊：
影响因子：
--
通讯作者：
Kikuzawa, K
中科院分区：
文献类型：
--
作者：
Miyazawa, Y;Kikuzawa, K
万年青阔叶树种山茶的光合特性。和青冈（Quercus glauca Thunb.）在秋季和冬季连续调查，在不同的光环境（林隙，落叶冠层下，万年青冠层下）在温带森林中生长的树苗。光饱和净光合速率在仲冬和春季低于秋季。光合能力，缩放到一个共同的叶温25摄氏度，增加或保持稳定后，秋季，然后在春季下降，在大多数叶片。不同光环境下山茶和栎的单位叶面积光合特性在多数时期存在差异。而不同光环境下叶片单位叶质量的光合特性差异不大，说明光合特性的差异主要是由于叶片单位面积叶质量的不同造成的。光合速率下的光可用性典型的环境下，在冬季比秋季在阳光下的间隙，但没有不同的万年青树冠下的树荫下的树叶。因此，冬季碳增益的年度碳增益的重要性是小的，但在万年青冠层下的树叶在林窗的树叶。
Photosynthetic traits of the evergreen broadleafed species Camellia japonica L. and Quercus glauca Thunb. were continuously investigated during autumn and winter using saplings that grew in different light environments (gap, deciduous canopy understory, and evergreen canopy understory) in a temperate forest. Light-saturated rates of net photosynthesis in midwinter and spring were lower than those in autumn. Photosynthetic capacity, scaled to a common leaf temperature of 25 degrees C, increased or remained stable after autumn and then decreased in spring in most leaves. Photosynthetic traits per unit leaf area were different among leaves in different light environments of both Camellia and Quercus during most periods. However, photosynthetic traits per unit leaf mass did not differ among leaves in different light environments, suggesting that differences in photosynthetic traits were mainly due to different leaf mass per area among leaves. Photosynthetic rates under light availability typical in the environment were lower in winter than in autumn in leaves in the sun in a gap but were not different in leaves in the shade under evergreen canopy trees. Thus, the importance of winter carbon gain for annual carbon gain is small in leaves in a gap but is large in leaves under evergreen canopy trees.