亚热带落叶阔叶树种枫香叶片衰老后的光合能力。
Photosynthetic capacity of senescent leaves for a subtropical broadleaf deciduous tree species Liquidambar formosana Hance.
机构信息
College of Resource and Environment Science, Hunan Normal University, Changsha, 410081, China.
School of the Environment & National Centre for Groundwater Research and Training, Flinders University, Adelaide, SA, 5001, Australia.
出版信息
Sci Rep. 2017 Jul 24;7(1):6323. doi: 10.1038/s41598-017-06629-7.
Photosynthetic capacity and leaf life span generally determine how much carbon a plant assimilates during the growing season. Leaves of deciduous tree species start senescence in late season, but whether the senescent leaves still retain capacity of carbon assimilation remains a question. In this study, we investigated leaf phenology and photosynthesis of a subtropical broadleaf deciduous tree species Liquidambar formosana Hance in the central southern continental China. The results show that L. formosana has extended leaf senescence (more than 2 months) with a substantial number of red leaves persisting on the tree. Leaf photosynthetic capacity decreases over season, but the senescent red leaves still maintain relatively high photosynthetic capacity at 42%, 66% and 66% of the mature leaves for net photosynthesis rate, apparent quantum yield, and quantum yield at the light compensation point, respectively. These results indicate that L. formosana may still contribute to carbon sink during leaf senescence.
光合作用能力和叶片寿命通常决定了植物在生长季节同化多少碳。落叶树种的叶片在季末开始衰老，但衰老叶片是否仍然保留碳同化的能力仍是一个问题。本研究调查了中国中南部大陆亚热带阔叶落叶树种枫香（Liquidambar formosana Hance）的叶片物候和光合作用。结果表明，枫香具有延长的叶片衰老（超过 2 个月），树上仍有大量红叶存在。叶片光合作用能力随季节下降，但衰老的红叶仍保持相对较高的光合作用能力，净光合速率、表观量子产量和光补偿点的量子产量分别为成熟叶片的 42%、66%和 66%。这些结果表明，枫香在叶片衰老过程中可能仍有助于碳汇。
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