Leaf nutrient basis for the differentiation of photosynthetic traits between subtropical evergreen and deciduous trees

常绿 每年落叶的 亚热带 光合作用 生物 营养物 植物 生态学
作者
Qi Shi,Bin He,Jürgen Knauer,José Javier Peguero‐Pina,Shi‐Bao Zhang,Wei Huang
出处
期刊:Plant Physiology [Oxford University Press]
标识
DOI:10.1093/plphys/kiae566
摘要

Compared to evergreens, deciduous tree species usually have higher photosynthetic efficiency to complete vegetative and reproductive growth in a shorter growing season. However, the nutrient basis for the differentiation of photosynthesis functional traits between evergreen and deciduous tree species has not yet been clarified. Thirty evergreen and twenty deciduous angiosperm tree species from a subtropical common garden were compared in terms of photosynthetic traits and leaf nutrients. Generally, their differences in area-based photosynthetic capacity were uncorrelated with area-based leaf nutrient content but were caused by the fraction of nitrogen allocated to photosynthetic components. By comparison, the differences in mass-based photosynthetic capacity were more correlated with leaf nitrogen content than leaf phosphorus and potassium content. Convergence in phosphorus and potassium constraints to photosynthesis occurred in deciduous tree species but not in evergreen tree species. Furthermore, leaf C/N ratio played a more significant role than leaf mass per area in determining the differentiation of photosynthetic traits between evergreen and deciduous groups. Our findings provide insight into the nutrient basis for photosynthetic carbon gain and functional strategies across trees species.

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