Field C
Department of Biological Sciences, Stanford University, 94305, Stanford, California, USA.
Oecologia. 1983 Feb;56(2-3):341-347. doi: 10.1007/BF00379710.
Simulations using a biochemically-based model of leaf photosynthesis make it possible to predict the distribution of leaf nitrogen contents that maximizes photosynthetic carbon gain over the canopy of an entire plant. In general, the optimal nitrogen content increased with increasing daily photosynthetically active photon irradiance.Leaf aging in natural environments tended to produce leaf nitrogen contents that were similar to the optimal values but somewhat more clustered. Nitrogen redistribution over the duration of a leaf involves costs that are smaller than the benefits in increased photosynthesis. The costs could become larger than the benefits if nitrogen were redistributed on a shorter time scale.
利用基于生化的叶片光合作用模型进行的模拟，能够预测使整株植物冠层光合碳增益最大化的叶片氮含量分布。一般来说，最佳氮含量随每日光合有效光子辐照度的增加而增加。自然环境中的叶片衰老往往会产生与最佳值相似但更为集中的叶片氮含量。叶片在其生命周期内的氮再分配所涉及的成本，小于光合作用增加带来的益处。如果氮在更短的时间尺度上进行再分配，成本可能会大于益处。
