THE ROLE OF NITROGEN IN A SIMPLE SCHEME TO SCALE-UP PHOTOSYNTHESIS FROM LEAF TO CANOPY
THE ROLE OF NITROGEN IN A SIMPLE SCHEME TO SCALE-UP PHOTOSYNTHESIS FROM LEAF TO CANOPY
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DOI：
10.1111/j.1365-3040.1995.tb00627.x
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发表时间：
1995-10-01
影响因子：
7.3
通讯作者：
JARVIS, PG
中科院分区：
文献类型：
--
作者：
KULL, O;JARVIS, PG
基于叶片中存在两种氮库的假设，提出了一种涉及氮分布的简单分析方案，以扩大从叶片到冠层的光合作用，即光合可降解结构中的氮（N-p）和非光合不可降解结构中的氮（N-s）。假设光子饱和光合作用的速率F-m与N-p成正比，并与光子通量密度（PFD）相似地分布在冠层内。先前对氮的最佳分布的假设不是先决条件，用该方案进行的计算导致了在光合作用适应PFD的时间尺度上可以将冠层视为“大叶子”的假设的发展。对不同PFD需要量树种的参数进行模拟表明，耐阴树种的树冠密度可能比需要阳光的树种高，因为它们叶片中的非光合结构氮和/或支持组织的含量更少。
A simple analytical scheme, involving the distribution of nitrogen, to scale up photosynthesis from leaf to canopy is proposed, The scheme is based on the assumption that there are two pools of nitrogen in leaves: nitrogen in photosynthetic, degradable structures (N-p) and nitrogen in non-photosynthetic and non-degradable structures (N-s). The rate of photon-saturated photosynthesis, F-m, is assumed to be proportional to N-p and is distributed inside the canopy similarly to photon flux density (PFD). Prior assumptions of an optimum distribution of nitrogen are not a prerequisite, Calculations made with the scheme lead to development of the hypothesis that the canopy can be treated as a 'big leaf' on the time scales involved in acclimation of photosynthesis to PFD, Simulations using parameters for tree species with different requirements for PFD show that shade-tolerant species may have denser canopies than sun-demanding species because of smaller amounts of non-photosynthetic structural nitrogen and/or supporting tissue in their leaves.