Invasion of broad-leaf tree species into a larch plantation: seasonal light environment, photosynthesis and nitrogen allocation
Invasion of broad-leaf tree species into a larch plantation: seasonal light environment, photosynthesis and nitrogen allocation
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DOI：
10.1111/j.1399-3054.2004.00359.x
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发表时间：
2004-08-01
影响因子：
6.4
通讯作者：
Koike, T
中科院分区：
文献类型：
--
作者：
Kitaoka, S;Koike, T
我们研究了具有不同叶子物候性状的树苗如何在季节性变化的光照环境中改变其氮分配。具体来说，我们研究了原位最大叶片光合速率的季节变化，以及氮、叶绿素和核酮糖-1,5-二磷酸羧化酶加氧酶 (Rubisco) 含量的变化。我们还估计了落叶松人工林中生长的四种连续树种从叶氮到光合蛋白、光捕获蛋白和其他蛋白质的氮分配特征。间隙期物种 Magnolia hyperreuca Siebold et Zucc. 表现出较高的光合速率，以补偿较短的叶期，并向 Rubisco 分配更多的氮。相比之下，生长在森林地面的树种，Prunus ssiori F. Schmidt 和 Carpinus cordata Blume，利用树冠树木的无叶期，根据树冠关闭改变氮从 Rubisco 到叶绿素的分配。蒙古栎 Fischer ex Ledeb。变种Crisula (Blume) Ohashi 是一种中期演替树种，由于向 Rubisco 分配更多的氮，因此在 9 月保持较高的光合速率。我们得出的结论是，幼苗的物候差异清楚地反映在落叶松人工林间隙和森林地面的氮分配模式中。
We have studied how tree seedlings with differing leaf phenological traits change their nitrogen allocation in seasonally changing light environments. Specifically, we have investigated seasonal changes in maximum leaf photosynthetic rates in situ, and changes in nitrogen, chlorophyll and ribulose-1,5-bisphosphate carboxylase oxygenase (Rubisco) content. We have also estimated nitrogen allocation characteristics from leaf nitrogen to photosynthetic proteins, light-harvesting protein and other proteins in four successional tree species growing in a larch plantation. The gap phase species, Magnolia hyporeuca Siebold et Zucc., displays higher photosynthetic rates to compensate for the short leafy period and allocates more nitrogen to Rubisco. In contrast, tree species that grow at the forest floor, Prunus ssiori F. Schmidt and Carpinus cordata Blume, use the leafless period of the canopy trees to change their allocation of nitrogen from Rubisco to chlorophyll in line with canopy closure. Quercus mongolica Fischer ex Ledeb. var. crispula (Blume) Ohashi is a mid-successional tree species, and maintains a high photosynthetic rate in September because it allocates more nitrogen to Rubisco. We conclude that phenological differences in tree seedlings are clearly reflected in the nitrogen allocation pattern at gaps and at the forest floor in larch plantations.