The Influence of Previous Irradiance on Photosynthetic Induction in Three Species Grown in the Gap and Understory of a Fagus Crenata Forest
The Influence of Previous Irradiance on Photosynthetic Induction in Three Species Grown in the Gap and Understory of a Fagus Crenata Forest
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先前辐照度对水青冈林隙和林下三种植物光合诱导的影响
DOI：
10.1023/a:1015652011994
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发表时间：
2001
期刊：
影响因子：
2.7
通讯作者：
Y. Kakubari
中科院分区：
文献类型：
--
作者：
M. Naramoto;Q. Han;Y. Kakubari
研究了毛根山毛榉（Fagus crenata）、红脉槭（Acer rufinerveSiebold & Zucc.）叶片对低背景光量子通量密度（PPFD）（0、25、50和100 μmol m − 2s − 1）突然增加到1000 μmol m−2s− 1时的光合诱导反应。和叉荚（Viburnum furcatum）生长在苗场山一个毛茛林的林隙和林下。在差距中，A. Rufinerve的最大净光合速率（PNmax）是F的1.2倍以上。锯齿形V.分叉同时，在地下F.在三种植物中，钝齿藻的PNmax最高。达到PNmax所需的光合诱导期为3-41 min，PPFD增加的光合响应取决于PPFD增加前的背景PPFD。当PPFD从黑暗中增加时，达到PNmax所需的诱导期比PPFD从100 μmol m−2s−1增加时长2.5-6.5倍。诱导期与初始PN和气孔导度（GS）相对于PPFD增加前的最大值相关。差距与林下植被的关系相似。随着背景PPFD的增加，初始Pn和gs增加，表明生物化学和气孔对动态光合性能的限制程度降低。因此，随着背景PPFD的增加，光合诱导对PPFD增加的响应变得更快。在相同的PPFD背景下，不同树种、不同林窗和林下植物达到诱导所需时间的差异主要是由于PNandgs中相对初始诱导状态的不同。
Photosynthetic induction responses to a sudden increase in photosynthetic photon flux density (PPFD) from lower background PPFD (0, 25, 50, and 100 μmol m−2s−1) to 1 000 μmol m−2s−1were measured in leaves ofFagus crenata, Acer rufinerveSiebold & Zucc., andViburnum furcatumgrowing in a gap and understory of aF. crenataforest in the Naeba mountains. In the gap,A. rufinerveexhibited more than 1.2-fold higher maximum net photosynthetic rate (PNmax) thanF. crenataandV. furcatum. Meanwhile, in the understoryF. crenataexhibited the highestPNmaxamong the three species. The photosynthetic induction period required to reachPNmaxwas 3–41 min. The photosynthetic responses to increase in PPFD depended on the background PPFD before increase in PPFD. The induction period required to reachPNmaxwas 2.5–6.5-fold longer when PPFD increased from darkness than when PPFD increased from 100 μmol m−2s−1. The induction period was correlated with initialPNand stomatal conductance (gs) relative to maximum values before increase in PPFD. The relationship was similar between the gap and the understory. As the background PPFD increased, the initialPNandgsincreased, indicating that the degrees of biochemical and stomata limitations to dynamic photosynthetic performance decreased. Therefore, photosynthetic induction responses to increase in PPFD became faster with the increasing background PPFD. The differences in time required to reach induction between species, as well as between gap and understory, were mainly due to the varying of relative initial induction states inPNandgsat the same background PPFD.