Utilization of lightflecks by seedlings of five dominant tree species of different subtropical forest successional stages under low-light growth conditions.
Utilization of lightflecks by seedlings of five dominant tree species of different subtropical forest successional stages under low-light growth conditions.
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DOI：
10.1093/treephys/tps043
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发表时间：
2012-05
期刊：
影响因子：
4
通讯作者：
Q. Zhang;Y. J. Chen;L. Song;N. Liu;L. L. Sun-L.;C. Peng
中科院分区：
文献类型：
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作者：
Q. Zhang;Y. J. Chen;L. Song;N. Liu;L. L. Sun-L.;C. Peng
选取了5个典型树种，包括1个早期演替树种（ES）马尾松（Pinus Massoniana Lamb.），2个中期演替树种（MS）木荷（Schima Fewba Gardn）。等冠军。和 Castanopsis fissa (Champ. ex Benth.) Rehd。等威尔斯。和两个晚演替种 (LS) Cryptocarya concinna Hance。 Acmena acuminatissima (BI.) Merr et Perry. 和 Acmena acuminatissima (BI.) Merr et Perry. 代表了中国南方鼎湖山亚热带森林演替中三个演替时期的植物。 5个品种的盆栽幼苗在12%的全日照条件下生长36个月。 ES 和 MS 分别显示出对光斑的最慢和最快的响应，这与气孔打开的速率相关。与马尾松和 C. concinna 相比，其他三个物种表现出较高的诱导损失。早期演替物种表现出最低的比叶面积和叶绿素含量、最高的光合能力（A（max））和呼吸碳损失（R（d））。与ES和MS相比，LS显示出较低的A(max)和R(d)。这五种树种在长期低光适应后表现出相似的叶绿素 a/b 比率。另一方面，LS 具有相对较高的脱环氧化状态，以保护自己在光斑期间免受过多的光照。我们的结果表明，（i）对光斑的反应较慢可以部分解释为什么 ES 物种无法在弱光条件下实现幼苗再生； (ii) 对光斑的快速响应可以部分解释为什么 MS 物种可以在弱光条件下实现幼苗再生； (iii) 较小的呼吸碳损失可能赋予 LS 物种在弱光条件下的竞争优势。
We selected five typical tree species, including one early-successional species (ES) Pinus massoniana Lamb., two mid-successional species (MS) Schima superba Gardn. et Champ. and Castanopsis fissa (Champ. ex Benth.) Rehd. et Wils. and two late-successional species (LS) Cryptocarya concinna Hance. and Acmena acuminatissima (BI.) Merr et Perry., which represent the plants at three successional periods in Dinghushan subtropical forest succession of southern China. Potted seedlings of the five species were grown under 12% of full sunlight for 36 months. The ES and MS showed the slowest and fastest responses to lightflecks, respectively, which correlated with the rate of stomatal opening. In contrast to P. massoniana and C. concinna, the other three species exhibited a high induction loss. Early-successional species showed the lowest specific leaf area and chlorophyll content, the highest photosynthetic capacity (A(max)) and respiratory carbon losses (R(d)). Compared with ES and MS, LS showed lower A(max) and R(d). The five tree species showed a similar chlorophyll a/b ratio after long-term low-light adaptations. On the other hand, LS had a relatively higher de-epoxidation state to protect themselves from excess light during lightflecks. Our results indicated that (i) slower responses to lightflecks could partially explain why ES species could not achieve seedling regeneration in low-light conditions; (ii) fast responses to lightflecks could partially explain why MS species could achieve seedling regeneration in low-light conditions; and (iii) smaller respiratory carbon losses might confer on the LS species a competitive advantage in low-light conditions.