不同人工光环境对南方红豆杉幼树观赏性状及树冠表型可塑性研究

为了探索人工方法重塑观赏型南方红豆杉，在福建明溪进行不同人工光环境下南方红豆杉的形态学特征及观赏性状试验，对其植株高度、地径、树冠园满度、枝叶浓密度、分枝情况进行分析比较。结果表明，植株形态及观赏性状在不同人工光环境条件下存在显著性可塑性变化。全光照较长期遮荫可以显著性提高树冠园满度、枝叶浓密度、2、3级枝数量及均长和总体分枝率；长期遮荫促进植株高度、地径和1级侧枝萌发，植株叶色明显更为浓绿，但显著性减少1级侧枝长度。南方红豆杉为适应不同人工光环境，在形态方面都做出适应性调整。人为改变植物生长的光环境可以改变植株形态，是人工重塑观赏型南方红豆杉的一个重要的措施。

Study on Morphological Plasticity and Ornamental Traits of Landscape Type Taxus chinensis var. mairei. Under Different Artificial Light Condition

In order to explore the use of artificial methods to reshape landscape type Taxus chinensis var. mairei. The morphologyical characters and ornamental traits of landscape type Taxus chinensis var. mairei. under different artificial light environment were studied in Mingxi, Fujia. The author analyzed and compared plant height, ground diameter, CFR, the foliage dense degree, lateral branch germination. The results showed that: morphologyical characters and ornamental traits were modified plastically in response to different artificial light conditions. The full sunlight condition than the long-term shade condition significantly increased CFR, the foliage dense degree, the number and the average length of the 2,3-order lateral branches, the overall branching rate; the long-term shade condition than the full sunlight condition significantly increased plant height, ground diameter, the first-order lateral branch germination, leaves significantly more dark green, but significantly reduced first-order lateral branch length. These indicated that: Taxus chinensis var. mairei. made some necessary changes in morphological aspects in order to accommodate it to the change of light environment. Anthropogenic changes plant growth light environment could change plant morphology, was an important measure of artificial reshaping landscape type Taxus chinensis var. mairei.