7种针阔叶树种不同光照强度下叶绿素荧光猝灭特征  

Chlorophyll Fluorescence Quenching Characteristics of Seven Coniferous and Broadleaved Species in Different Light Intensities

作　　者：何炎红[1] 郭连生[1] 田有亮[1] 

机构地区：[1]内蒙古农业大学林学院,呼和浩特010019

出　　处：《林业科学》2006年第2期27-31,共5页Scientia Silvae Sinicae

基　　金：国家自然科学基金项目(30160071)。

摘　　要：在半干旱地带的呼和浩特地区使用LI-COR光合测定系统研究了8～11年生油松、新疆杨、侧柏、白榆、沙棘、美国红梣、白杄7种针阔叶树种不同光照强度下叶绿素荧光猝灭特征,结果表明:光化学猝灭(qP)和非光化学猝灭(NPQ)随光强度的变化规律可拟合为y=a+b[1-EXP(-cx)](式中:x为光强,y为qP或NPQ);qP与NPQ呈直线性负相关。NPQ光响应曲线转折点可作为光抑制初始点,该点对应的光强度可作为评价不同树木抵御光胁迫伤害能力和对强光适应能力的指标;NPQ转折点光强度愈大抵御光胁迫伤害能力愈大,对强光的适应能力愈强。测试树种对强光的适应能力由小到大的排序为:白杄、沙棘、美国红梣、侧柏、油松、新疆杨、白榆。The change of chlorophyll fluorescence quenching characteristics in leaves of 8 ～ 11 years old of seven coniferous and broadleaved species was measured in different light intensities by a LI-COR photosynthesis system. The results showed that the changing patterns of photochemistry quenching （ qp ） and non-photochemistry quenching （ NPQ ） could be expressed by equation y = a ＋ b[1 - EXP（ - cx）] （x： light intensity; y： qp or NPQ）. qp was negative relation with NPQ. It was suggested that the turning point of NPQ - light response curve could be regarded as the initial point of photoinhibiton, and the corresponding light intensity could be re.garded as an index for estimating the capability against photoinhibition and the adaptability for strong light. The greater value of turning point stood for the higher capacity against strong light damage. The order of the adaptability to strong light from weak to strong among seven species was Picea meyeri, Hippophae rhamnoides, Fraxinus pennsylvanica, Platycladus orientalis, Pinus tabulaeformis, Populus alba cv. pyramidalis, Ulmus pumila.

关 键 词：针阔叶树种 叶绿素荧光猝灭 光抑制 回归方程 

分 类 号：S718.43[农业科学—林学]