摘要
在实验室砾耕栽培条件下,根据在培养液中加入PEG调节溶液渗透势,设置对照区、弱干旱胁迫区、强干旱胁迫区3种处理(培养液渗透势分别为0 0,-0 1,-0 3MPa),测定臭柏的光合速率及其生态因子的日变化和季节变化,分析臭柏的光合速率与气温、叶温、相对湿度、光照强度的关系,结果表明:(1)臭柏的光合速率对生态因子的适应范围随着干旱胁迫程度的不同而变化,干旱胁迫加大了温度胁迫的影响范围,降低了光能利用率;增加大气相对湿度,可以减轻干旱胁迫效应;(2)各个生态因子从大到小对光合速率影响的顺序依次为光照强度、相对湿度、叶温、气温;(3)干旱胁迫处理对光合速率的影响大小依次为强干旱胁迫区、弱干旱胁迫区、对照区。
In order to discuss the mechanism of drought resistance of Sabina vulgaris,three treatments of control, light drought stress,strong drought stress were set up in water culture system in greenhouse,and diurnal change and seasonal change of photosynthetic rate and ecological factors of S.vulgaris were measured,its relationship were studied under drought stress. The results were showed as follows:(1)Adaptive scope of net photosynthetic rate of S.vulgaris to temperature was difference,scope of temperature stress was enlarge,Fv/Fm was increased under drought stress. Increasing of relative humidity could lighten drought stress.(2)The Gray sequence of four ecological factors to net photosynthetic rate was PARi>RH RH>Tleaf>Tair.(3)The Gray sequence of three treatments to net photosynthetic rate was strong drought stress> light drought stress>control.Sensitiveness of net photosynthetic rate of S.vulgaris to change of ecological factors increased under drought stress.
出处
《福建林学院学报》
CSCD
北大核心
2004年第3期206-210,共5页
Journal of Fujian College of Forestry
基金
国家自然科学基金资助项目(30240033)
浙江林学院科学研究发展基金资助项目(200208)
关键词
干旱胁迫
臭柏
光合速率
生态因子
关联分析
drought stress
Sabina vulgaris
photosynthetic rate
ecological factors
gray sequence
