摘要
在温室条件下控制不同土壤水势梯度,从叶绿素含量、叶绿素 a 荧光、光合速率和蒸腾系数等方面,探讨水分胁迫下木麻黄苗木的光合作用和水分利用效率的变化。结果显示,供试木麻黄树种的光合作用呈现明显的日变化规律。在干旱胁迫情况下,随着叶水势的降低叶绿素总含量、叶绿素 a 荧光强度和水分利用效率先是增加而后降低,叶绿素 a/b 值和净光合速率则逐渐下降。
Based on the condition controlling soil water potential in the green house,the experiments were carried out within-photosythesis and water use efficiency of Casuarina species under the circumstance of wa- ter stress,by testing the indicators of chlorophyl content,chlorophyl A fluorescence,net photosynthesis rate and transpiration coefficient.The results showed that Casuarina species examined have clearly daily variation in photosynthesis.Under the condition of drought stress,total chlorophyl content,intensity of chlorophyl A fluorescence and water use efficiency increase first,then fall as water potential decrcase,but chlorophyl a/b and net photosynthesis rate drop gradually.
出处
《防护林科技》
2000年第S1期160-163,共4页
Protection Forest Science and Technology
基金
国家"九五"攻关专题(编号:96-007-03-6)
关键词
木麻黄
叶绿素
叶绿素a荧光
光合速率
水分利用效率
Casuarina species
chlorophyl
chlorophyl A fluorescence
photosynthesis rate
water use efficiency
