光照和氮营养对水曲柳苗木光合特性的影响  

Effects of light intensity and nitrogen supply on photosynthetic characters of Fraxinus mandshurica seedlings

作　　者：霍常富[1] 孙海龙[1] 王政权[1] 范志强[1] 赵晓敏[1] 

机构地区：[1]东北林业大学林学院,哈尔滨150040

出　　处：《生态学杂志》2008年第8期1255-1261,共7页Chinese Journal of Ecology

基　　金：国家"十一五"科技支撑计划项目(2006BAD24B0802);博士学科点专项基金资助项目(20050225009)

摘　　要：采用室内沙培方式,设计不同光强(2水平)和N浓度(4水平)处理,探讨1年生水曲柳幼苗叶片光合速率和荧光参数对环境变化的生理响应。结果表明:与全光照相比,遮光处理使苗木叶片最大光合速率(Amax)、光补偿点(LCP)以及光化学猝灭系数(qP)明显下降,但使表观量子效率(AQY)、最大荧光(Fm)和最大光化学效率(Fv/Fm)明显增加。同时,苗木叶片单位面积的叶绿素a、类胡萝卜素、总叶绿素含量以及叶绿素a/b在遮光条件下较低。2种光强下的Fm、Fv/Fm、φPSⅡ和qP均随着供N浓度的增加而显著增加(P<0.05),其中φPSⅡ在低N时增加较快而高N时较慢,甚至略有下降。光强和N浓度在水曲柳苗木叶片Fm、φPSⅡ、Fv/Fm、qN以及qP上均具有显著的交互作用(P<0.05)。One-year old Fraxinus mandshurica seedlings were sand-cultured and subjected to different light intensity （2 levels） and N supply （4 levels） to examine their photosynthetic rate and chlorophyll fluorescence response to environmental change. The results showed that comparing with full light, shading decreased the maximum photosynthesis rate （Amax ）, light compensation point （LCP） and photochemical quenching coefficient （qP） obviously, while increased the ap- parent quantum yield （AQY）, maximum fluorescence （Fm） and maximal photochemical efficiency （Fv/Fm） markedly. The total chlorophyll, chlorophyll a and carotenoid contents and chlorophyll a/b per unit area of leaf were lower under shading. At two light levels, the Fm, Fv/Fm, ψPSⅡ and qP increased with increasing N supply （P 〈 0. 05 ）, and ψPSⅡ increased more quickly at lower N levels than at higher N levels. Light intensity and N supply had a Significant interaction on the Fm,ψPSⅡ, Fv/Fm, qN and qP （P〈0.01）.

关 键 词：水曲柳 光强 氮浓度 光合特性 叶绿素荧光 

分 类 号：Q945[生物学—植物学] S792.41[农业科学—林木遗传育种]