高地省藤幼苗光合作用日变化特征  

Diurnal Variations in Photosynthesis of Calamus nambariensis var. alpinus at Seedling Stage

作　　者：官凤英[1] 范少辉[1] 刘亚迪[1] 邓旺华[1] 彭颖[1] 

机构地区：[1]国际竹藤网络中心竹藤科学与技术重点实验室生物资源利用科学研究院,北京100102

出　　处：《浙江林业科技》2010年第5期33-37,共5页Journal of Zhejiang Forestry Science and Technology

基　　金：林业科学技术推广项目"棕榈藤种质资源培育及利用技术推广与示范"(〔2005〕86);国际竹藤网络中心科研专项"优质棕榈藤苗期生长及光合作用研究"(06/07-B18)

摘　　要：利用Li-6400便携式光合测定仪研究了高地省藤苗期光合作用日变化特征,结果表明:①高地省藤5个月幼苗Pn、Tr日变化曲线均呈双峰型,12:00左右出现明显的光合"午休"现象,峰值出现在10:00和14:00左右,"午休"过后,气孔扩张,且蒸腾增加量高于Pn增加量;②水分利用效率WUE和气孔限制值Ls也呈双峰趋势,在10:00均达最大值,WUE光合"午休"时降至最低,16:00出现次高峰,Ls变化较WUE平缓,光合"午休"时略有下降,18:00时降到最低值;③相关性分析结果表明:对Pn影响最大的因子是Ls,其次是Gs、WUE、Tr、RH、PAR、VPD、Ca、Ta,这些因子与Pn均呈正相关,但均未达到显著水平,高地省藤光合速率变化是多因素综合作用的结果。Diurnal variation in photosynthesis of Calamus nambariensis var. alpinus at seedling stage was studied by Licor-6400 portable photosynthetic system. The results demonstrated that 5-month C. nambariensis var. alpinus seedling had an obvious double peaks curve of diurnal variation both in net photosynthesis rate（Pn） and transpiration rate（Tr） with obvious midday depression at 12 and the peak value appeared at 10 to 14. For the reason of the stretch of stoma, the increment of Tr was higher than that of Pn after the midday depression. The diurnal variation trend of water use efficiency（WUE） and stomatal limitation value（Ls） were also double peaked with the peake at 10. WUE reached the second peak at 16. The changing trend of Ls was lower than that of WUE and got the lowest value at 18. Correlation analysis resulted that Pn had relationships with many environmental factors but not a significant level. The influencing factors to Pn were ordered as follows： LsGsWUETrRHPARVPDCaTa.

关 键 词：高地省藤 净光合速率 日变化 光合“午休” 

分 类 号：S718.45[农业科学—林学]