摘要
研究了遮光15%、35%、50%和全光照处理对青榨槭新梢生长、叶片色素含量、净光合速率以及叶绿素荧光参数的影响。结果表明,随着遮光度增加,叶片色素含量增加,叶绿素a/b减小;叶片净光合速率(Pn)、初始荧光(Fo)、原初光能转化效率(Fv/Fm)和光化学猝灭系数(qP)增加,但非光化学猝灭系数(qN)降低。全光照和遮光15%处理条件下,Pn日变化呈双峰曲线,而35%和50%处理条件下呈单峰曲线;遮光35%和50%处理条件下Fv/Fm日变化幅度较小,15%和全光照处理条件下Fv/Fm日变化呈先上升后下降再上升趋势。50%遮光处理青榨槭幼苗Pn最高,新梢年生长量最大,可在育苗生产中应用。
The shoot growth and the pigment content, net photosynthetic rate, transpiration rate and chlorophyll fluorescence of leaf under different shading treatments （0%, 15% , 35% and 50% ） were investigated in david maple seeding. The results showed that the pigment content, net photosynthetic rate, minimal fluorescence （Fo）, conversion efficiency of primary light energy （Fv/Fm） of PS Ⅱ and photochemical quenching coefficient （qP） were enhanced, but the non-photochemical quenching coefficient （qN） was decreased as shading increased. The diurnal variation curve of net photosynthetic rate had two peaks under 0% and 15% shading treatments, while there was only one peak under 35% and 50% shading treatments. The diurnal variations of Fv/Fm showed increase-decrease-increase curve under 0% and 15% shading treatments, and kept stable in 35% and 50% shading treatments. It is concluded that 50% shading suitable for the growth of david maple seedlings.
出处
《园艺学报》
CAS
CSCD
北大核心
2007年第1期173-178,共6页
Acta Horticulturae Sinica
基金
河北省林业局资助项目(0406260)
关键词
青榨槭
遮光
色素
光合作用
叶绿素荧光
David maple
Shading
Pigment
Photosynthesis
Chlorophyll fluorescence
