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作 者:莫凌[1] 黄玉清[1] 桂堂辉[1,2] 黎彦余[1,2]
机构地区:[1]广西壮族自治区中国科学院广西植物研究所,广西桂林541006 [2]广西师范大学生命科学学院,广西桂林541004
出 处:《草业科学》2010年第9期64-68,共5页Pratacultural Science
基 金:广西科技攻关项目(桂科合0630004-7A-22);国家科技支撑计划项目(2006BAC01A10);桂林市科学研究与技术开发计划项目(20090111-2);广西科技攻关项目(桂科攻0816003-1-8);所控项目(桂植业09026)
摘 要:在桂林地区采用Li-6400便携式光合测定系统测定5个热带禾本科牧草品种的净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、水分利用效率(WUE)等生理特性指标。结果显示:1)5个牧草品种的Pn、Tr和Gs均随PAR增强而增大,WUE随PAR增强先增大后减小,除桂牧一号[(Pennisetum purpureum cv. Mott)×(P.americanum×P.purureum)]cv. Guimu No.1在PAR为1 500μmol/(m2.s)时达到最大值外,其余均在PAR为600μmol/(m2.s)时达到最大值。2)3个杂交品种的最大光合速率(Amax)与光饱和点(LSP)均显著高于2个雀稗品种(P<0.05),最大Pn和Tr均高于2个雀稗属品种。研究表明:5个热带牧草品种均能很好的适应当地的环境。Photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs) and water use efficiency(WUE) of 5 tropical forage cultivars were measured by using LI-6400 portable photosynthesis system in Guilin.The results were as follows:1) The Pn,Tr and Gs of the five cultivars were increased with the enhancement of the PAR,and the WUE of the 5 cultivars were firstly increased and then decreased as the PAR was gradually enhanced.Guimu No.1(Pennisetum purpureum cv.Mott) ×(P.americanum × P.purureum) reached the maximum WUE at 1 500 μmol/(m2·s) while the others at 600 μmol/(m2·s).2) The maximum photosynthetic rate(Amax) and the light saturation point(LSP) of 3 hybrid cultivars were significantly higher than that of the two Paspalum cultivars,and it was same for net Pn and Tr.It could be concluded that the tested 5 cultivars were well adapted to the local environment.
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