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.
出处
《草业科学》
CAS
CSCD
北大核心
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)
关键词
热带禾本科牧草
光合特性
光响应
tropical forages
photosynthetic characteristics
light response
