【摘要】 用Licor-6400便携式光合作用测定系统测定了陕北吴旗县柠条在年生长季内叶片净光合速率随光照度和CO2浓度的变化规律,并测定了柠条叶片的蒸腾速率(Tr)和水分利用率(WUE)随光照度的变化规律。结果表明:在年生长季内,柠条叶片光补偿点(LCP)的变动范围为37.4~70.92μmol/(m2.s),光饱和点(LSP)为1 324.07~1 626.04μmol/(m2.s),表观光量子效率(φ)为0.008 99~0.014 76μmol/mol;柠条叶片的CO2补偿点(CCP)为56.76~126.80μmol/mol,CO2饱和点(CSP)为1 154.60~1 828.86μmol/mol。说明柠条为C3植物,不耐荫,应栽植在阳光充足的地方。柠条在年生长季内蒸腾速率(Tr)的大小排序为:Tr9月>Tr8月>Tr6月>Tr7月>Tr5月;水分利用率(WUE)高低排序为:WUE5月>WUE7月>WUE8月>WUE6月>WUE9月。更多还原

【Abstract】 By the Licor-6400 portable photosynthesis system,a field study on the photosynthetic characteristics in leaves of Caragana during different period was determined.The main results were as follows: the light compensation points(LCP) in leaves of Caragana plantation changed from 37.4 to 70.92 μmol/(m2·s) in different periods,the light saturation points(LSP) varied from 1 324.07 to 1 626.04 μmol/(m2·s) and the apparent photon utilization efficiency varied from 0.008 99 to 0.014 76 μmol/mol.The CO2 compensation point(CCP) of photosynthesis varied from 56.76 to 126.80 μmol/mol.The CO2 saturation points(CSP) varied from 1 154.60 to 1 828.86 μmol/mol.It is C3 plant that can’t shade tolerance.So it has to be planted on sunny fields.The Tr of Caragana plantation during different periods shows TrSept.>TrAug.>TrJun.>TrJul.>TrMay.;the WUE shows WUEMay.>WUEJul.>WUEAug.>WUEJun.>WUESept.更多还原