3种禾本科牧草光合特性研究  

Photosynthetic characteristics of three forage grasses

作　　者：马鸣[1] 王宗礼[2] 张德罡[1] 

机构地区：[1]甘肃农业大学草业学院,甘肃兰州730070 [2]中国农业科学院草原研究所,内蒙古呼和浩特010010

出　　处：《草原与草坪》2008年第5期48-50,55,共4页Grassland and Turf

基　　金：国家"十一五"科技支撑项目(2006BAD16B03);公益性行业(农业)科研专项经费项目(ny-hyzx07-022);"948"项目(2006-G38)资助

摘　　要：在田间测定了生长2年的野大麦,直穗鹅观草和垂穗披碱草的光合特性,并采用相关系数分析了影响3种禾本科牧草光合特性日变化的主要因子。结果表明:(1)3种禾本科牧草的净光合速率日变化均呈双峰型,野大麦的第1峰值出现在8∶00,直穗鹅观草和垂穗披碱草的第1峰值出现在10∶00,野大麦的第2峰值出现在14∶00,直穗鹅观草和垂穗披碱草的第2峰值出现在16∶00;(2)野大麦在12∶00有明显的光合"午休"现象,直穗鹅观草和垂穗披碱草的光合"午休"现象出现在13∶00;(3)3种禾本科牧草的净光合速率日变化的主要影响因子不同,影响野大麦和垂穗披碱草的净光合速率日变化的主要因子是气孔导度,而影响直穗鹅观草净光合速率日变化的主要因子是胞间CO2浓度。The diurnal dynamics of photosynthetic rate （Pn） and transpiration rate（Tr）of two years planted forage grasses under suit environment condition,as well as those of photosynthetic active radiation （PAR）,CO2 concentration in field（Ca）,relative humidity（RH）and air temperature（Ta）were measured, and the relationships between the diurnal dynamics of Pn and leading factors were analyzed by correlation coefficient. The results obtained as follows： （1）The diurnal dynamics of photosynthetic rate （P,） of the three species exhibited a twin- peaked pattern. The first apex of Hodeum brevisubulaturn appeared at 8 ： 00, but the first apex of Elyraus nutans and Roegneria turczaninovii appeared at 10 ： 00. The second apex of Hodeum brevisubulatum appeared at 14 ： 00,Roegneria turczaninovii and Elymus nutans appeared at 16 ： 00;（2）There was noon depression of photosynthesis for Hodeum brevisubulaturn at 12 ： 00. Noon depression of photosynthesis for Roegneria turczaninovii and Elyrnus nutans appeared 13 ： 00;（3）For the characteristics of photosynthesis of Hodeum brevisubulatum and Elyrnus nutans Gs was the leading factor,while Ci had the greatest effect on the characteristics of photosynthesis of Roegneria turczaninovii.

关 键 词：野大麦 直穗鹅观草 垂穗披碱草 光合特性 

分 类 号：Q945.11[生物学—植物学] S54[农业科学—作物学]