绒毛胡枝子光合作用特性及其影响因子分析  

Photosynthetic Characteristics of Lespedeza tomentosa and Influencing Factors

作　　者：马彦军[1,2] 曹致中[1] 李毅[2] 

机构地区：[1]甘肃农业大学草业学院 [2]甘肃农业大学林学院,甘肃兰州730070

出　　处：《草地学报》2010年第2期183-187,共5页Acta Agrestia Sinica

基　　金：国家科技支撑计划项目(2006BAD04A-01);国家林业局重点科研项目(2006-35);甘肃省科技攻关项目(2GS064-A41-003-01)资助

摘　　要：于2009年7月以一年生绒毛胡枝子(Lespedeza tomentosa (Thunb.) Sieb. ex Maxim)为试材,利用英国生产的Lcpro+型便携式全自动光合测定系统对其光合作用日变化、光响应曲线进行测试,并对影响其光合作用的生理因子和环境因子进行相关性分析。结果表明:绒毛胡枝子净光合速率的日变化在夏季表现为双峰曲线,有光合"午休"现象,日平均光合速率为4.86μmol CO2.m-2.s-1。绒毛胡枝子的LCP约为57.61μmol.m-2.s-1,LSP约为1353.39μmol.m-2.s-1,显示出阳生植物特性,对环境适应能力强,适合在较大范围栽植。绒毛胡枝子光合速率与光合有效辐射、气孔导度以及空气相对湿度相关系数分别为0.431、0.534和0.487,达到极显著水平(P<0.01);与叶表面温度、蒸腾速率和大气二氧化碳浓度相关系数分别为0.104、0.242和0.182,达显著水平(P<0.05);与胞间二氧化碳浓度相关系数为-0.61,有极显著的负相关关系(P<0.01);与大气温度未有显著相关性(P<0.05)。Based on the experiment of diurnal photosynthetic variation and light response curve of 1-year Lespedeza tomentosa（Thunb.）Sieb.ex Maxim in summer,we analyzed the correlation between physiological and environmental factors which influence the photosynthesis significantly.The mean diurnal photosynthetic rate was 4.86 μmol CO2·m-2·s-1 and the light compensation points was 57.61 μmol·m-2·s-1.The photosynthetic rate had related coefficient of 0.431,0.534 and 0.487 between photosynthetic active radiation,stomatal conductance and relative air humidity respectively,there was obviously statistically difference（P〈0.01）.It had related coefficient of 0.104,0.242 and 0.182 between leaf surface temperature,transpiration rate and atmosphere carbon dioxide concentration respectively,which showed the significant level（P〈0.05）.It had evident negative relationship betwee intercellular carbon dioxide concentration with the related coefficient of-0.61.The results showed that diurnal net photosynthetic rate variation appears double-peak curve in the summer and there be ＂noon break＂.phenomenon in Lespedeza tomentosa（Thunb.）Sieb.ex Maxim

关 键 词：绒毛胡枝子 光合作用 日变化 影响因子 

分 类 号：Q494[生物学—生理学] Q945.11