复羽叶栾树光合作用日变化及光响应特征  

Diurnal variation of photosynthesis and response to light intensity of Koelreuteria bipinnata

作　　者：张习敏[1] 申刚[1] 陈玲[1] 洪鲲[1] 张宇斌[1] 乙引[1] 

机构地区：[1]贵州师范大学生命科学学院/贵州省植物生理与发育调控重点实验室,贵州贵阳550001

出　　处：《广东农业科学》2015年第5期109-114,共6页Guangdong Agricultural Sciences

基　　金：贵州茅台科技联合基金(黔科合茅科联字[7006]号);贵州省重点实验室建设项目(黔科合计Z字[2011]4005号)

摘　　要：采用LI-6400便携式光合测定系统,测定贵州茅台酒厂生态功能区内复羽叶栾树光合作用日变化及光响应特征,并分析光合生理与生态因子之间的关系。结果表明:复羽叶栾树净光合速率(Pn)、光能利用率(LUE)的日变化均为单峰曲线,Pn和LUE的峰值分别出现在12:00和10:00左右;胞间二氧化碳浓度(Ci)的日变化与Pn相反,蒸腾速率(Tr)和气孔导度(Cond)的日变化均呈逐渐降低的趋势;Pn、Tr、LUE、Ci和Cond与主要环境因子光合有效辐射(PAR)、大气温度(Ta)和相对湿度(RH)之间的关系均符合二次曲线的变化规律,其中Pn、Tr与PAR、Ta、RH的相关程度均达极显著水平,Cond与PAR、Ta、RH的相关程度均达显著水平,LUE与PAR、Ta的相关程度均达极显著水平;PAR是影响复羽叶栾树Pn、Tr、Ci和Cond最主要的环境因子,LUE主要受Ta的影响。Diumal changes of photosynthesis and light response curve of Koelreuteria bipinnata were measured with LI-6400 in ecological function zones of Moutai winery, and the relationship between photosynthetic physiology and ecological factors were analyzed. The results showed that the net photosynthetic rate（Pn） and light use efficiency（LUE） of K. bipinnata had the diurnal variation of single peak, which appeared around 12：00 a.m. and 10：00 a.m.respectively. Intercellular CO2concentration（Ci） had opposite diurnal variation, compared with Pn. Diurnal variation of transpiration rate（Tr） and stomatal conductance（Cond） had gradual decrease on the whole day. The relationship among Pn, Tr, LUE, Ci, Cond and photosynthetical active radiation（PAR）, air temperature（Ta）, relative humidity（RH） had characteristics of quadratic curve model. There was a significant correlation between Pn, Tr and PAR, Ta, RH. A correlation between Cond and PAR, Ta, RH was observed. At the same time, a siginificant correlation between LUE and PAR, Ta was also observed. PAR was the most sensitive enrironmental factor to Pn, Tr, Ci and Cond of K.bipinnata and LUE was mainly effected by Ta.

关 键 词：复羽叶栾树 光合日变化 光响应 

分 类 号：S684[农业科学—观赏园艺]