高光照强度下不同时间观光木光合生理特征对比  

Comparison of Photosynthetic Physiological Characteristics of Tsoongiodendron odorum at Different Time under High Light Intensity

作　　者：张应明[1] 吴林芳 栾福臣 王庭坚[1] 束祖飞 ZHANG Ying-ming;WU Lin-fang;LUAN Fu-chen(Guangdong Chebaling National Nature Reserve,Shaoguan,Guangdong 512500;Guangzhou Linfang Ecological Technology Co.,Ltd.,Guangzhou,Guangdong 510260)

机构地区：[1]广东车八岭国家级自然保护区,广东韶关512500 [2]广州林芳生态科技有限公司,广东广州510260

出　　处：《安徽农业科学》2019年第14期116-117,121,共3页Journal of Anhui Agricultural Sciences

基　　金：广东省极小种群野生植物资源救护项目(2016-33)

摘　　要：以车八岭自然保护区苗圃基地种植的观光木幼苗为材料,在固定光照强度[1000μmol/(m2·s)]的情况下,利用便携光合作用系统测定其在9:00、12:00和15:00这3个时间点的光合参数。结果表明,观光木的净光合速率、气孔导度、蒸腾速率等光合参数在上午最高,中午最低,有光合“午休”现象,而细胞间隙CO2浓度以及叶片温度则是在中午最高。推测温度升高影响了酶活性,造成了观光木的“午休”现象。The photosynthetic parameters were determined by using portable photosynthetic system under fixed light intensity [1 000 μmol/(m 2 ·s)] at 9:00,12:00 and 15:00.The results showed that the net photosynthetic rate,stomatal conductance and transpiration rate of sightseeing wood were the highest in the morning and the lowest at noon,with the phenomenon of photosynthesis midday depression,while the intercellular CO 2 concentration and leaf temperature were the highest at noon.Therefore,it can be speculated that the temperature rise affected the enzyme activity and caused the midday depression phenomenon of T.odorum .

关 键 词：观光木 光合生理特征 净光合速率 

分 类 号：S718.43[农业科学—林学]