不同光照强度对三种藤本植物光合作用的影响  

Effects of Different Light Radiation Intensities on Photosynthesis of Three Vine Plants

作　　者：朱文杰 郑鸣洁 康瑜国 ZHU Wenjie;ZHENG Mingjie;KANG Yuguo(Shanghai Municipal Maintenance Management Company,Shanghai 201100)

机构地区：[1]上海市政养护管理有限公司,上海201100

出　　处：《中国农学通报》2022年第26期27-31,共5页Chinese Agricultural Science Bulletin

基　　金：上海市政养护管理有限公司技术公关项目“高速公路配套绿化建养关键技术研究”(SHSZ2020017)。

摘　　要：研究植物光合作用、气孔导度和蒸腾作用对光照强度的响应对于评价植物的光能和水分利用效率以及植物在不同光照条件下的生长具有重要意义。以3种藤本植物蔓长春花、西番莲和凌霄为实验对象,研究其在不同光强下的气体交换和叶绿素含量,并根据非直角双曲线模型估算其光合参数。结果显示,西番莲的光饱和点和最大净光合速率分别为1850μmol CO_(2)/(m^(2)·s)和10.9μmolCO_(2)/(m^(2)·s),明显高于其他2种植物。蔓长春花有较强的耐阴性,其光饱和点为580μmol/(m^(2)·s),明显低于其他2种植物,3种植物的表观量子效率并无明显差异,因此对弱光的利用能力相似。蔓长春花的叶绿素含量明显高于西番莲,但西番莲有相对较高的叶绿素a/b。西番莲有较宽的光适应范围,对弱光和强光的利用能力均较强,比蔓长春花和凌霄具有更强的光合能力。It is of great significance to study the responses of photosynthesis,stomatal conductance and transpiration of plants to photosynthetic active radiation,to evaluate the utilization efficiency of light energy and water and the plant growth under different light conditions.In the present study,three vine plants(Vinca major,Passiflora caerulea and Campsis grandiflora)were used to measure their gas exchange and chlorophyll content under different light levels.The photosynthetic parameters were estimated according to nonrectangular hyperbola model.The results showed that:the light saturated point and the maximum net photosynthetic rate of P.caerulea were 1850μmol CO_(2)/(m^(2)·s)and 10.9μmol CO_(2)/(m^(2)·s),respectively,significantly higher than those of V.major and C.grandiflora.V.major was strongly resistant to weak light with a lower light saturation point of 580μmol CO_(2)/(m^(2)·s),significantly lower than that of the other two plants.There was no significant difference in apparent quantum yield among the three plants,indicating they had similar ability to use weak light.The chlorophyll content of V.major was significantly higher than that of P.caerulea,but P.caerulea had a higher ratio of chlorophyll a/b than V.major.P.caerulea had a wide range of light adaptation and stronger utilization of low and high light.Therefore,the photosynthetic capacity of P.caerulea is higher than that of V.major and C.grandiflora.

关 键 词：最大净光合速率 光补偿点 光饱和点 表观量子效率 水分利用效率 

分 类 号：S687.3[农业科学—观赏园艺]