红树植物老鼠簕的光合特性及光响应曲线模型  

Photosynthetic Properties and Light Response Curve Models of Mangrove Acanthus ilicifolius

作　　者：林明伟 陈荣强 吴志华 LIN Mingwei;CHEN Rongqiang;WU Zhihua(Administration Bureau of Zhanjiang Mangrove National Nature Reserve,Zhanjiang 524049,Guangdong,China;Research Institute of Fast-growing Trees,Chinese Academy of Forestry,Zhanjiang 524022,Guangdong,China)

机构地区：[1]广东湛江红树林国家级自然保护区管理局,广东湛江524094 [2]中国林业科学研究院速生树木研究所,广东湛江524022

出　　处：《桉树科技》2022年第4期43-50,共8页Eucalypt Science & Technology

基　　金：广东省重点领域研发计划资助项目(2020B020214001-ZKT03);中央级公益性科研院所基本科研业务费专项资金(CAFYBB2022MA005)。

摘　　要：光响应曲线反映了植物对光能利用的特性。本研究采用6种光合响应模型对红树植物老鼠簕嫩叶和成熟叶进行光合曲线拟合并对其光合特性进行评估。结果发现所有的模型决定系数均在0.9以上,均能很好地解释光响应。不同叶龄叶片对模型拟合影响显著,而模型之间在决定系数R2、RSS差异程度较小。非直角双曲线模型适合拟合老鼠簕光合-光响应曲线的模型,利用此模型可有效地对老鼠簕利用效率进行评价。老鼠簕嫩叶和成熟叶光响应曲线模型以及光合特性方面均存在差别,在非直角双曲线模型中,其成熟叶的最大光合速率6.191μmol·m-2·s-1显著高于嫩叶最大光合速率为3.247μmol·m^(-2)·s^(-1),成熟叶相对嫩叶来说更具有强的光环境适应能力。相关分析表明:光照强度(PAR)与光合速率(Pr)、水气压差(VpdL)和水分利用效率(WUE)具有强的相关性,光合速率(Pr)与胞间CO_(2)浓度(Ci)呈显著负相关,而与蒸腾速率(Tr)、气孔导度(Cond)呈显著正相关(P<0.01),气孔导度是限制光合速率的重要因子。Light response curves can reflect the characteristics of light energy utilization by plants.In this study,six models of light response curves were used to fit the photosynthetic curves of young and mature leaves of Acanthus ilicifolius.These fitted models were used to assess photosynthetic properties of this species,and all six models had coefficients of determination above 0.9,which could well explain responses of its leaves to light.Differences among young leaves and mature leaves had significant effects on the model fitting,while the difference between various models as judged by R-squared(R2,coefficient of determination)and RSS(residual sum of squares)were small.The non-rectangular hyperbolic model was suitable for fitting the light response curves of A.ilicifolius,and this could be used for evaluating the efficiency of A.ilicifolius in utilizing light.With this model,the maximum photosynthetic rate was estimated to be 6.191μmol·m^(-2)·s^(-1) in mature leaves and this was significantly higher than that of 3.247μmol·m^(-2)·s^(-1) in young leaves.Correlation analysis showed that light intensity(PAR)was strongly correlated with Pr(photosynthetic rate),VpdL(vapor pressure deficit based on leaf temperature),and WUE(water use efficiency),and Pr was strongly negatively correlated with Ci(intercellular CO_(2) concentration),while it was strongly positively correlated with Tr(transpiration rate)and Cond(Stomatal conductance)with significant differences(P<0.01).Cond was an important factor in limiting photosynthetic rate.

关 键 词：老鼠簕 光合特征 光合响应曲线模型 最大光合速率 

分 类 号：S718.43[农业科学—林学]