山椒子光合特性日变化与其环境因子的相关性分析  

Diurnal photosynthetic characteristics of Uvaria grandiflora Roxb. and its correlation with environmental factors

作　　者：杨浩 韩维栋[1] 高秀梅[1] YANG Hao;HAN Weidong;GAO Xiumei(Agricultural College of Guangdong Ocean University,Zhanjiang Guangdong 524088,China)

机构地区：[1]广东海洋大学农学院

出　　处：《生态科学》2019年第6期92-97,共6页Ecological Science

基　　金：国家自然科学基金项目(No.31170511);广东海洋大学人才团队项目(530002001130)

摘　　要：为探明山椒子光合速率变化规律及其与环境因子的关系,使用LCi-SD便携式光合仪测定三年生山椒子叶片的净光合速率(Pn)、蒸腾速率(Tr、X1)、光合有效辐射(PAR、X2)、空气CO2浓度(Ca、X3)、叶片温度(Tl、X4)、空气相对湿度(RH、X5)、胞间CO2浓度(Ci、X6)、气孔导度(Gs、X7)的日变化进程。结果表明:山椒子Pn日变化曲线为“双峰型”并存在明显的“光合午休”现象,且主要由气孔限制因素引起;利用多元线性逐步回归求得山椒子Pn的最优回归方程为:Y=-8.474+1.819X1-0.016X6+0.048X5+0.023X3(R^2=0.988,复相关系数R=0.994,标准估计误差Se=0.203,F值=159.020,P<0.001);通径分析结果表明,影响山椒子Pn变化的主要因子是Tr、Ci、RH、Ca,且各主要因子影响的直接效应顺序为Ci>Tr>Ca>RH,总效应顺序为Tr>Ci>Ca>RH。In order to study the diurnal photosynthetic characteristics of Uvaria grandiflora Roxb.and it relationships with environmental factors,the diurnal variations of net photosynthetic rate(Pn),transpiration rate(Tr,X1),photosynthetically active radiation(PAR,X2),air CO2 concentration(Ca,X3),leaf temperature(Tl,X4),air relative humidity(RH,X5),intercellular CO2 concentration(Ci,X6),stomatal conductance(Gs,X7)of 3-year-old Uvaria grandiflora Roxb.were determined by using LCi-SD portable photosynthesis system.The results showed that the diurnal curves of Pn belonged to“the double peaks pattern”with an obvious decline of Pn at noon and the midday depression of Pn was mainly influenced by the stomatal factors.The optimal regression equation of Pn was obtained by using multiple linear stepwise regression:Y=-8.474+1.819X1-0.016X6+0.048X5+0.023X3(R^2=0.988,R=0.994,Se=0.203,F=159.020,P<0.001).The path analysis showed that the diurnal variations of Pn had significant correlations with Tr,Ci,RH,Ca and the direct effect order was Ci>Tr>Ca>RH;the total effect order was Tr>Ci>Ca>RH.

关 键 词：山椒子 光合特性 环境因子 相关性分析 

分 类 号：S718.43[农业科学—林学]