4种光响应模型对不同灌水量下胡杨光合–CO_(2)响应过程的模拟效果  

Simulation effect of four light response models on the photosynthetic CO_(2) response process of Populus poplar under different irrigation volumes

作　　者：陈跃萍 武胜利[1,2] 史智欣 岳永江 何宇翔 CHEN Yueping;WU Shengli;SHI Zhixin;YUE Yongjiang;HE Yuxiang(School of Geographical Science and Tourism,Xinjiang Normal University,Urumqi,Xinjiang 830054,China;Xinjiang Key Laboratory of Lake Environment and Resources in Arid Areas,Urumqi,Xinjiang 830054,China)

机构地区：[1]新疆师范大学地理科学与旅游学院,新疆乌鲁木齐830054 [2]新疆干旱区湖泊环境与资源重点实验室,新疆乌鲁木齐830054

出　　处：《湖南农业大学学报（自然科学版）》2023年第3期313-320,共8页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：新疆维吾尔自治区科技支撑专项(HY–2.3)。

摘　　要：以3、5、7 a生胡杨为试验材料,设置4种灌水量处理,CK(无灌水量)、T1(每株每次灌水20 kg)、T2(每株每次灌水40 kg)、T3(每株每次灌水60 kg),每株灌水6次,采用Li–6400便携式光合作用系统测定胡杨在不同灌水量的光合CO_(2)特征参数,采用4种光响应模型(直角双曲线模型、非直角双曲线模型、直角双曲线修正模型、指数模型)对胡杨的光合特征参数进行拟合分析。结果表明:4种模型对不同灌水量下胡杨光合–CO_(2)响应过程的拟合决定系数(R^(2))均大于0.97;直角双曲线修正模型(MRHM)和指数模型(EEM)对胡杨的光合参数拟合较好,MRHM的精度更高;3个灌水处理下3、5、7 a生胡杨特征值的综合平均相对误差(ARE)分别为0.093、0.084、0.084;3 a生胡杨的净光合速率在3个灌水处理下均有变化,但相差较小,3 a生胡杨的净光合速率(Pn)、CO_(2)饱和点(CSP)在每株每次灌水40 kg处理下最大,5、7 a生胡杨的净光合速率和光合能力均在每株每次灌水60 kg处理下最大。综合分析,3 a生胡杨生长适宜灌水量为每株每次灌水40 kg,5、7 a生胡杨生长适宜灌水量为每株每次灌水60 kg。Four irrigation treatments,CK(no irrigation),T1(20 kg/plant-session),T2(40 kg/plant-session)and T3(60 kg/plant-session),were used for 3,5,7 a poplar as the test material.The photosynthetic CO_(2) response processes of 3,5,7 a poplar to different water irrigation were measured by Li-6400 portable photosynthesis system to obtain CO2 characteristic parameters,and four light response models including right-angle hyperbolic model,non-right-angle hyperbolic model,right-angle hyperbolic modified model,and exponential model were used to fit and analyze the photosynthetic characteristic parameters.The results showed that the fitted coefficients of determination(R^(2))of each model were greater than 0.97.The right-angle hyperbolic modified model(MRHM)and the exponential model fitted the photosynthetic parameters of poplar better,and the MRHM was more accurate,with the total integrated average relative error(ARE)of 0.093,0.084,0.084 for the 3,5,7 a poplar eigenvalues under the three irrigation treatments,respectively.The net photosynthetic rate of 3 a poplar varied little under the three irrigation treatments,and the net photosynthetic rate of 5 a and 7 a poplar was maximum under 60 kg/plant-session treatment.In the comprehensive analysis,the optiaml irrigation amount for 3 a poplar growth was 40 kg/plan-session,and the optimal irrigation amount for 5 a and 7 a poplar growth was 60 kg/plant-session under different irrigation treatments.

关 键 词：胡杨 灌水量 CO_(2)响应 光响应模型 

分 类 号：S792.110.1[农业科学—林木遗传育种]