重庆铜锣山不同类型木本植物叶片光合能力参数与叶性状的种间关系  

A study on the relationship between photosynthetic capacity parameters and leaf traits of different types of woody plants in Tongluo Mountain,Chongqing

作　　者：徐铭泽 马磊 司洪涛 姚璐 刘江 朱冬雪 王琛 毛铮 朱丹 王科 严有龙 李成 XU Mingze;MA Lei;SI Hongtao;YAO Lu;LIU Jiang;ZHU Dongxue;WANG Chen;MAO Zheng;ZHU Dan;WANG Ke;YAN Youlong;LI Cheng(Observation and Research Station of Ecological Restoration for Chongqing Typical Mining Areas,Ministry of Natural Resources(Chongqing Institute of Geology and Mineral Resources),Chongqing 401120,China;College of Resources and Environmental Science,China Agricultural University,Beijing 100089,China;Chongqing Huadi Resources and Environmental Technology Co.,Ltd,,Chongqing 401120,China;College of Soil and Water Conservation,Beijing Forestry University,Beijing 100089,China)

机构地区：[1]自然资源部重庆典型矿区生态修复野外科学观测研究站(重庆地质矿产研究院),重庆401120 [2]中国农业大学资源与环境学院,北京100089 [3]重庆华地资环科技有限公司,重庆401120 [4]北京林业大学水土保持学院,北京100089

出　　处：《生态学报》2025年第6期2753-2767,共15页Acta Ecologica Sinica

基　　金：重庆市科技局自然科学基金面上项目(CSTB2022NSCQ-MSX1121,CSTB2022NSCQ-MSX0280)。

摘　　要：在光合作用模型中,植物叶片光合能力通常由最大碳同化速率(A_(max))、表观量子效率(AQY)、最大羧化速率(V_(cmax))和最大电子传递速率(J_(max))表征。目前对于种间尺度,叶性状对不同类型植物光合能力参数影响机制的研究仍不清楚。采用Li-6800便携式光合仪于生长季旺季,测量了重庆铜锣山26种木本植物的光响应曲线和二氧化碳响应曲线,进一步计算了4种光合能力参数(A_(max)、AQY、V_(cmax)和J_(max)),并同步测定了单位面积叶氮含量(N_(area))、单位面积叶碳含量(C_(area))、叶碳氮比(C∶N)、叶绿素含量(Chl)、叶片相对含水量(LRWC)、比叶重(LMA)、叶厚度(L_t)和叶干物质含量(LDMC)8种叶性状,探究铜锣山木本植物光合能力参数与叶性状的种间关系。结果表明:铜锣山26种木本植物A_(max)、AQY、V_(cmax)和J_(max)的变异范围分别为3.35—18.85μmol m^(-2)s^(-1),0.009—0.066 mol/mol,10.05—81.89μmol m^(-2)s^(-1)和33.45—140.92μmol m^(-2)s^(-1)。光合能力参数平均种间变异系数为47.7%,其种间变异程度高于叶性状(26.9%)。叶片光合能力在乔木和灌木植物间没有显著差异,落叶植物的光合能力显著高于常绿植物。光合能力参数与N_(area)和LRWC呈显著正相关,与C∶N呈显著负相关。N_(area)是估算种间植物光合能力变异的最佳叶性状,但在常绿植物中,N_(area)对四种光合能力参数的预测性要低于LRWC。N_(area)主要通过直接影响V_(cmax)间接影响AQY、V_(cmax)和J_(max),LRWC通过直接影响V_(cmax)和J_(max)间接影响AQY和A_(max)。总体而言,基于N_(area)、LRWC和C∶N构建的多元线性回归模型决定系数高于任何单一叶性状预测模型,在所有植物类型条件下,其决定系数均在0.7以上,表明其具有较好的预测性。研究结果为改进亚热带地区常绿落叶阔叶林植物的光合能力估算模型提供理论依据。In the photosynthesis model,the photosynthetic capacity of plants is typically characterized by the maximum carbon assimilation rate(A_(max)),apparent quantum yield(AQY),maximum carboxylation rate(V_(cmax)),and maximum electron transfer rate(Jmax).The mechanisms by which leaf traits influence photosynthetic capacity parameters of different types of plants at the interspecific scale remain unclear.In this study,we used a Li-6800 portable photosynthesis analyzer to measure the light response curves and carbon dioxide response curves of 26 woody plants in Tongluo Mountain during the peak growing season.Four photosynthetic capacity parameters(i.e.,A_(max),AQY,V_(cmax),and Jmax)were further calculated,and eight leaf traits,including leaf nitrogen content per area(N_(area)),leaf carbon content per area(Carea),ratio of leaf carbon to nitrogen content(C∶N),chlorophyll content(Chl),leaf relative water content(LRWC),leaf mass per area(LMA),leaf thickness(Lt),and leaf dry matter content(LDMC)were simultaneously measured.These measurements aimed to explore the interspecific relationships between photosynthetic capacity parameters and leaf traits of woody plants in Tongluo Mountain.The results showed that the variation ranges of A_(max),AQY,V_(cmax),and Jmax of 26 woody plants were 3.35—18.85μmol m^(-2)s^(-1),0.009-0.066 mol/mol,10.05—81.89μmol m^(-2)s^(-1),and 33.45—140.92μmol m^(-2)s^(-1),respectively.The average inter-species variation coefficient of photosynthetic capacity parameters was 47.7%,and the degree of interspecific variation was higher than the average inter-species variation coefficient of 26.9%for leaf traits.There was no significant difference in leaf photosynthetic capacity between trees and shrubs,while deciduous plants had significantly higher photosynthetic capacity than evergreen plants.The photosynthetic capacity parameters were significantly positively correlated with N_(area)and LRWC,and significantly negatively correlated with C∶N.N_(area)was the best leaf trait for estimating plant phot

关 键 词：光合能力 叶功能性状 种间差异 木本植物 

分 类 号：Q94[生物学—植物学]