不同地理种源杉木细根形态及生态化学计量特征  

Fine root morphology and ecological stoichiometric characteristics of Cunninghamia lanceolata from different provenances

作　　者：吴小健 李秉钧 颜耀 吴鹏飞[1,2] 李明 马祥庆[1,2] WU Xiaojian;LI Bingjun;YAN Yao;WU Pengfei;LI Ming;MA Xiangqing(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Chinese Fir Engineering Technology Research Center of National Forestry and Grassland Administration,Fuzhou,Fujian 350002,China)

机构地区：[1]福建农林大学林学院,福建福州350002 [2]国家林业和草原局杉木工程技术研究中心,福建福州350002

出　　处：《森林与环境学报》2023年第2期113-122,共10页Journal of Forest and Environment

基　　金：国家自然科学基金面上项目“不同地理类型杉木功能性状的适应性进化与资源配置权衡”(31971674);福建农林大学科技创新专项“不同种源杉木细根差异的比较研究”(CXZX2019038G)。

摘　　要：为探究不同种源杉木细根对环境的适应策略及其地理分布规律,筛选出养分高效利用的杉木种源,以我国杉木分布区内的16个当地种源杉木林为研究对象,用根序分级法测定细根平均直径(RAD)、比表面积(SSA)、组织密度(RTD)、比根长(SRL)及其C、N、P含量等功能性状指标,分析细根功能性状在不同种源和不同分布区间的差异及变化规律,揭示不同序级细根性状与环境因子的相关性。结果表明:不同种源杉木细根形态存在显著差异(P<0.05),云南马关、广西融水(南带)种源的细根RAD总体上大于河南信阳、湖北罗田(北带)种源。不同分布区杉木细根SRL和SSA表现为:中带西区>中带中区>北带>中带东区>南带。细根化学计量特征在不同种源间也存在显著差异(P<0.05),河南信阳种源细根各根序内C含量和C∶N最小。细根C含量在不同分布区间表现为:中带中区>中带西区>中带东区>南带>北带,而N含量则相反。N∶P表现为:南带>中带东区>北带>中带中区>中带西区。冗余分析发现,细根RAD和年平均气温是影响C含量的主控因子。各根级N含量与经度呈显著正相关关系(P<0.05),与海拔和土壤磷含量呈显著负相关关系(P<0.05);RTD与年平均降水量呈显著正相关关系(P<0.05)。不同种源杉木细根性状的差异与分布区气候因子显著相关,反映了各种源杉木细根对环境变化的适应策略不同。The objectives of this study were to reveal the adaptation strategies and geographical distribution of the fine roots of Chinese fir(Cunninghamia lanceolata) from different provenances in response to environmental changes and to screen out Chinese fir provenances for efficient nutrient use. In this study, 16 local provenance Chinese fir plantations in a subtropical distribution area were selected, and fine root traits were investigated using the branch order classification method. The fine root average diameter(RAD), specific surface area(SSA), root tissue density(RTD), specific root length(SRL), carbon(C), nitrogen(N), and phosphorus(P) contents were measured. We analyzed the differences and variations in the functional traits of fine roots among different provenances and distribution regions. The correlation between fine root traits of different orders and environmental factors was examined. The findings revealed significant differences in fine root morphology among the different provenances(P<0.05). In general, the RAD of fine roots in the southern belt provenances of Maguan in Yunnan and Rongshui in Guangxi was higher than those of Xinyang in Henan and Luotian in Hubei, which are from the northern belt. The SRL and SSA of fine roots of Chinese fir in different distribution areas were ranked in the following order: west of the middle belt > center of the middle belt > northern belt > east of the middle belt > southern belt. In addition, there were significant differences in fine root ecological stoichiometry between provenances(P<0.05). The C content and C∶N ratio of each branch order in Xinyang Province in Henan were the lowest. The C content of fine roots in the middle provenance was generally higher than that in other provenances, with the change pattern as follows: center of middle belt > west of middle belt > east of middle belt > southern belt > northern belt. However, the N content showed an opposite trend. The N∶P changed as follows: southern belt > east of middle belt > northern belt > center of m

关 键 词：杉木 地理种源 细根形态 化学计量 气候因子 地理分布规律 

分 类 号：S791.27[农业科学—林木遗传育种]