红松和水曲柳叶生态化学计量及养分重吸收特征的地理变异  

Geographical variation of ecological stoichiometry and nutrient resorption in leaves of Pinus koraiensis and Fraxinus mandshurica

作　　者：闫媛媛 郭琪 管俊泽 刘志[1] 王东男 谷加存[1] YAN Yuanyuan;GUO Qi;GUAN Junze;LIU Zhi;WANG Dongnan;GU Jiacun(Ministry of Education Key Laboratory of Sustainable Forest Ecosystem Management,School of Forestry,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学林学院,森林生态系统可持续经营教育部重点实验室,哈尔滨150040

出　　处：《应用生态学报》2023年第4期977-984,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(32071749);中央高校基本科研业务费项目(2572020DR05)。

摘　　要：以我国东北地区4个纬度针叶树种红松和阔叶树种水曲柳为对象,研究两树种成熟叶碳(C)、氮(N)、磷(P)化学计量特征和养分重吸收率及其相关性,分析气候和土壤因子对叶化学计量特征及养分重吸收率的影响。结果表明:叶化学计量特征的地理变异存在种间差异,随着纬度的升高,水曲柳叶C、N含量显著增加;水曲柳C∶N、红松N∶P均与纬度呈显著负相关,而水曲柳N∶P与纬度呈显著正相关。红松磷重吸收率与纬度呈显著正相关。相关分析表明,红松和水曲柳叶的生态化学计量特征主要受到气候因子(年均温和降水量)的影响,而养分重吸收率仅受少数土壤因子(pH和全氮)的影响。主成分分析表明,红松和水曲柳磷重吸收率与N∶P均呈显著负相关,与P含量呈显著正相关;氮重吸收率仅在红松中与P含量呈显著正相关,与N∶P呈显著负相关。水曲柳相比红松更倾向于具有快速投资-收益型特征。In this study,we sampled leaves of coniferous species Pinus koraiensis and broad-leaved tree species Fraxinus mandshurica from four latitudes in northeastern China to investigate the carbon(C),nitrogen(N),phosphorus(P)stoichiometric characteristics and nutrient resorption efficiency and their potential relationships,as well as their responses to climatic and edaphic factors.The results showed that stoichiometric characteristics were species-specific,and that the C and N contents in leaves of F.mandshurica significantly increased with increasing latitude.The C:N of F.mandshurica and N:P of P.koraiensis were negatively correlated with latitude,but an inverse relationship was found for N:P of F.mandshurica.P resorption efficiency was significantly correlated with latitude in P.koraiensis.The spatial variation of ecological stoichiometry of these two species was mainly affected by climatic factors such as mean annual temperature and precipitation,while that of nutrient resorption was influenced by several soil factors such as soil pH and nitrogen content.Principal component analysis showed that P resorption efficiency of P.koraiensis and F.mandshurica was significantly negatively correlated with N:P,but positively correlated with P content.N resorption efficiency showed significantly positive correlation with P content but negative correlation with N:P in P.koraiensis.Compared with P.koraiensis,F.mandshurica was more inclined to fast investment and return in terms of leaf traits.

关 键 词：生态化学计量 种内变异 养分重吸收 纬度 环境变化 

分 类 号：S791.247[农业科学—林木遗传育种] S792.41[农业科学—林学]