武夷山不同海拔阔叶树叶片养分含量及再吸收效率  

Nutrient content and resorption efficiency of leaves of broad-leaved trees along altitudes in Wuyi

作　　者：吴欣阳 邵静 陈晓萍 李锦隆 胡丹丹 钟全林[1,2,3] 程栋梁[1,3] WU Xinyangg;SHAO Jing;CHEN Xiaoping;LI Jinlong;HU Dandan;ZHONG Quanlin;CHG Donglang(Insiute of Cegaphy,Fujan Nomal Unvesiy,Fuzhou 30007,China;Fujian Provincial Key Laboratory of Plant Eco-physiology,Fujian Normal University,Fuzhou 350007,China;Key Laboratory of Eco-Geographic Processes of Humid Subtropical Tropics,Fujian Normal University,Fuzhou 350007,China)

机构地区：[1]福建师范大学地理研究所,福州350007 [2]福建师范大学福建省植物生理生态重点实验室,福州350007 [3]福建师范大学湿润亚热带生态-地理过程教育部重点实验室,福州350007

出　　处：《应用生态学报》2023年第9期2305-2313,共9页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(32071555,32001094,31971643);福建省科技厅公益类重点项目(2022R1002002)资助。

摘　　要：为揭示亚热带山地阔叶树叶片养分利用策略随海拔梯度的变化规律,本研究选取武夷山不同海拔(1400、1600和1800 m)44种阔叶树,研究成熟与衰老叶片养分含量、化学计量比及养分再吸收效率,并分析其异速生长关系。结果表明:成熟叶片氮(N)、磷(P)含量显著高于衰老叶,且均随海拔升高而升高。磷再吸收效率(PRE)与氮再吸收效率(NRE)的平均值分别为48.3%和34.9%,PRE显著高于NRE,养分再吸收效率随海拔变化无显著差异。NRE与成熟叶N含量在低海拔处(1400 m)呈正等速生长,与衰老叶N含量在高海拔处(1800 m)呈负异速生长。PRE与衰老叶片N、P含量在低海拔(1400 m处)呈负等速生长,在高海拔处(1600、1800 m)呈负异速生长。各海拔PRE-NRE异速生长指数为0.95。随着海拔的升高,成熟和衰老叶片养分含量升高,但海拔不影响养分再吸收效率,且植物偏好从衰老叶中再吸收P,高海拔养分再吸收效率会影响衰老叶片的养分状况。To reveal the variation of leaf nutrient utilization strategies with altitude gradient in subtropical mountain broadleaved trees,44 species of broadleaved trees at different altitudes(1400,1600 and 1800 m)in Wuyi Mountains were selected to measure nutrient content,stoichiometric ratio,and nutrient resorption efficiency of green and senescent leaves,and analyzed their allometric growth relationships.The results showed that nitrogen(N)and phosphorus(P)contents in green leaves were significantly higher than those in senescent leaves,which increased with the increases of altitude.The average values of phosphorus resorption efficiency(PRE)and nitrogen resorption efficiency(NRE)were 48.3%and 34.9%,respectively.PRE was significantly higher than NRE.There was no significant difference in nutrient resorption efficiency with altitude.NRE had positive isokinetic growth with and mature leaf N content at low altitude(1400 m)and negative allometry growth with senescent leaf N content at high altitude(1800 m).PRE and N and P contents of senescent leaves had negative isokinetic growth at low altitude(1400 m)and negative allometry growth at high altitudes(1600 and 1800 m).PRE-NRE allometric growth index was 0.95 at each altitude.The nutrient contents of green and senescent leaves increased with the increases of altitude,but altitude did not affect nutrient resorption efficiency.Plants preferred to re-absorbed P from senescent leaves.Nutrient resorption efficiency of leaves at high altitude affected the nutrient status of senescent leaves.

关 键 词：亚热带森林 成熟叶 衰老叶 异速生长 海拔 养分再吸收效率 

分 类 号：S718.5[农业科学—林学]