Patterns and driving factors of leaf C,N,and P stoichiometry in two forest types with different stand ages in a mid-subtropical zone  

作　　者：Yunni Chang Quanlin Zhong Hong Yang Chaobin Xu Weiping Hua Baoyin Li 

机构地区：[1]Fujian Provincial Key Laboratory for Plant Eco-physiology,Fujian Normal University,Fuzhou,350007,China [2]College of Geographical Sciences,Fujian Normal University,Fuzhou,350007,China [3]State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province,Fujian Normal University,Fuzhou,350007,China [4]College of Environmental Science and Engineering,Fujian Normal University,Fuzhou,350007,China [5]Department of Geography and Environmental Science,University of Reading,Reading,UK [6]College of Ecological and Resources Engineering,Wuyi University,Wuyishan,354300,China [7]College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,350002,China

出　　处：《Forest Ecosystems》2022年第1期47-56,共10页森林生态系统（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.31971643);the Industry-University Cooperation Project of Fujian Science and Technology Department(Nos.2020N5008,2019N5009);the General program of Natural Science Foundation of Fujian Province of China(No.2018J01737);Special Funding Project of Fujian Provincial Department of Finance(SC-299);Minjiang Scholar Programme.

摘　　要：Background:Carbon(C),nitrogen(N),and phosphorus(P)stoichiometry is a key indicator of nutrient utilization in plants,and C/N/P ratios are related to the life histories and adaptation strategies of tree species.However,no consensus has been reached on how leaf stoichiometric characteristics are affected by forest type and stand ages.The relationships between leaf stoichiometry and geographical,meteorological,and soil factors also remain poorly understood.Methods:Leaf and soil were sampled from forest stands of different age groups(young,middle-aged,near-mature,and mature)in two forest types(Chinese fir(Cunninghamia lanceolata)forests and evergreen broadleaved forests).The relationships between leaf C,N,and P stoichiometric parameters and geographical,meteorological,and soil factors were analysed by using redundancy analysis(RDA)and stepwise linear regression analysis.Results:Leaf C concentrations peaked in the near-mature stands with increasing age irrespective of forest type.Leaf N and P concentrations fluctuated with a rising trend in Chinese fir forests,while decreased first and increased later from young to mature phases in natural evergreen broadleaved forests.Chinese fir forests were primarily limited by N and P,while natural evergreen broadleaved forests were more susceptible to P limitation.Leaf C,N,and P stoichiometric characteristics in Chinese fir forests were mainly affected by the soil total P concentration(SP),longitude(LNG),growing season precipitation(GSP)and mean temperature in July(JUT).The leaf C concentration was mainly affected by GSP and JUT;leaf N and P concentrations were both positively correlated with LNG;and leaf P was positively correlated with SP.In evergreen broadleaved forests,however,leaf stoichiometric parameters displayed significant correlations with latitude(LAT)and mean annual precipitation(MAP).Conclusions:Leaf stoichiometry differed among forest stands of different age groups and forest types.Leaf C,N,and P stoichiometry was primarily explained by the combinations of SP,LNG,G

关 键 词：Leaf stoichiometry C/N/P ratios Environmental factors Stand age groups Chinese fir forest Natural evergreen broadleaved forest 

分 类 号：S718.5[农业科学—林学]