Linking leaf elemental traits to biomass across forest biomes in the Himalayas  

作　　者：Nita DYOLA Eryuan LIANG Josep PEÑUELAS J.Julio CAMARERO Shalik Ram SIGDEL Sugam ARYAL Wentao LIN Xiang LIU Yongwen LIU Xingliang XU Sergio ROSSI 

机构地区：[1]State Key Laboratory of Tibetan Plateau Earth System,Environment and Resources(TPESER),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Laboratoire sur lesécosystèmes terrestres boréaux,Département des Sciences Fondamentales,Universitédu QuébecàChicoutimi,555,Boulevard de l′Université,Chicoutimi(QC)G7H2B1,Canada [4]CSIC,Global Ecology Unit CREAF-CSIC-UAB,Bellaterra,E-08193 Catalonia,Spain [5]CREAF,Cerdanyola del Vallès,E-08193 Catalonia,Spain [6]Instituto Pirenaico de Ecología(IPE-CSIC),Avenida Montañana 1005,Zaragoza 50059,Spain [7]Friedrich-Alexander-Universität Erlangen-Nürnberg,Institut für Geographie,Erlangen 91058,Germany [8]State Key Laboratory of Grassland Agro-Ecosystems,College of Ecology,Lanzhou University,Lanzhou 730000,China [9]Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China

出　　处：《Science China Earth Sciences》2024年第5期1518-1528,共11页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.42030508);the Second Tibetan Plateau Scientific Expedition and Research Program(Grant No.2019QZKK0301);supported by CAS-TWAS President’s Fellowship Program for International Ph.D.students;supported by Spanish Government(Grant Nos.PID2019-110521GB-I00 and TED2021-132627B-I00);the Catalan Government(Grant No.SGR 2017-1005)and the Fundación“Ramón Areces”(Grant No.CIVP20A6621);supported by the Spanish Government(Grant No.RTI2018-096884-B-C31)。

摘　　要：Plants require a number of essential elements in different proportions for ensuring their growth and development.The elemental concentrations in leaves reflect the functions and adaptations of plants under specific environmental conditions.However,less is known about how the spectrum of leaf elements associated with resource acquisition,photosynthesis and growth regulates forest biomass along broad elevational gradients.We examined the influence of leaf element distribution and diversity on forest biomass by analyzing ten elements(C,N,P,K,Ca,Mg,Zn,Fe,Cu,and Mn)in tree communities situated every 100 meters along an extensive elevation gradient,ranging from the tropical forest(80 meters above sea level)to the alpine treeline(4200 meters above sea level)in the Kangchenjunga Landscape in eastern Nepal Himalayas.We calculated communityweighted averages(reflecting dominant traits governing biomass,i.e.,mass-ratio effect)and functional divergence(reflecting increased trait variety,i.e.,complementarity effect)for leaf elements in a total of 1,859 trees representing 116 species.An increasing mass-ratio effect and decreasing complementarity in leaf elements enhance forest biomass accumulation.A combination of elements together with elevation explains biomass(52.2%of the variance)better than individual elemental trait diversity(0.05%to 21%of the variance).Elevation modulates trait diversity among plant species in biomass accumulation.Complementarity promotes biomass at lower elevations,but reduces biomass at higher elevations,demonstrating an interaction between elevation and complementarity.The interaction between elevation and mass-ratio effect produces heterogeneous effects on biomass along the elevation gradient.Our research indicates that biomass accumulation can be disproportionately affected by elevation due to interactions among trait diversities across vegetation zones.While higher trait variation enhances the adaptation of species to environmental changes,it reduces biomass accumulation,especially at higher elevat

关 键 词：Ecosystem function Elevational gradient Functional diversity Functional traits Leaf elements Niche complementarity 

分 类 号：S718.54[农业科学—林学]