Nutrient resorption from senescing leaves of epiphytes,hemiparasites and their hosts in tropical forests of Sri Lanka

作     者：Lalith D.B.Suriyagoda Ranil Rajapaksha Gamini Pushpakumara Hans Lambers 

作者机构：Department of Crop ScienceFaculty of AgricultureUniversity of PeradeniyaPeradeniya20400Sri Lanka School of Biological Sciences and Institute of AgricultureThe University of Western Australia35 Stirling HighwayCrawley(Perth)Western Australia 6009Australia 

出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)

年 卷 期：2018年第11卷第6期

页      面：815-826页

核心收录：

学科分类：080705[工学-制冷及低温工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：Financial support was provided by the University of Peradeniya Research technical assistance by G.Wijesuriya and P.Samarasinghe reviewer’s comments on an earlier version of the manuscript 

主　　题：calcium nitrogen phosphorus potassium resorption tropical humid forests 

摘      要：Aims Epiphytes and hemiparasites do not have direct access to soil *** acquire nutrients through symbiosis,foliar leachates and throughfall,whilst hemiparasites have specialized structures(haustoria)to acquire nutrients from their *** of the green leaf nutrient concentrations of epiphytes,hemiparasites and their hosts,nutrient-resorption efficiency and proficiency are expected to be the greater in epiphytes than in their hosts and in *** hypotheses were *** Green and senescing leaves of epiphytes(n=23),hemiparasites(n=9)and their hosts were collected,and leaf area,leaf dry weight,nutrient(nitrogen-N,phosphorus-P,potassium-K,calcium-Ca)and sodium(Na)concentrations were measured,and resorption effi-ciency(%)and proficiency were *** Findings Concentrations of N,P,K,Ca and Na in green leaves of epiphytes and hemiparasites were either similar or greater than those of their hosts,except for lower green leaf N concentration in *** resorbed N,P,K and Na,while their hosts resorbed only N,P and *** and their hosts resorbed P,K and Na while N was not ***,resorption efficiency was great-est in epiphyteshemiparasites=hosts,while the resorption pro-ficiencies were similar or greater for epiphytes and hemiparasites compared with their hosts,except for N in *** high nutrient concentrations in epiphytes were associated with greater resorption *** contrasting nutrient concentrations in epiphytes,hemiparasites and their hosts will be important in recognising their contribution to ecosystem nutrient cycling.