Alien plant species coexist over time with native ones in Chilean Mediterranean grasslands
作者机构：Department of EcologyComplutense University of MadridMadridSpain Department of EcologyAutónoma University of MadridMadridSpain Faculty of Agricultural SciencesUniversity of TalcaTalcaChile Agricultural Research Institute INIA-La CruzLa CruzChile
出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)
年 卷 期：2016年第9卷第6期
页 面：682-691页
核心收录：
学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 0901[农学-作物学] 0902[农学-园艺学] 0713[理学-生态学]
基 金：the Spanish Ministry of Science and Innovation for the financial support received for the present study,reference CGL2009-08718 the Spanish Ministry of Education,Culture and Sport for the pre-doctoral FPU scholarship of the main author,reference AP2009-0518 the support provided by Juan María Arenas,Javier Seoane,Nagore García and especially for the advice and suggestions provided by Greg Guerin the assistance of the entire INIA-Cauquenes Institution in central Chile,especially the contributions by Teresa Aravena
主 题：community dynamics land abandonment gradient life-form livestock grazing successional gradient
摘 要：Aims Alien species are commonly considered as harmful weeds capa-ble of decreasing native biodiversity and threatening *** this assumption,little is known about the long-term patterns of the native-alien relationships associated with human disturbed managed *** study aims to elucidate the commu-nity dynamics associated with a successional gradient in chilean Mediterranean grasslands,considering both native and alien *** Species richness(natives and aliens separately)and life-form(annu-als and perennials)were recorded in four chilean post-agricultural grazed grasslands each covering a broad successional gradient(from 1 to 40 years since crop abandonment).A detrended correspondence analysis(DcA),mixed model effects analyses and cor-relation tests were conducted to assess how this temporal gradient influenced natives and aliens through community *** Findings Our results show different life-form patterns between natives and aliens over *** were mainly represented by annuals(especially ruderals and weeds),which were established at the beginning of *** aliens also predominated at mid-successional stages,but in old grasslands native species were slightly more representative than alien ones within the *** the late successional states,positive or no correlations at all between alien and native species richness suggested the absence of competition between both species groups,as a result of differ-ent strategies in occupation of the *** dynamics over time constitute a net gain in biodiversity,increasing natives and maintaining a general alien pool,allowing the coexistence of *** interactions including facilitation and/or tolerance processes might be occurring in chilean post-agricultural grasslands,a fact that contradicts the accepted idea of the alien species as contenders.
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