Mountain invasions on the way:are there climatic constraints for the expansion of alien woody species along an elevation gradient in Argentina?
作者机构：Instituto Multidisciplinario de BiologíaVegetal(CONICET-UNC)Velez Sarsfield 1611.Córdoba 5000Argentina Facultad de Ciencias Exactas Físicas y NaturalesUniversidad Nacional de CórdobaVelez Sarsfield 299Córdoba 5000Argentina Facultad de Ciencias AgrariasUniversidad Nacional de Catamarca.Maestro Quiroga 51Catamarca 4700Argentina
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4期
页 面：380-392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）] 1002[医学-临床医学] 0901[农学-作物学] 100214[医学-肿瘤学] 0902[农学-园艺学] 0713[理学-生态学] 10[医学]
基 金：Fondo para la Investigación Científica y Tecnológica FONCyT(BID PICT 953) Consejo Nacional de Investigaciones Científicas y Técnicas(CONiCET)(PIP 1286) the Inter-American Institute for Global Change Research(CRN II 2005 supported by the US National Science Foundation Inter-American Institute for Global Change Research(IAI)Grant GEO-0452325) Secretaría de Ciencia y Tecnología-Universidad Nacional de Córdoba(Secyt)(Universidad Nacional de Córdoba)
主 题：altitudinal gradient exotic species Gleditsia triacanthos Ligustrum lucidum Pyracantha angustifolia seedling establishment
摘 要：Aims Increasing evidence worldwide indicates that high mountain regions are not immune to invasion by alien ***,we aimed to address whether three major woody invaders of low-mountain areas are constrained to lower altitudes due to climatic restrictions or just by low propagule *** hypothesize that the increasing climatic harshness towards higher altitudes restricts seedling establishment and survival of these woody invaders and thus their potential for altitudinal *** The study was carried out in the Sierras Grandes Mountains,Córdoba,central Argentina(32°50′S,64°90′W).We addressed the hypothesis with an experimental approach,dissociating the effect of the environmental gradient from that of propagule pressure,by discarding the influence of seed *** translocated seeds of Gleditsia triacanthos L.,Ligustrum lucidum *** Pyracantha angustifolia(Franch.)*** the altitudinal gradient(from 900 to 2700 m asl).Seven sites were selected along the altitudinal gradient,spaced every 200-400 *** plots(4×4 m)were selected within each altitudinal site and excluded from livestock;100 seeds of each species were sown within each plot(6300 seeds in total).Seedling emergence and survival was monitored during two growing seasons and soil temperature and moisture was recorded as *** field experiment was complemented with lab *** Findings Climate along this altitudinal gradient might be least restrictive at mid elevations,as a result of the intersection between opposite soil temperature and moisture *** seeds germinated along the whole altitudinal gradient and seedlings successfully established and over-wintered well above their current altitudinal distribution(up to 2200 m for Ligustrum and 2400 m for Gleditsia and Pyracantha).Additional lab assays confirmed field patterns and gave some insights into contrasting regeneration strategies between these invaders that might help to overcome stochastic e
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