Geographic variation in growth and phenology of two dominant central US grasses:consequences for climate change

作     者：Amanda L.Giuliani Eugene F.Kelly Alan K.Knapp 

作者机构：Department of BiologyColorado State UniversityFort CollinsCO 80523USA Department of Soils and Crops ScienceColorado State UniversityFort CollinsCO 80523USA Graduate Degree Program in Ecology and Department of BiologyColorado State UniversityFort CollinsCO 80523USA 

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

年 卷 期：2014年第7卷第3期

页      面：211-221页

核心收录：

学科分类：081702[工学-化学工艺] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 0703[理学-化学] 

基　　金：National Science Foundation(1027319 0218210 and 0823341) 

主　　题：grassland phenology productivity traits water stress 

摘      要：Aims The rate of climate change may exceed many plant species’migration rates,particularly for long-lived perennial species that dominate most *** bioclimatic envelopes shift more rapidly than dominant species can migrate,individuals located peripheral to biomes or in adjacent biomes may become a significant source of traits for future dominant populations(DPs).Thus,traits of individuals from peripheral populations(PPs)may affect future ecosystem functioning more than those of today’s *** We assessed key traits of individuals collected from populations that currently dominate two central US grasslands,the shortgrass steppe(Bouteloua gracilis)and the tallgrass prairie(Andropogon gerardii).We compared these to individuals from PPs in a reciprocal-transplant common garden experiment with gardens at the Shortgrass Steppe Long Term Ecological Research site in Colorado and the Konza Prairie Biological Station Long Term Ecological Research site in *** and PPs were subjected to high and reduced water availability in common gardens located in each *** measured included the following:individual plant biomass,reproductive allocation,specific leaf area(SLA)and plant–water *** focused on the climate-change relevant comparisons of traits from PPs versus DPs expressed under the climate of *** Findings PPs of *** differed from DPs primarily in phenological *** a semiarid shortgrass steppe climate,PPs initiated flowering later in the season,produced fewer reproductive tillers and were more sensitive to water *** differences between populations were *** ***,biomass in PPs was 50%lower than in DPs under the mesic tallgrass prairie climate and reproductive tillers were considerably smaller,despite higher SLA in *** of PPs was less sensitive to water stress,*** these results,we conclude that key traits of PPs differed from DPs in both grassland types,but potential effects on r