Road effects on vegetation composition in a saline environment  

作　　者：Sheng-Lan Zeng Ting-Ting Zhang Yu Gao Bo Li Chang-Ming Fang S.Luke Flory Bin Zhao 

机构地区：[1]Coastal Ecosystems Research Station of the Yangtze River Estuary,Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering,Institute of Biodiversity Science,Fudan University,220 Han Dan Road,Shanghai 200433,P.R.China [2]Department of Biology,Indiana University,1001 East 3rd Street,Bloomington,IN 47405,USA

出　　处：《Journal of Plant Ecology》2012年第2期206-218,共13页植物生态学报（英文版）

基　　金：National Basic Research Program of China(2010CB950602,2006CB403305);Natural Science Foundation of China(30870409);National Key Technology R&D Program(2010BAK69B15).

摘　　要：Aims Road effects from maintenance and traffic have the potential to alter plant communities,but the exact relationships between these effects and changes in plant community composition have not often been studied in diverse environments.To determine the direction and level of community composition changes in saline environment due to road effects,we conducted a study along roads of different ages and in nearby non-road(i.e.natural)areas in the Yellow River Delta,China.Additionally,to potentially elucidate the mechanisms underlying the changes in the richness and composition of plant communities along roads,we evaluated physiochemical changes in soil of roadside and non-road areas.Methods Floristic and environmental data were collected along roadside of different ages and nearby non-road areas.To evaluate plant communities at each site,six 2 m 32 m quadrats were placed at 3-m intervals along roads and six quadrats were arranged randomly in non-road areas.To determine the difference in plant community composition betweenroadside andnon-road areas,wemeasuredspecies richness and the abundance of each species,examined species turnover and floristic dissimilarity between the two areas and positioned plant species and sites in an abstract multivariate space.Plant community(species richness,percentage of halophytes)and soil physicochemical properties(pH,salinity,moisture content,bulk density,nitrate and ammonium nitrogen concentration)were compared between roadside and non-road areas(young roadside vs.corresponding non-road areas,old roadside vs.corresponding non-road areas)by using t-tests.Classification and ordination techniques were used to examine the relationship between vegetation and related environmental variables in both roadside and non-road areas.Important Findings For both the young and old roadside areas,species richness in roadside areas was significantly higher than in non-road areas and high floristic dissimilarity values indicated that roadside and non-road areas differed greatly in community compositio

关 键 词：road effect SALINIZATION species composition vegetation–environment relationships 

分 类 号：S15[农业科学—土壤学]