Influence of experimental soil disturbances on the diversity of plants in agricultural grasslands  

作　　者：Jörg Müller Johannes Heinze Jasmin Joshi Steffen Boch Valentin H.Klaus Markus Fischer Daniel Prati 

机构地区：[1]Institute of Biochemistry,and Biology,University of Potsdam,Maulbeerallee 1,14469 Potsdam,Germany [2]Freie Universität Berlin,Institut für Biologie,Berlin-Brandenburg Institute of Advanced Biodiversity Research,Altensteinstrasse 6,14195 Berlin,Germany [3]Institute of Plant Sciences,University of Bern,Altenbergrain 21,3013 Bern,Switzerland [4]Institute of Landscape Ecology,University of Münster,Heisenbergstr.2,48149 Münster,Germany [5]Biodiversity and Climate Research Centre BIK-F,Senckenberg Gesellschaft für Naturforschung,603257 Frankfurt,Germany

出　　处：《Journal of Plant Ecology》2014年第6期509-517,共9页植物生态学报（英文版）

基　　金：The DFG Priority Program 1374“Infrastructure-Biodiversity-Exploratories”(FI 1246/6-1,FI 1246/9-1,HO 3830/2-1)of the German Research Foundation;the Potsdam Graduate School of University Potsdam.

摘　　要：Aims and Methods Disturbance is supposed to play an important role for biodiversity and ecosystem stability as described by the intermediate disturbance hypoth-esis(IDH),which predicts highest species richness at intermediate levels of disturbances.In this study,we tested the effects of artificial soil distur-bances on diversity of annual and perennial vascular plants and bryo-phytes in a field experiment in 86 agricultural grasslands differing in land use in two regions of Germany.On each grassland,we implemented four treatments:three treatments differing in application time of soil dis-turbances and one control.One year after experimental disturbance,we recorded vegetation and measured biomass productivity and bare ground.We analysed the disturbance response taking effects of region and land-use-accompanied disturbance regimes into account.Important Findings Region and land-use type strongly determined plant species rich-ness.Experimental disturbances had small positive effects on the species richness of annuals,but none on perennials or bryophytes.Bare ground was positively related to species richness of bryophytes.However,exceeding the creation of 12%bare ground further distur-bance had a detrimental effect on bryophyte species richness,which corresponds to the IDH.As biomass productivity was unaffected by disturbance our results indicate that the disturbance effect on spe-cies richness of annuals was not due to decreased overall produc-tivity,but rather due to short-term lowered inter-and intraspecific competition at the newly created microsites.Generally,our results highlight the importance of soil disturbances for species richness of annual plants and bryophytes in agricultural grasslands.However,most grasslands were disturbed naturally or by land-use practices and our additional experimental soil dis-turbances only had a small short-term effect.Overall,total plant diversity in grasslands seemed to be more limited by the availabil-ity of propagules rather than by suitable microsites for germination.Thus,na

关 键 词：ANNUALS BRYOPHYTES COLONIZATION intermediate disturbance hypothesis MICROSITES 

分 类 号：S71[农业科学—林学]