Long-term changes in biological soil crust cover and composition
作者机构:Department of BiologyUniversity of New MexicoMSC0320201 University of New MexicoAlbuquerqueNM 98131U.S.A. 2914 Central St.SEOlympiaWA 98501U.S.A. School of Environmental and Forest SciencesUniversity of WashingtonBox 354115SeattleWA98195-4115U.S.A.
出 版 物:《Ecological Processes》 (生态过程(英文))
年 卷 期:2013年第2卷第1期
页 面:54-63页
核心收录:
学科分类:0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学]
基 金:Information on site history and assistance with site logistics were provided by Barbara Benner and the Bureau of Land Management.Jessica DaBell assisted with field work Jean Caldwell with GIS analysis and Loveday Conquest with statistical analysis.Funding for the 2010 re-measurement of these plots was provided by the Joint Fire Science Program under Project JFSP 08-1-5-20
主 题:Biological soil crust Columbia basin Composition change Taxa turnover rate Fire Bromus tectorum Livestock exclosure
摘 要:Introduction:Communities change over time due to disturbances,variations in climate,and species *** soil crust communities are important because they contribute to erosion control and nutrient *** types may respond differently to changes in environmental conditions:single-celled organisms and bryophytes quickly recover after a disturbance,while lichens are slow growing and dominate favorable *** change in crusts has seldom been assessed using repeated *** this study,we hypothesized that changes in crust composition were related to disturbance,topographic position,and invasive ***:We monitored permanent plots in the Columbia Basin in 1999 and 2010 and compared changes in crust composition,cover,richness,and turnover with predictor variables of herbivore exclosure,elevation,heat load index,time since fire,presence of an invasive grass,and change in cover of the invasive ***:Bryophytes were cosmopolitan with high *** lichens did not change *** taxa differed by monitoring *** and total crust cover declined,and there was lower turnover outside of herbivore *** cover did not change *** that burned recently had high *** in taxon richness was correlated with presence of an invasive grass in *** in cover of the invasive grass was positively related to proportional loss and negatively related to ***:Composition and turnover metrics differed significantly over 11 years,though cover was more stable between *** study can be a baseline for assessing change in crust composition due to anthropogenic influences.