{"title":"Gradient analysis of relationships among fire, environment, and vegetation in a southwestern USA mountain range'","authors":"Andrew M. Barton","doi":"10.2307/2997180","DOIUrl":null,"url":null,"abstract":"BARTON, A. M. (Department of Biology, University of Michigan, Ann Arbor, MI 48109). Gradient analysis of relationships among fire, environment, and vegetation in a southwestern USA mountain range. Bull. Torrey Bot. Club 121: 251-265. 1994.-I investigated interrelationships among topography, resources/conditions, fire, and woody vegetation over the lower half of an elevational gradient, from arid lowlands to productive intermediate elevations, in the Chiricahua Mountains in southeastern Arizona. With increasing elevation, soil water potential, litter depth, organic carbon, canopy cover, and fire probability increased, whereas forest-floor light levels, soil temperature, pH, and percentage bare soil decreased. With increasing soil moisture levels, plant cover increased and forest-floor light levels decreased. Fire frequency and soil moisture availability were positively correlated. Comparison of the fire data with published studies suggests that relationships between elevational gradients and fire may change in predictable ways from southern to northern latitudes in western North America. First axes of direct (DCCA) and indirect gradient analysis (DCA) showed a strong relationship between vegetation and variables correlated with elevation, including fire and resource variables such as light and soil moisture. Further variation in plant community composition was explained by a second axis that appeared to relate to variation in soil pH and soil texture, probably resulting from differences in parent material. The major environmental variables explaining axis 1 of the DCCA were the same as those found controlling the elevational distributions of tree species in separate single species studies.","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1994-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2997180","citationCount":"48","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of the Torrey Botanical Club","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2307/2997180","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 48
Abstract
BARTON, A. M. (Department of Biology, University of Michigan, Ann Arbor, MI 48109). Gradient analysis of relationships among fire, environment, and vegetation in a southwestern USA mountain range. Bull. Torrey Bot. Club 121: 251-265. 1994.-I investigated interrelationships among topography, resources/conditions, fire, and woody vegetation over the lower half of an elevational gradient, from arid lowlands to productive intermediate elevations, in the Chiricahua Mountains in southeastern Arizona. With increasing elevation, soil water potential, litter depth, organic carbon, canopy cover, and fire probability increased, whereas forest-floor light levels, soil temperature, pH, and percentage bare soil decreased. With increasing soil moisture levels, plant cover increased and forest-floor light levels decreased. Fire frequency and soil moisture availability were positively correlated. Comparison of the fire data with published studies suggests that relationships between elevational gradients and fire may change in predictable ways from southern to northern latitudes in western North America. First axes of direct (DCCA) and indirect gradient analysis (DCA) showed a strong relationship between vegetation and variables correlated with elevation, including fire and resource variables such as light and soil moisture. Further variation in plant community composition was explained by a second axis that appeared to relate to variation in soil pH and soil texture, probably resulting from differences in parent material. The major environmental variables explaining axis 1 of the DCCA were the same as those found controlling the elevational distributions of tree species in separate single species studies.
BARTON, A. M.(密西根大学生物系,密西根州安娜堡48109)。美国西南部山脉中火灾、环境和植被关系的梯度分析。公牛。托里机器人。俱乐部121:251-265。1994.我调查了地形、资源/条件、火灾和木本植被之间的相互关系,在海拔梯度的下半部分,从干旱的低地到多产的中间海拔,在亚利桑那州东南部的奇里卡华山脉。随着海拔的升高,土壤水势、凋落物深度、有机碳、冠层盖度和火灾概率增加,而森林地面光照水平、土壤温度、pH值和裸土百分比减少。随着土壤水分水平的增加,植物覆盖增加,森林地面光照水平降低。火灾频率与土壤水分有效性呈正相关。将火灾数据与已发表的研究进行比较表明,在北美西部,从南纬到北纬,海拔梯度与火灾之间的关系可能以可预测的方式发生变化。直接梯度分析(DCCA)和间接梯度分析(DCA)的第一轴显示植被与海拔相关变量(包括火灾和光照、土壤湿度等资源变量)之间存在较强的相关性。植物群落组成的进一步变化可以用第二个轴来解释,这个轴似乎与土壤pH和土壤质地的变化有关,可能是由母质的差异引起的。解释DCCA轴1的主要环境变量与在单独的单物种研究中发现的控制树种海拔分布的主要环境变量相同。