DOI: 10.1111/gcb.12477
论文题名: Mortality of resprouting chaparral shrubs after a fire and during a record drought: Physiological mechanisms and demographic consequences
作者: Pratt R.B. ; Jacobsen A.L. ; Ramirez A.R. ; Helms A.M. ; Traugh C.A. ; Tobin M.F. ; Heffner M.S. ; Davis S.D.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 3 起始页码: 893
结束页码: 907
语种: 英语
英文关键词: Adenostoma
; Carbohydrate starvation
; Cavitation
; Ceanothus
; Chamise
; Wildfire
; Xylem
Scopus关键词: abundance
; carbohydrate
; carbon dioxide
; chaparral
; community composition
; demography
; drought
; mortality
; physiology
; population density
; resprouting
; shrub
; wildfire
; xylem
; water
; Adenostoma
; article
; carbohydrate metabolism
; carbohydrate starvation
; cavitation
; Ceanothus
; chamise
; drought
; fire
; fogo selvagem
; metabolism
; physiology
; plant physiology
; plant stoma
; plant tuber
; United States
; xylem
; Adenostoma
; carbohydrate starvation
; cavitation
; Ceanothus
; chamise
; wildfire
; xylem
; California
; Carbohydrate Metabolism
; Droughts
; Fires
; Plant Physiological Processes
; Plant Stomata
; Plant Tubers
; Water
; Xylem
英文摘要: We examined postfire regeneration of chaparral shrubs during an intense drought. This study focused on the demography and physiology of shrub species that resprout from a basal lignotuber following fire. We found significant levels of resprout mortality when intense drought occurred in the year following fire during the period of shrub recovery. Three of the seven sampled resprouting species had the greatest or near greatest levels of mortality ever recorded when compared to previous studies. Most shrub mortality occurred during the drought after individuals had resprouted (i.e. individuals survived fire, resprouted and then subsequently died). Physiological measurements of species with high mortality suggested that resprout stems were highly embolized and xylem hydraulic conductivities were close to zero during the peak of the drought. In addition, lignotubers of two of the three species experiencing high mortality were depleted of starch. Population densities of most shrub species declined after the drought compared with their prefire levels, with the exception of one drought tolerant obligate seeding species. Resprouting shrub species may deplete their carbohydrate reserves during the resprouting process, making them particularly vulnerable to drought because of the need to transpire water to acquire the CO2 that is used to supply energy to a large respiring root system. Drought appears to interact with fire by altering postfire shrub recovery and altering species abundances and composition of chaparral communities. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61967
Appears in Collections: 影响、适应和脆弱性
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作者单位: California State University, 9001 Stockdale Highway, Bakersfield, CA 93311, United States; UC Berkeley, Berkeley, CA 94720, United States; Pepperdine University, 24255 Pacific Coast Highway, Malibu, CA 90263, United States; University of Houston, Downtown, 1 Main St, Houston, TX 77002, United States
Recommended Citation:
Pratt R.B.,Jacobsen A.L.,Ramirez A.R.,et al. Mortality of resprouting chaparral shrubs after a fire and during a record drought: Physiological mechanisms and demographic consequences[J]. Global Change Biology,2014-01-01,20(3)