DOI: 10.1111/gcb.12743
论文题名: Grassland to shrubland state transitions enhance carbon sequestration in the northern Chihuahuan Desert
作者: Petrie M.D. ; Collins S.L. ; Swann A.M. ; Ford P.L. ; Litvak M.E.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 3 起始页码: 1226
结束页码: 1235
语种: 英语
英文关键词: Carbon sequestration
; Chihuahuan Desert
; Creosotebush shrubland
; Desert grassland
; Ecological state transition
; Ecosystem services
Scopus关键词: carbon cycle
; carbon sequestration
; carbon sink
; ecosystem service
; environmental conditions
; grassland
; respiration
; shrubland
; Chihuahuan Desert
; Larrea
; carbon
; carbon cycle
; carbon sequestration
; chemistry
; desert climate
; ecosystem
; grassland
; season
; United States
; Carbon
; Carbon Cycle
; Carbon Sequestration
; Desert Climate
; Ecosystem
; Grassland
; New Mexico
; Seasons
英文摘要: The replacement of native C4-dominated grassland by C3-dominated shrubland is considered an ecological state transition where different ecological communities can exist under similar environmental conditions. These state transitions are occurring globally, and may be exacerbated by climate change. One consequence of the global increase in woody vegetation may be enhanced ecosystem carbon sequestration, although the responses of arid and semiarid ecosystems may be highly variable. During a drier than average period from 2007 to 2011 in the northern Chihuahuan Desert, we found established shrubland to sequester 49 g C m-2 yr-1 on average, while nearby native C4 grassland was a net source of 31 g C m-2 yr-1 over this same period. Differences in C exchange between these ecosystems were pronounced - grassland had similar productivity compared to shrubland but experienced higher C efflux via ecosystem respiration, while shrubland was a consistent C sink because of a longer growing season and lower ecosystem respiration. At daily timescales, rates of carbon exchange were more sensitive to soil moisture variation in grassland than shrubland, such that grassland had a net uptake of C when wet but lost C when dry. Thus, even under unfavorable, drier than average climate conditions, the state transition from grassland to shrubland resulted in a substantial increase in terrestrial C sequestration. These results illustrate the inherent tradeoffs in quantifying ecosystem services that result from ecological state transitions, such as shrub encroachment. In this case, the deleterious changes to ecosystem services often linked to grassland to shrubland state transitions may at least be partially offset by increased ecosystem carbon sequestration. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61879
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology, University of New Mexico, Albuquerque, NM, United States; Department of Biology, Sevilleta LTER, University of New Mexico, Albuquerque, NM, United States; USDA Forest Service, Rocky Mountain Research Station, Albuquerque, NM, United States
Recommended Citation:
Petrie M.D.,Collins S.L.,Swann A.M.,et al. Grassland to shrubland state transitions enhance carbon sequestration in the northern Chihuahuan Desert[J]. Global Change Biology,2015-01-01,21(3)