DOI: 10.1111/gcb.12163
论文题名: Regional scale patterns of fine root lifespan and turnover under current and future climate
作者: Luke McCormack M. ; Eissenstat D.M. ; Prasad A.M. ; Smithwick E.A.H.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 6 起始页码: 1697
结束页码: 1708
语种: 英语
英文关键词: Belowground
; Carbon allocation
; DISTRIB
; Dynamic global vegetation model (DGVM)
; Ecological modeling
; Minirhizotron
; Tree distribution
Scopus关键词: belowground production
; carbon
; carbon flux
; climate change
; ecological modeling
; ecosystem dynamics
; nutrient cycling
; resource allocation
; root
; temperate environment
; vegetation
; water uptake
; article
; climate
; physiology
; plant root
; theoretical model
; uncertainty
; United States
; Climate
; Models, Theoretical
; Plant Roots
; Uncertainty
; United States
; United States
英文摘要: Fine root dynamics control a dominant flux of carbon from plants and into soils and mediate potential uptake and cycling of nutrients and water in terrestrial ecosystems. Understanding of these patterns is needed to accurately describe critical processes like productivity and carbon storage from ecosystem to global scales. However, limited observations of root dynamics make it difficult to define and predict patterns of root dynamics across broad spatial scales. Here, we combine species-specific estimates of fine root dynamics with a model that predicts current distribution and future suitable habitat of temperate tree species across the eastern United States (US). Estimates of fine root lifespan and turnover are based on empirical observations and relationships with fine root and whole-plant traits and apply explicitly to the fine root pool that is relatively short-lived and most active in nutrient and water uptake. Results from the combined model identified patterns of faster root turnover rates in the North Central US and slower turnover rates in the Southeastern US. Portions of Minnesota, Ohio, and Pennsylvania were also predicted to experience >10% increases in root turnover rates given potential shifts in tree species composition under future climate scenarios while root turnover rates in other portions of the eastern US were predicted to decrease. Despite potential regional changes, the average estimates of root lifespan and turnover for the entire study area remained relatively stable between the current and future climate scenarios. Our combined model provides the first empirically based, spatially explicit, and spatially extensive estimates of fine root lifespan and turnover and is a potentially powerful tool allowing researchers to identify reasonable approximations of forest fine root turnover in areas where no direct observations are available. Future efforts should focus on reducing uncertainty in estimates of root dynamics by better understanding how climate and soil factors drive variability in root dynamics of different species. © 2013 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62420
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Ecosystem Science and Management, The Pennsylvania State University, 109 Tyson Building, University Park, PA 16802, United States; Intercollege Graduate Degree Program in Ecology, The Pennsylvania State University, 109 Tyson Building, University Park, PA 16802, United States; Northeastern Research Station, USDA Forest Service, 359 Main Road, Delaware, OH 43015, United States; Department of Geography, The Pennsylvania State University, 302 Walker Building, University Park, PA 16802, United States
Recommended Citation:
Luke McCormack M.,Eissenstat D.M.,Prasad A.M.,et al. Regional scale patterns of fine root lifespan and turnover under current and future climate[J]. Global Change Biology,2013-01-01,19(6)