DOI: 10.1111/gcb.14107
Scopus记录号: 2-s2.0-85044249318
论文题名: Detecting early warning signals of tree mortality in boreal North America using multiscale satellite data
作者: Rogers B.M. ; Solvik K. ; Hogg E.H. ; Ju J. ; Masek J.G. ; Michaelian M. ; Berner L.T. ; Goetz S.J.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 6 起始页码: 2284
结束页码: 2304
语种: 英语
英文关键词: browning
; dieback
; drought
; inventory
; NDVI
; pests and pathogens
; productivity
Scopus关键词: detection method
; dieback
; drought
; early warning system
; global change
; mortality
; NDVI
; pathogen
; satellite data
; North America
英文摘要: Increasing tree mortality from global change drivers such as drought and biotic infestations is a widespread phenomenon, including in the boreal zone where climate changes and feedbacks to the Earth system are relatively large. Despite the importance for science and management communities, our ability to forecast tree mortality at landscape to continental scales is limited. However, two independent information streams have the potential to inform and improve mortality forecasts: repeat forest inventories and satellite remote sensing. Time series of tree-level growth patterns indicate that productivity declines and related temporal dynamics often precede mortality years to decades before death. Plot-level productivity, in turn, has been related to satellite-based indices such as the Normalized difference vegetation index (NDVI). Here we link these two data sources to show that early warning signals of mortality are evident in several NDVI-based metrics up to 24 years before death. We focus on two repeat forest inventories and three NDVI products across western boreal North America where productivity and mortality dynamics are influenced by periodic drought. These data sources capture a range of forest conditions and spatial resolution to highlight the sensitivity and limitations of our approach. Overall, results indicate potential to use satellite NDVI for early warning signals of mortality. Relationships are broadly consistent across inventories, species, and spatial resolutions, although the utility of coarse-scale imagery in the heterogeneous aspen parkland was limited. Longer-term NDVI data and annually remeasured sites with high mortality levels generate the strongest signals, although we still found robust relationships at sites remeasured at a typical 5 year frequency. The approach and relationships developed here can be used as a basis for improving forest mortality models and monitoring systems. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110382
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Woods Hole Research Center, Falmouth, MA, United States; Northern Forestry Centre, Canadian Forest Service, Natural Resources Canada, Edmonton, AB, Canada; Biospheric Science Laboratory (Code 618), NASA Goddard Space Flight Center, Greenbelt, MD, United States; School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, AZ, United States
Recommended Citation:
Rogers B.M.,Solvik K.,Hogg E.H.,et al. Detecting early warning signals of tree mortality in boreal North America using multiscale satellite data[J]. Global Change Biology,2018-01-01,24(6)