DOI: 10.1016/j.foreco.2014.05.023
Scopus记录号: 2-s2.0-84902436372
论文题名: Stand age effects on Boreal forest physiology using a long time-series of satellite data
作者: Croft H. ; Chen J.M. ; Noland T.L.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 328 起始页码: 202
结束页码: 208
语种: 英语
英文关键词: LAI
; Landsat
; Leaf chlorophyll
; Reflectance
; Remote sensing
Scopus关键词: Biochemistry
; Budget control
; Carbon
; Forestry
; Reflection
; Remote sensing
; Satellites
; LAI
; LANDSAT
; Leaf chlorophyll
; Leaf chlorophyll content
; Net primary production
; Reduced simple ratio
; Spectral vegetation indices
; Structural parameter
; Chlorophyll
; age class
; boreal forest
; chlorophyll
; chronosequence
; climate change
; coniferous forest
; forest management
; harvesting
; Landsat
; net primary production
; photosynthesis
; physiological response
; phytochemistry
; satellite data
; stand structure
; time series
; Biochemistry
; Carbon
; Chlorophylls
; Cost Control
; Leaves
; Reflectance
; Remote Sensing
; Satellites
; Canada
; Ontario [Canada]
英文摘要: Many ecosystem variables and processes show a relationship with stand age, including leaf area index (LAI), nutrient and water cycling, biomass production and photosynthesis. However, investigations into stand age dependency have typically focused on stand structure, and are limited by the availability of measurement sites. This study uses a measured chronosequence of 9 sites, ranging in age from 15 to 90years, supported by a time-series of satellite-derived data to further validate temporal trends in LAI and leaf chlorophyll values. Managed Pinus banksiana stands in Northern Ontario, Canada were sampled for canopy structural parameters (LAI, stand density, crown radius, tree height) and leaf biochemistry (Chlorophyll a+b). Landsat 5TM (30m) data was obtained from 1989 to 2011 and chlorophyll- (Revised Transformed Chlorophyll absorption ratio index; RTCARI) and LAI- (Reduced Simple Ratio; RSR) sensitive spectral vegetation indices (VI) were calculated. Stand age showed strong relationships with tree height (R2=0.95, p<0.001), canopy radius (R2=0.68; p<0.01) and with stand density (R2=0.49; p<0.01). The measured LAI and leaf chlorophyll chronosequence showed an excellent correspondence with the VI-derived LAI and chlorophyll over time, modelled from the satellite archive. The temporal dependency of LAI and leaf chlorophyll with stand age was quantified through the fitting of a spherical model (chlorophyll=44years; LAI=22years), after which further increases in forest age did not increase leaf chlorophyll or LAI. Variation in the temporal lags indicates differences in the maturation period for leaf biochemistry and canopy physical structure, with LAI likely related to a reduction in stand density. The demonstrated stand age-dependency of leaf chlorophyll content is crucial for understanding stand age effects on photosynthetic processes and carbon assimilation, both for quantifying net primary production (NPP) within carbon budgets and for guiding forest management and harvesting strategies in light of a changing climate. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65869
Appears in Collections: 影响、适应和脆弱性
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作者单位: University of Toronto, Department of Geography, Toronto, ON M5S 3G3, Canada; Ontario Ministry of Natural Resources, Ontario Forest Research Institute, 1235 Queen St. E., Sault Ste. Marie, ON P6A 2E5, Canada
Recommended Citation:
Croft H.,Chen J.M.,Noland T.L.. Stand age effects on Boreal forest physiology using a long time-series of satellite data[J]. Forest Ecology and Management,2014-01-01,328