DOI: 10.1016/j.jag.2016.07.009
Scopus记录号: 2-s2.0-84997796791
论文题名: A long-term simulation of forest carbon fluxes over the Qilian Mountains
作者: Yan M ; , Tian X ; , Li Z ; , Chen E ; , Li C ; , Fan W
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2016
卷: 52 起始页码: 515
结束页码: 526
语种: 英语
英文关键词: Biome-BGC model
; Dendrochronological data
; Eddy covariance
; MODIS GPP model
Scopus关键词: carbon flux
; dendrochronology
; eddy covariance
; forest ecosystem
; MODIS
; remote sensing
; simulation
; China
; Qilian Mountains
英文摘要: In this work, we integrated a remote-sensing-based (the MODIS MOD_17 Gross Primary Productivity (GPP) model (MOD_17)) and a process-based (the Biome-BioGeochemical Cycles (Biome-BGC) model) ecological model in order to estimate long-term (from 2000 to 2012) forest carbon fluxes over the Qilian Mountains in northwest China, a cold and arid forest ecosystem. Our goal was to obtain an accurate and quantitative simulation of spatial GPP patterns using the MOD_17 model and a temporal description of forest processes using the Biome-BGC model. The original MOD_17 model was first optimized using a biome-specific parameter, observed meteorological data, and reproduced fPAR at the eddy covariance site. The optimized MOD_17 model performed much better (R2 = 0.91, RMSE = 5.19 gC/m2/8d) than the original model (R2 = 0.47, RMSE = 20.27 gC/m2/8d). The Biome-BGC model was then calibrated using GPP for 30 representative forest plots selected from the optimized MOD_17 model. The calibrated Biome-BGC model was then driven in order to estimate forest GPP, net primary productivity (NPP), and net ecosystem exchange (NEE). GPP and NEE were validated against two-year (2010 and 2011) EC measurements (R2 = 0.79, RMSE = 1.15 gC/m2/d for GPP; and R2 = 0.69, RMSE = 1.087 gC/m2/d for NEE). NPP estimates from 2000 to 2012 were then compared to dendrochronological measurements (R2 = 0.73, RMSE = 24.46 gC/m2/yr). Our results indicated that integration of the two models can be used for estimating carbon fluxes with good accuracy and a high temporal and spatial resolution. Overall, NPP displayed a downward trend, with an average rate of 0.39 gC/m2/yr, from 2000 and 2012 over the Qilian Mountains. Simulated average annual NPP yielded higher values for the southeast as compared to the northwest. The most positive correlative climatic factor to average annual NPP was downward shortwave radiation. The vapor pressure deficit, and mean temperature and precipitation yielded negative correlations to average annual NPP. © 2016 The Author(s) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80060
Appears in Collections: 气候变化事实与影响
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作者单位: Research Institute of Forest Resource Information Techniques, Chinese Academy of Forestry, Yiheyuanhou, Beijing, China; College of Forestry, Southwest Forestry University, Baiyunsi Street 300, Kunming, China; Key Laboratory of Spatial Data Mining & Information Sharing of Ministry Education, Fuzhou University, Gongye Road 523, Fuzhou, China
Recommended Citation:
Yan M,, Tian X,, Li Z,et al. A long-term simulation of forest carbon fluxes over the Qilian Mountains[J]. International Journal of Applied Earth Observation and Geoinformation,2016-01-01,52