博士论文答辩－基于过程的中国陆地生态系统生产力和蒸散遥感研究

Simulating NPP and ET of Terrestrial Ecosystem in China using BEPS Model,Xianfeng Feng, Gaohuan Liu, Jing Chen, Jane Liu, Mingzhen Chen, Weimin Ju, Wenzuo Zhou,IGSNRR of CAS, ChinaUniversity of Toronto, Canada,Presentation Outline,OverviewData collection & data processSimulating NPP and ET using BEPS model Tempor-spatial analysis of NPP and ET in ChinaFactors sensitivity of NPP and ETDiscussion and conclusion,Instruction,What,?,Estimation NPP and ET of terrestrial ecosystem in ChinaAnalysis the temporal-spatial distribution of NPP and ET in China,Using BEPS modelBased on Remote sensing and GIS,The scheme about research,Data processing,Improving BEPS,Simulating,Analysis,BEPS model for China,Improving BEPS model soil temperature soil respiration soil T Air T + Precipitation soil T Meteorology module Interpolation Smoothing Thin Plate Spline DEM data Arithmetic for meteorological data Biophysics Parameters for kinds of vegetation,Data process-collection,Data collection Remote Sensing data LAI, Land use, land cover Observation data Climate data ( daily, Tmax, Tmin, Pre, Hum,Rad) Validation data (LAI, biomass, NPP) PG data (Physical geographical data)Vegetation, Soil, DEM other data,Data Fusion Land use vegetation land cover data Flow work of fusion Land cover,Data process- data fusion,Flow Work,Land cover map of China in 2001,Legend,Data Process-estimation,Soil data AWC data soi water data Biomass Model Bio:biomass; X: LAI; A and B are parameters for vegetation. Validation,Forest Biomass,Biomass, AWC and soil water,Soil water,AWC,Data Process-Interpolation,Weather StationsInterpolation ANUSPLIN ( Smoothing thin plate Spline + DEM)Grid meteorological data,Weather Stations,Weather stations in China, 2001,StationBoundary for Province,Legend,Simulating NPP and ET,Input data (1km) Meteorological data (1 day)Tmax、Tmin、Precip、RH 、Snowpack 、Rad LAI ( 8 days) Biomass ( 2001) Land cover( 2001) Soil data ( 2001)AWC, Soil water Biophysical parameters Model - BEPS model output data GPP, NPP, RES ET, E,T,Simulating NPP and ET-Validation (1),Methods Sites validation：Changbaishan、liping、Xingguo、Baoying、Heihe Sample plots validation：1000 plots (80S2000)Sites validation (Changbaishan Case) Step 1: Measurements and survey LAI,Biomass and NPP form measurements step 2: Modeling and simulatingLAI, Biomass and NPP from Remote sensing step 3:Comparison BEPS-TM BEPS-MODIS,BEPS-TM,BEPS-MODIS,Site Validation (Changbaishan site),Simulating NPP and ET-Validation (2),Sample plots validation 1000 around sample plots （Forest） Yield validation ( crop )Yield total plant weight dry material weight NPP（C） samples plots + other simulating NPP (bush, grass),Simulating NPP and ET-Validation (3),Terrestrial ecosystem: good Forest ecosystem: very good Crop ecosystem: ? Find error LAI data BEPS,GPP,NPP,RES OF 2001,NPP of China in 2001 for land cover,Comparison with other simulating NPP,ET of China in 2001,Evaporation of China in 2001,ET, E and T of China in 2001,Transpiration of China,Percentage of E/ET,Precipitation - ET,ET of China in 2001 for Land cover,NPP and ET in compositive physical region,Temporal-spatial distribution of NPP and ET,Temporal distribution of NPP and ET per 30 days per 10days per 1 day Spatial distribution of NPP and ET for Longitude for Latitude for Altitude,Monthly LAI in 2001,Terrestrial LAI,Forest LAI,Month,Monthly NPP in 2001,Legend(Unit: gC/m2.MO),NPP in 2001,gC/m2.Mo,tow Peak-value crop In summer, resporation is very high, but the GPP cant increase because of drought,Monthly ET in 2001,Legend(Unit: mm/MO),ET in 2001,Peak-value in August middle-July : a little low,gC/m2.a,Mean LAI、NPP and ET for Latitude,Latitude,Terrestrial NPP,Forest NPP,Mean LAI、NPP and ET for Longitude,gC/m2.a,Terrestrial NPP,Forest NPP,Long.,Mean LAI、NPP and ET for Altitude,Mean LAI,Mean ET,Mean NPP,Altitude Zone,Factors Sensitivity-1,Factors LAI Meteorological factors Air Temperature Precipitation Solar radiation VPD AWC How LAI、Precipitation、Radiation、VPD ： 20 Temperature： 1 AWC： 20mm,Sensitivity analysis on input data and some parameters in the model,Discussion and Conclusion,Total NPP of China is 2.235 GtC/yr in 2001 Mean NPP of China is 235.2gC/m2yr in 2001Mean ET of China is 418.81mm/yr in 2001, percentage of ET to precipitation is 78.5% LAI data is the major error resource for NPP and ET,ACKNOWLEDGMENT,We are ve