Simulating NPP and ET of Terrestrial Ecosystem in China using BPES Model

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???????????????????????Simulating NPP and ET
of Terrestrial Ecosystem in China using BPES
Model

• Xianfeng Feng Gaohuan Liu Jing Minh
  Chen
• Jane Liu Mingzhen Chen Weimin Ju
  Wenzuo Zhou
• Institute of Geographical Science and Natural
  Resource Research, China
• University of Toronto, Canada

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Outline ??

• 1. Introduction
• 2. Model and Methods
• 3. Data
• 4. Simulating
• 5. Analysis
• 6. Discussion and Conclusion

??????????????? Confronting Global Warming
Enhancing Chinas Capacity for Carbon
Sequestration
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1. Introduction ??
Introduction

• Objects
• Estimation NPP and ET of terrestrial ecosystem in
  China
• Analysis the temporal-spatial distribution of NPP
  and ET in China
• Methods
• Using BEPS model
• Based on Remote sensing and GIS

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The Scheme about Research ????
Data Processing
Improving BEPS
Simulating
Analysis
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BEPS Model for China
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Model
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CO2
H2O
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CO2
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H2O
CO2
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The structure of BEPS model
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Database ??????

• Input data for BEPS model
• Coordinate system, spatial resolution, temporal
  resolution
• Data
• Meteorological data 1day, 1km
• LAI data8day,1km
• Biomass1 year (2001), 1km
• Land Cover 1 year (2001), 1km
• AWC, soil water 1km
• Plant Parameters
• Stomatal Conductance, Specific Leaf Area
• Validation Database
• Biomass
• LAI
• NPP

Data
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Data Fusion
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Validation modification
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Table Model
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Simulated data
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(No Transcript)
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Tmin
Tmax
Interpolation (ANUSPLIN)
Weather Stations
Precitation
Relative Humidity

 
Snowpack in 1 DOY
Radiation
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Simulating-methods and Step ?????
Test

• Simulating Validation ?
  Simulating
• (Multi-scale) (Multi-scale)
  (National Wide)

• Input data
• Input data and parameters data
• Model- BEPS
• Output
• Images NPP, GPP, RA, ET, E,T
• Scale 1km ,1day, ten-day, month

Simulating
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Validation for NPP and ET

• Method
• Sites Changbai?Liping, Xingguo, Heihe
• Nationalabout 1000 plots,focus on forest
  ecosystem
• Site Validation
• Step 1 Measurements and survey
• LAI,Biomass and NPP form measurements
• step 2 Modeling and simulating
• LAI, Biomass and NPP from Remote sensing
• step 3Comparison
• BEPS-TM ? BEPS-MODIS

Simulating
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Site Validation (Changbaishan site)
BEPS-TM
BEPS-MODIS
Simulating
???????,?????NPP??,???????????,?BEPS-MODIS????????
??ET??,??????????????????????????????????TM?MODIS
???????????,?????????????????????BEPS-China???????
?????????NPP?ET?
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Sample plots validation (National wide)

• Sample plots validation (National wide)
• 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
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Simulated NPP in 2001
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NPP of China in 2001 for land cover
Simulating
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Simulating ET in 2001
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ET of China in 2001 for land cover
Simulating
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Analysis Factors Sensitivity

• Factors
• LAI
• Meteorological factors
• Air Temperature
• Precipitation
• Solar radiation
• VPD
• AWC
• How
• LAI?Precipitation?Radiation?VPD 20
• Temperature 1?
• AWC 20mm

Analysis
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AWC20mm
LAI20
T 1?
Pre20
Rad 20
VPD 20
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Analysis Factors Sensitivity
Analysis

• ????????????ET?????,????????LAI?
• ?????????????

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Monthly LAI in 2001
Analysis
Terrestrial LAI
Forest LAI
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Monthly NPP in 2001
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NPP in 2001 (Monthly)

• tow Peak-value
• crop
• In summer, respiration is very high, but the GPP
  cant increase because of drought

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Monthly ET in 2001
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ET in 2001

• Peak-value in August
• middle-July a little low

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Mean LAI?NPP and ET for Latitude
Analysis
Terrestrial NPP
Forest NPP
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Mean LAI?NPP and ET for Longitude
Analysis
Terrestrial NPP
Forest NPP
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Mean LAI?NPP and ET for Altitude
Altitude Zone
Analysis
Mean LAI
Mean ET
Mean NPP
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Discussion and Conclusion

• NPP of Terrestrial Ecosystem in 2001
• Total2.235GtC
• Forest ecosystem 0.922GtC,Percentage is 42 for
  whole terrestrial ecosystem
• Mean235.2gC/m2yr
• Percentage NPP/GPP50.6
• NPP value is very different for different land
  cover
• ET of Terrestrial Ecosystem in 2001
• Mean418.81 mm/yr
• Percentage ET/Precipitation78.5
• ET value is very different for different land
  cover

Concussion
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Thank you!