dragon 2 id 5319 the role of croplands and grasslands in the carbon budget of china thuy le toan
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Dragon 2 ID 5319 The role of croplands and grasslands in the carbon budget of China Thuy Le Toan Centre d’Etudes Spatiales de la Biosphère (CESBIO) Toulouse, France [email protected]. Huang Yao (PI), Zhang Wen, Sun Wenjuan Institute of Atmospheric Physics, CAS, Beijing - PowerPoint PPT PresentationTRANSCRIPT
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Dragon 2 ID 5319The role of croplands and grasslands in
the carbon budget of China
Thuy Le ToanCentre d’Etudes Spatiales de la Biosphère (CESBIO)
Toulouse, [email protected]
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Thuy Le Toan (PI),
CESBIO,Toulouse, FranceShaun Quegan (PI)CTCD,Sheffield, UK
Li Bingbai, Yang Shenbin, Wang Zhiming
Institute of Agriculture Resources and Environment, JAAS, Nanjing ( China)
Alberte BondeauInstitute for Climate Research (PIK), Potsdam (Germany)
Michael BuchwitzIUP Bremen (Germany)
Wang Xiaoqin, Wang Qinmin, Jiang Hong, Chen YunzhiFuzhou University, China
He GuojinChina RS Satellite Ground Station, Beijing, China
Huang Yao (PI), Zhang Wen, Sun Wenjuan
Institute of Atmospheric Physics, CAS, Beijing
Tan Bingxiang (PI), Ling Feilong, Bai Lina, Li Shimming, CAF, Beijing
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Fossil fuel CO2 emissions in China have increased from 0.4 PgC/yr in 1980 to 1.5 PgC/yr in 2006.
According to a recent study (Piao et al., Nature, 2009) China’s terrestrial ecosystems absorbed 28–37 per cent of its cumulated fossil carbon emissions during the 1980s and 1990s.
Quantifying the carbon balance of Chinese ecosystems is necessary not only to assess the magnitude of the Northern Hemispheric and global sinks, but also to define new objectives for the management of terrestrial ecosystems to slow the rate of CO2 growth.
Background
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Much attention has been paid to the contribution of forest ecosystems to the carbon sink, while less attention has been paid to the other ecosystems.
However, it is recognized that agricultural management can play an important role in mitigation climate change by increasing carbon storage in soils and reducing methane emission from rice cultivation.
Background
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
To contribute to understanding the role of vegetation ecosystems (croplands, grasslands and forests) in the C budget of China, by developing approach combining EO, models, in situ and historical data, to provide:
Spatial distribution of land use/land cover and their
changes over time
Seasonal and inter-annual variation of vegetation phenology, NPP, NEE
CH4 and CO2 fluxes
Project Objectives
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Model estimates of C budget
Soils
EO dataLand coverLand parameters (NDVI,
phenology, crop calendar, …)
Ecological switches (Freeze-thaw, Soil moisture indicator, …)
Climate
Models
C budget
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Northeast China
Jiangsu
Fujian
Qinghai-Tibet
Plateau
Test regions
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Main ResultsI. EO methodology development:
- Rice monitoring at regional scale - Land cover at province scale- Phenology in cold region
II. Model development - LPJ mL: carbon- Agro-C: carbon- CH4MOD: rice and wetland methane
III. Preliminary EO-Model integration
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Climate change in Qinghai-Tibet Plateau
Temperature increased, precipitation decreased
-12
-10
-8
-6
-4
-2
0
1975 1980 1985 1990 1995 2000 2005 2010
Year
Air
tem
pera
ture
(℃
)
300
400
500
600
700
800
Annual pre
cipit
ati
on (
mm
)
Temperature
Precipitation
Frost days decreased
(Liu et al., 2003, JGR)
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
SPOT VEGETATION DATAMean NDVI 2007
Lanzhou
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Leaf appearance = date when NDWI starts to increase
In situ Leaf appearanceIn situ Leaf appearanceIn situ Snow meltIn situ Snow melt
DOYDOY
Date of greening in cold regions NIR-SWIRNIR-SWIRNDWI=--------------NDWI=-------------- NIR+SWIRNIR+SWIR
Phenology in Qinghai-Tibet
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
DOY
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
March
July
Dates of beginning of greening in Qinghai-Tibet
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Phenology in cold regionsDates of beginning of greening in Qinghai Tibet
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Red: October 8th ; Green: August 18th ; Blue: October 27th , Jiangsu province. ASAR WSM data
EO : Rice mapping
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Magenta: 20060705 Green: 20060809Magenta: 20060702 Green: 20060806Magenta: flooded rice fieldsGreen: fields with temporary drainage
(ASAR WideSwath VV)Mapping of mid season drainageEO : monitoring of irrigation
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Increase in N use promoted NPP production
Model AGRO-C: Progress and primary resultsWheat/Maize rotation in North China Plain
0.10
0.12
0.14
0.16
0.18
0.20
0.22
0.24
12
/01
12
/31
01
/30
03
/01
03
/31
04
/30
05
/30
06
/29
07
/29
08
/28
09
/27
10
/27
11
/26
12
/26
01
/25
Date (MM/DD)
ND
VI
Mean of 1996-2000Mean of 1981-1985
g C/m2
g C/m2
Hebei Province Mean of
1981-1985 Mean of
1996-2000 Increased
Accumulated >10℃ T (℃·d)
4561 4742 181
N for wheat (kg/ha) 105 198 93
Wheat NPP (tC/ha) 3.35 4.66 1.31
Simulated changes in crop NPP
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Single crop in Northeastern China
0.10
0.12
0.14
0.16
0.18
0.20
0.22
0.24
12
/01
12
/31
01
/30
03
/01
03
/31
04
/30
05
/30
06
/29
07
/29
08
/28
09
/27
10
/27
11
/26
12
/26
01
/25
Date (MM/DD)N
DV
I
Mean of 1996-2000Mean of 1981-1985
g C/m2
g C/m2
Heilongjiang Province
Mean of 1981-1985
Mean of 1996-2000
Increased
Accumulated >10℃ T (℃·d)
2704 2847 143
Rice area (Mha) 0.28 1.46 1.18
Rice NPP (tC/ha) 3.3 5.5 2.2
Global warming has resulted in a significant northward expansion of rice planting in northeast China.
Simulated changes in crop NPPbetween 1980 and 2000 by using Agro-C
Model AGRO-C: Progress and primary results
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
CH4MOD: Progress and primary results
y = 0.167x - 325
(R 2 = 0.95)
y = 0.054x - 101
(R 2 = 0.79)
2
3
4
5
6
7
8
1950
1960
1970
1980
1990
2000
2010
CH
4 em
issi
on (
Tg/
yr)
Estimated CH4 emission from Chinese rice paddies over the
period of 1955―2005
Spatial distribution of CH4
emission from Chinese rice paddies (mean of 1990―1999)
(Wang P, Huang Y, Zhang W, Adv. Clim. Change Res.,2009)
7 September 2010 Lecture D2L3e CO2 in crolands Thuy Le Toan
Average over 2001-2005
SCIAMACHY CH4 and modelled rice paddy CH4