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Dragon 2 ID 5319 The role of croplands and grasslands in the carbon budget of China Thuy Le Toan

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 Thuy.Letoan@cesbio.cnes.fr. Huang Yao (PI), Zhang Wen, Sun Wenjuan Institute of Atmospheric Physics, CAS, Beijing

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Dragon 2 ID 5319 The role of croplands and grasslands in the carbon budget of China Thuy Le Toan

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  1. 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 Thuy.Letoan@cesbio.cnes.fr

  2. Huang Yao (PI), Zhang Wen, Sun Wenjuan Institute of Atmospheric Physics, CAS, Beijing Tan Bingxiang (PI), Ling Feilong, Bai Lina, Li Shimming, CAF, Beijing Thuy Le Toan (PI), CESBIO,Toulouse, France Shaun Quegan (PI) CTCD,Sheffield, UK Li Bingbai, Yang Shenbin, Wang Zhiming Institute of Agriculture Resources and Environment, JAAS, Nanjing ( China) Alberte Bondeau Institute for Climate Research (PIK), Potsdam (Germany) Michael Buchwitz IUP Bremen (Germany) Wang Xiaoqin, Wang Qinmin, Jiang Hong, Chen Yunzhi Fuzhou University, China He Guojin China RS Satellite Ground Station, Beijing, China

  3. Background • 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.

  4. Background • 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.

  5. Project Objectives 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

  6. Models Climate Soils • EO data • Land cover • Land parameters (NDVI, phenology, crop calendar, …) • Ecological switches (Freeze-thaw, Soil moisture indicator, …) C budget Model estimates of C budget

  7. Test regions Northeast China Qinghai-Tibet Plateau Jiangsu Fujian

  8. Main Results • I. 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 • Preliminary EO-Model integration

  9. Temperature increased, precipitation decreased Frost days decreased (Liu et al., 2003, JGR) Climate change in Qinghai-Tibet Plateau

  10. Lanzhou SPOT VEGETATION DATA Mean NDVI 2007

  11. Phenology in Qinghai-Tibet NIR-SWIR NDWI=-------------- NIR+SWIR Date of greening in cold regions In situ Leaf appearance In situ Snow melt DOY Leaf appearance = date when NDWI starts to increase

  12. DOY

  13. Dates of beginning of greening in Qinghai-Tibet July March

  14. Phenology in cold regions Dates of beginning of greening in Qinghai Tibet

  15. EO : Rice mapping Red: October 8th ; Green: August 18th ; Blue: October 27th , Jiangsu province. ASAR WSM data

  16. EO : monitoring of irrigation (ASAR WideSwath VV) Mapping of mid season drainage Magenta: 20060702 Green: 20060806 Magenta: 20060705 Green: 20060809 Magenta: flooded rice fields Green: fields with temporary drainage

  17. Model AGRO-C: Progress and primary results Simulated changes in crop NPP Increase in N use promoted NPP production

  18. Model AGRO-C: Progress and primary results Simulated changes in crop NPP between 1980 and 2000 by using Agro-C Global warming has resulted in a significant northward expansion of rice planting in northeast China.

  19. CH4MOD: Progress and primary results Spatial distribution of CH4 emission from Chinese rice paddies (mean of 1990―1999) Estimated CH4 emission from Chinese rice paddies over the period of 1955―2005 (Wang P, Huang Y, Zhang W, Adv. Clim. Change Res.,2009)

  20. Average over 2001-2005 SCIAMACHY CH4 and modelled rice paddy CH4

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