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Ce exam part3 4

Ce exam part3 4






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    Ce exam part3 4 Ce exam part3 4 Presentation Transcript

    • JGSEE: The Joint Graduate School of Energy and Environment NO.2 NO.2 NO.2
    • 1. Introduction 1.1 Background 1.2 Objectives2. Materials and Methods 2.1 Study Site 2.2 Forest-DNDC Model 2.3 Model Input Parameters3. Results 3.1 Soil Carbon Dynamic 3.2 Soil CO2, N2O and NO Emission4. Conclusions
    • 1.1 Background The greenhouse gas (GHG) are believed that lead to global warming. The changes in temperature, precipitation and CO2 concentration readily affect the carbon inputs and decomposition, and the soil nitrogen transformations. Soil respiration would be increased by global warming. Then it can release more CO2 that further exacerbates the global warming. However, both “the impact of climate change on soil carbon dynamics” and “the feedbacks of soil carbon dynamics on climate” are currently controversial.
    • 1.2 ObjectivesIn order to unambiguously understand“the response of the Abies fabri forest ecosystem to the climate changes.”
    • 2.1 Study SiteThe forest located in Gongga Mountain (China)as subtropical monsoon climate.(Source: http://commons.wikimedia.org/wiki/Category:Abies_fabri) (Source: Map from Google Earth, 2009)
    • 2.2 Forest-DNDC Model FOREST-DNDC WETLAND-DNDC PnET-N-DNDCa hydrology-driven model an upland forest biogeochemical model (from photosynthesis and evapotranspiration – nitrification – denitrification and decomposition)
    • 2.3 Model Input Parameters The values of CO2 conc., temp. Parameters for this study and precipitationincluding: site latitude ambient CO2 conc.  Baseline (1990-1999) N conc. in precipitation  Climate change scenarios (2090-2099) daily climate data soil properties forest propertiesOther input parameters were model default values.
    • 3.1 Soil Carbon Dynamics SOC was determined by balance between litter inputs and heterotrophic respiration The forest floor pool Climate The increase of SOC Litterscenarios (kg C ha-1 yr -1) (kg C ha-1 yr-1) baseline 4111 4218 B1 4027 4125 A1B 3983 4076 A2 3940 4028 The mineral soil pool Climate The increase of SOC Litter scenarios (kg C ha-1 yr -1) (kg C ha-1 yr-1) baseline 2220 2105 B1 2235 2038 A1B 2244 2003 A2 2247 1975
    • 3.2 Soil CO2, N2O and NO Emission Soil CO2 emissionThe GHGs emission was the highest when Temp. and precipitation were the highest.
    • 3.2 Soil CO2, N2O and NO EmissionsSoil N2O and NO emission
    • Conclusions The IPCC climate scenarios substantially affect the soil carbon dynamics and GHG emissions in the A. fabri forest ecosystem. The Forest-DNDC simulation showed that the soil-borne GHG emissions increased significantly with rising temperature and precipitation. Compared with GHG emissions, the response of soil carbon dynamics to climate change was relatively less pronounced.