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Download Profile: SOIL CO2 FLUX FROM A TROPICAL DRYLAND RICE-BARLEY-FALLOW AGROECOSYSTEM: IMPACT OF APPLICATION ...


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Information on loss of carbon in form of CO2 from the soil in response to soil amendments is wanting in tropical dryland agroecosystems. This two year study of soil CO2 in tropical dryland agroecosystem supporting rice-barley-fallow annual sequence involved addition of equivalent amount of N through chemical fertilizer and three organic inputs (high quality resource, low quality resource, and high and low quality resource combined) besides control. A marked seasonal variation was noticed in CO2 flux in all treatments, with higher levels obtained during rice crop (warm-wet period) and considerably decreased flux during barley crop (cool dry, period). CO2 flux differed in various treatments. In terms of annual mean, low quality input showed 92% greater CO2 flux relative to control (127 mg CO2 m-2 hr-1) whereas combined input showed 75% increase. However, the CO2 flux expressed on the basis of per unit exogenous carbon added was ca.100 times higher in case of fertilizer relative to low quality input application (ca. 11 mg CO2 g-1 C hr-1) (cf. High quality input, 3 times, and combined input 1.5 times greater). These results show that CO2 flux is more related to C input than the input of N.


Author: N. Ghoshal, S. Singh, and K.P. Singh (n dot ghoshal at yahoo dot co dot in)
Filesize: 41.00 Kb


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     Talk History
Friday, September 30
· Discussion Panel
· Nitrogen Regulation of Carbon Sequestration in Terrestrial Ecosystems in Respons
· The Role of Water Relations in Driving Grassland Ecosystem Responses to Rising A
· Unraveling the Decline in High-latitude Surface Ocean Carbonate
Thursday, September 29
· Hazards of Temperature on Food Availability in Changing Environments (HOT-FACE)
· The Amazon and the Modern Carbon Cycle
· New Coupled Climate-carbon Simulations from the IPSL Model
· The Changing Carbon Cycle
· What are the Most Important Factors for Climate-carbon Cycle Coupling?
· CO2 Uptake of the Marine Biosphere
· European-wide Reduction in Primary Productivity Caused by the Heat and Drought i
· Persistence of Nitrogen Limitation over Terrestrial Carbon Uptake
· Atmospheric CO2, Carbon Isotopes, the Sun, and Climate Change over the Last Mill
· Proposing a Mechanistic Understanding of Atmospheric CO2 During the late Pleist
· Greenhouse Gas (CO2, CH4) and Climate Evolution since 650 kyrs Deduced from Anta
Wednesday, September 28
· (In and) Out of Africa: Estimating the Carbon Exchange of a Continent
· Recent Shifts in Soil Dynamics on Growing Season Length, Productivity, and...
· Interannual Variability in the Carbon Exchange Using an Ecosystem-fire Model
· Photosynthesis and Respiration in Forests in Response to Environmental Changes
· Seasonal and Interannual Variability in Net Ecosystem CO2 Exchange in Japan
· Estimating Landscape-level Carbon Fluxes from Tower CO2 Mixing Ratio Measurement
· Monitoring Effects in Climate and Fire Regime on Net Ecosystem Production
· Radiative Forcing from a Boreal Forest Fire
· The Influence of Soil and Water Management on Carbon Erosion and Burial
· Spatial and Temporal Patterns of CO2, CH4, and N2O Fluxes in Ecosystems
· Modeling the History of Terrestrial Carbon Sources and Sinks
· The Age of Carbon Respired from Terrestrial Ecosystems
· Discussion Panel
· The Underpinnings of Land Use History
Tuesday, September 27
· Regional CO2 Fluxes for North America Estimated from NOAA/CMDL Observatories

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The 7th International CO2 Conference

The Omni Interlocken Resort
September 25th - 30th
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