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China University (2009)

The CO2 Flux Of Soils And The CO2 Concentration Of Surface Layer At Arid Region In Temperate Zone

Gao C D

Titre : The CO2 Flux Of Soils And The CO2 Concentration Of Surface Layer At Arid Region In Temperate Zone

Auteur : Gao C D

Grade : Doctoral Dissertation 2009

Université : China University

Résumé partiel
The impact of golbal warming on human survival and sustainable development is a global major issue,which goes beyond science and technology and penetrates into political, economic,diplomatic,cultural educational and other areas of society.However,there are some things unknown in greenhouse gases "sources" or "sinks" in circles of the Earth.The "missing carbon sink" mystery has not yet been answered.Compared top to the historical formation and evolution of the Earth,the history of observations research of atmospheric greenhouse gas is very short.The observation and research methods and equipment need to be improved.Human beings are actively seeking various mitigation and adaptation measures to deal with them. Therefore,in-depth study of regional characteristics of greenhouse gases is very urgent and important.A design and development of the soil surface(horizontal) and profile(vertical) of carbon dioxide in situ observation methods and devices have been carried out of the temperate,arid areas in China.Two observation sites were selected with a typical grassland in chestnut soil,desert grassland in sierozem,Elm stand in fragmental soil and chinese pine stand in gray-cinnamonic soil.The concentration in surface layers and the flux of carbon dioxide between soil surface and atmosphere with 38-point of sample have been measured and researched in situ since 2005.The main results are as follows:1.An in situ method and apparatus for measuring CO2 flux at soil surfaceAn in situ method and apparatus for measuring carbon dioxide flux at soil surface have been carried out.The methods and devices can be used for the concentration observations of carbon dioxide at surface layer of atmosphere and the flux measurment of carbon dioxide between soil and atmosphere in situ,with spending of small,portable and easy to operate devices,and diverse points of reliable data,directly and rapid obtained.2.An In Situ Method and Apparatus for Measuring CO2 Flux at Various Depths of Arid Soil An in situ method and apparatus for measuring carbon dioxide flux at various depths of arid soil have been carried out.The methods and devices can be used for soil CO2 flux of observation at different depths(0-200 cm).Other values are the CO2 storage Estimation at different soil depth,the value Estimation of CO2 emissions caused by change of land-use and land-cover,as well as restoration of vegetation or soil fertility rate of evaluation.3.The characteristics of the carbon dioxide concentration in the surface layer of the atmosphereThis research focus on the concentration of carbon dioxide from the surface layer of atmosphere in 4 vegetations:typical grassland in chestnut soil,desert grassland in sierozem, Elm stand in fragmental soil and chinese pine stand in gray-cinnamonic soil.

Mots clés : global warming, greenhouse gases, measurement in situ, background concentration of atmosphere, flux

Présentation (Globethesis)

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