Gas Emissions from Soil

Dear Colleagues,

Greenhouse gas (GHG) emissions from the agricultural sector, particularly carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O), are increasing globally as a result of anthropogenic activities, and they are mainly responsible for changing Earth’s climate by absorbing and re-emitting energy from the lower atmosphere. The production of such gases in response to interactions between chemical and physical processes in soils represents a natural biological activity. CO₂, CH₄, and N₂O emissions are produced in soil aerobic conditions, soil anaerobic conditions, and nitrification and denitrification processes of mineral N, respectively. Human intervention, especially through changing land use, and the steady increase in gas throughout the twentieth century have caused an increase in emissions of all three trace gases. Although these gases are usually emitted from soils, they can also be absorbed by soils in certain circumstances. Such gaseous exchanges have a clear geographical element that must be integrated with an understanding of pedology and of the environmental background, in order to provide a full comprehension of the complex problems involved. Understanding the relevant soil processes will enable the introduction of measures to limit emissions and lessen their effect. Agricultural and forestry activities are potential sources of GHG emissions to the atmosphere produced as a result of soil biological processes. More knowledge on the biological processes that promote GHG emissions from soil, as well as on their relation with different types of soil management and use, will allow the creation of new opportunities for agricultural development under environmentally friendly conditions. I would like to invite everyone studying greenhouse gas emissions in agroecosystems to contribute their papers to this Special Issue.

Dr. Caiqing Qin
Guest Editor

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• soil conditions
• gas emissions from soils
• processes of edaphon
• land use change
• global climate change
• greenhouse gases