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Academic Journal of Environmental Biology, 2022, 3(1); doi: 10.38007/AJEB.2022.030101.

Effects of Atmospheric Nitrogen Deposition on Nitrous Oxide Emission from Mountainous Forest Soils in Southwest Karst Region

Author(s)

Constabler Edwin

Corresponding Author:
Constabler Edwin
Affiliation(s)

University of London, UK

Abstract

Forests are the most important component of terrestrial ecosystems, and they are also direct bearers of large areas of nitrogen deposition. Atmospheric nitrogen deposition has many hazards to forest ecosystems, and the emission of soil nitrous oxide is an important reference indicator. However, current research on atmospheric nitrogen deposition has focused on carbon emissions. The purpose of this article is to study the effect of atmospheric nitrogen deposition on the emission of nitrous oxide from soils of mountain forests in the karst areas of Southwest China. To this end, this paper studied the vegetation types and soil types of mountain forests in the karst areas of Southwest China and the production of nitrous oxide by means of literature research and experimental methods. Mechanism. The main mechanisms of nitrous oxide production are: nitrification, denitrification, nitrifying bacteria denitrification, fungal denitrification, and abiotic processes. The factors affecting soil nitrous oxide emissions were studied. The urea was used to simulate atmospheric nitrogen deposition. The soil nitrous oxide flux was measured through experiments. The nitrogen dioxide emissions in various areas before and after simulated nitrogen deposition were compared. The research results show that the growth rate of nitrous oxide emission is highest in the areas where the Pinus massoniana forest is planted, reaching 36.8% in yellow soil and 25.1% in lime soil. The growth rate of nitrous oxide emission of yellow soil in karst area after atmospheric nitrogen deposition is significantly higher than that of lime soil. It may be because alkaline urea is more easily absorbed in acidic yellow soil, but more difficult to absorb in the same alkaline lime soil. In addition, there may be effects of moisture and microorganisms.

Keywords

Atmospheric Nitrogen Deposition, Karst Landform, Mountain Forest, Nitrous Oxide

Cite This Paper

Constabler Edwin. Effects of Atmospheric Nitrogen Deposition on Nitrous Oxide Emission from Mountainous Forest Soils in Southwest Karst Region. Academic Journal of Environmental Biology (2022), Vol. 3, Issue 1: 1-15. https://doi.org/10.38007/AJEB.2022.030101.

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