کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6354969 1622649 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Country reportModeling the effects of vegetation on methane oxidation and emissions through soil landfill final covers across different climates
ترجمه فارسی عنوان
گزارش کشور مبادله اثرات پوشش گیاهی روی اکسیداسیون متان و انتشار آن از طریق مصالح دفن زباله های خاکی در مناطق مختلف آب و هوایی
کلمات کلیدی
زندگی گیاهی، اکسیداسیون متان، انتشار گازهای گلخانهای، درصد اکسیداسیون، جلد نهایی، انتشار گازهای گلخانه ای،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
چکیده انگلیسی


- Numerical simulations suggest that vegetation can lead to an increase in methane oxidation rates in landfill soil covers.
- Simulated higher oxidation rate is caused by the simulated change in soil physical properties.
- Simulated higher oxidation rate is also caused by assumed higher Vmax associated with vegetation.
- Modeled surface emissions are significantly lower for simulated vegetated landfill soil covers.

Plant roots are reported to enhance the aeration of soil by creating secondary macropores which improve the diffusion of oxygen into soil as well as the supply of methane to bacteria. Therefore, methane oxidation can be improved considerably by the soil structuring processes of vegetation, along with the increase of organic biomass in the soil associated with plant roots. This study consisted of using a numerical model that combines flow of water and heat with gas transport and oxidation in soils, to simulate methane emission and oxidation through simulated vegetated and non-vegetated landfill covers under different climatic conditions. Different simulations were performed using different methane loading flux (5-200 g m−2 d−1) as the bottom boundary. The lowest modeled surface emissions were always obtained with vegetated soil covers for all simulated climates. The largest differences in simulated surface emissions between the vegetated and non-vegetated scenarios occur during the growing season. Higher average yearly percent oxidation was obtained in simulations with vegetated soil covers as compared to non-vegetated scenario. The modeled effects of vegetation on methane surface emissions and percent oxidation were attributed to two separate mechanisms: (1) increase in methane oxidation associated with the change of the physical properties of the upper vegetative layer and (2) increase in organic matter associated with vegetated soil layers. Finally, correlations between percent oxidation and methane loading into simulated vegetated and non-vegetated covers were proposed to allow decision makers to compare vegetated versus non-vegetated soil landfill covers. These results were obtained using a modeling study with several simplifying assumptions that do not capture the complexities of vegetated soils under field conditions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Waste Management - Volume 36, February 2015, Pages 230-240
نویسندگان
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