نتایج جستجو برای: dissolved ch4
تعداد نتایج: 38430 فیلتر نتایج به سال:
A combination of ground water modeling, chemical and dissolved gas analyses, and chlorofluorocarbon age dating of water was used to determine the relation between changes in agricultural practices, and NO3- concentrations in ground water of a glacial outwash aquifer in west-central Minnesota. The results revealed a redox zonation throughout the saturated zone with oxygen reduction occurring nea...
The goal of this review was to analyze published data related to mitigation of enteric methane (CH4) emissions from ruminant animals to document the most effective and sustainable strategies. Increasing forage digestibility and digestible forage intake was one of the major recommended CH4 mitigation practices. Although responses vary, CH4 emissions can be reduced when corn silage replaces grass...
Recent anthropogenic emissions of key atmospheric trace gases (e.g. CO2 and CH4) which absorb infra-red radiation may lead to an increase in mean surface temperatures and potential changes in climate. Although sources of each gas have been evaluated independently, little attention has focused on potential interactions between gases which could influence emission rates. In the current experiment...
Degraded and drained peat swamp forests (PSFs) are major sources of carbon emissions in the forestry sector. Rewetting interventions aim to reduce loss enhance stock. However, studies rewetting tropical PSFs still limited. This study examined effect on dynamics at a rewetted site an undrained site. We measured aboveground (AGC), belowground (BGC), litterfall, heterotrophic components soil respi...
افزایش غلظت و انتشار گازهای گلخانه ای در اتمسفر به فعالیت های انسانی نسبت داده شده است. از جمله این فعالیت ها انتخاب نامناسب روش های خاک ورزی، کاشت و آبیاری است. با توجه به بحران آب در چند سال اخیر، مدیریت خاک ورزی و آبیاری باید به سمت کاهش بهم خوردن خاک و کاهش نفوذ عمقی آب در سیستم های تولید محصولات کشاورزی باشد. جهت بررسی تاثیر خاک ورزی و روش های آبیاری بر میزان تصاعد گازهای گلخانه ای در کشت ...
Environmental concerns regarding the potential for drinking water contamination in shallow aquifers have accompanied unconventional energy development in the northern Appalachian Basin. These activities have also raised several critical questions about the hydrogeological parameters that control the naturally occurring presence and migration of hydrocarbon gases in shallow aquifers within petro...
Dissolved Gas Analysis (DGA) is one of the most common techniques to detect the incipient faults in the oil-filled power transformers. In this paper, a new approach of DGA technique is proposed to overcome the conflict that takes place in the traditional interpretation techniques for transformer fault diagnosis. The new approach is based on the analysis of 386 dissolved gas samples data set tha...
Despite decades of research, how life began on Earth remains one of the most challenging scientific conundrums facing modern science. It is agreed that the first step was synthesis of organic compounds essential to obtain amino acids and their polymers. Several possible scenarios that could accomplish this step, using simple inorganic molecules, have been suggested and studied over the years. T...
[1] Airborne measurements of methane (CH4) and carbon dioxide (CO2) were taken over the rice growing region of California’s Sacramento Valley in the late spring of 2010 and 2011. From these and ancillary measurements, we show that CH4 mixing ratios were higher in the planetary boundary layer above the Sacramento Valley during the rice growing season than they were before it, which we attribute ...
Methane (CH4) emissions from ruminants should be accounted for the natural grazed rangeland ecosystems when devising greenhouse gas budget inventory, in particular, their contribution to global warming. In this study, CH4 emission from sheep respiration at different grazing intensities (light grazing, 0.75 sheep/ha, LG; moderate grazing, 1.50 sheep/ha, MG; and heavy grazing, 2.25 sheep/ha, HG) ...
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