Which of the following is a greenhouse gas? A. Oxygen B. Nitrogen C. Carbon dioxide D. Helium 相关知识点: 试题来源: 解析 C。“Carbon dioxide”二氧化碳是一种温室气体。“Oxygen”氧气、“Nitrogen”氮气、“Helium”氦气都不是温室气体。
Carbon dioxide and methane C. Hydrogen and helium D. Argon and neon 相关知识点: 试题来源: 解析 B。“Greenhouse gas”主要由“二氧化碳和甲烷”组成。A 选项的氧气和氮气是大气的主要成分,但不是温室气体;C 选项的氢和氦不是主要的温室气体;D 选项的氩和氖也不是。故选 B。 反馈 收藏 ...
High purity nitrogen gas can be obtained using an "in-house" system with a hollow fiber membrane which separates the nitrogen from oxygen and water vapor in compressed air. A small compressor is used which requires...
Food systems contribute one-third of global anthropogenic greenhouse gas (GHG) emissions, roughly 16.5 GtCO2e year−1from a total 54 GtCO2e year−11,2, with both pre- and post-production phases representing a high and increasing share of total emissions3. The Food and Agriculture Organizati...
[1] Anthropogenic nitrogen (N) inputs have been found to influence emissions of greenhouse gases from a variety of ecosystems; however, the effects of N loading on greenhouse gas dynamics in lakes are not well documented. We measured concentrations of carbon dioxide (CO2), methane (CH4), and...
Emissions of the greenhouse gases carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4) from a sugarcane crop have been measured for the whole of the 2005-06 growing season of 342 days. The investigation employed chambers and micrometeorological techniques. The ratoon crop, grown on an...
This study estimated the potential emissions of greenhouse gases (GHG) from bioenergy ecosystems with a biogeochemical model AgTEM, assuming maize ( Zea mays L.), switchgrass ( Panicum virgatum L.), and Miscanthus ( Miscanthus×giganteus ) will be grown on the current maize-producing areas in ...
The fourth session of the United Nations Environment Assembly (UNEA-4) held in March 2019 passed a resolution to promote sustainable nitrogen management and tackle pollution and greenhouse gas emissions, according to Carvalho. However, she said, multilateral action to reduce nitrogen waste has gained...
Greenhouse gas fluxes were measured over 8 weeks. Within the UAN and swine manure treatments both N2O and CH4 emissions were greater in the sandy loam than in the clay soil. In the sandy loam soil N2O emissions were significantly different among all N treatments, but in the clay soil only ...
Greenhouse gas emissions from the wheat-maize cropping system under different tillage and crop residue management practices in the North China Plain Huang B-X, Jiang R-F, Zhang F-S (2013) Greenhouse gas emissions from a wheat-maize double cropping system with different nitrogen fertilization ...