Estimation des émissions gazeuses de NH3, NO et N2O par les terres agricoles à l'échelle mondiale PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Estimation des émissions gazeuses de NH3, NO et N2O par les terres agricoles à l'échelle mondiale PDF full book. Access full book title Estimation des émissions gazeuses de NH3, NO et N2O par les terres agricoles à l'échelle mondiale by Organisation des Nations Unies pour l'alimentation et l'agriculture. Download full books in PDF and EPUB format.
Author: Organisation des Nations Unies pour l'alimentation et l'agriculture
Publisher: Food & Agriculture Org.
ISBN: 9789252046899
Category : Agriculture
Languages : fr
Pages : 128
Get Book Here
Book Description
Author: Organisation des Nations Unies pour l'alimentation et l'agriculture
Publisher: Food & Agriculture Org.
ISBN: 9789252046899
Category : Agriculture
Languages : fr
Pages : 128
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : it
Pages : 112
Get Book Here
Book Description
Author:
Publisher: Food & Agriculture Organization of the UN (FAO)
ISBN:
Category : Science
Languages : en
Pages : 124
Get Book Here
Book Description
Plants take up only 50 percent of the nitrogen fertilizer applied to agricultural land. Part of this inefficiency is a result of emissions of ammonia (NH3 ), nitrous oxide (N2O) and nitric oxide (NO). Quantifying these emisions is important, both as part of an attempt to improve fertilizer use efficiency and because of their influence on ecosystems, atmospheric pollution and the so-called greenhouse effect. This report provides a comprehensive review of the literature about emissions of NH3, N2O and NO, and examines the regulating factors, measurement techniques and models. It draws these data together and generates global emission estimates that can serve as a basis for further addressing the issues of efficiency and environmental impact.
Author: Li, Xiaomei
Publisher:
ISBN: 9780778531715
Category : Ammonia
Languages : en
Pages : 31
Get Book Here
Book Description
Author: David Ussiri
Publisher: Springer
ISBN: 9789400798809
Category : Science
Languages : en
Pages : 0
Get Book Here
Book Description
Nitrous oxide gas is a long-lived relatively active greenhouse gas (GHG) with an atmospheric lifetime of approximately 120 years, and heat trapping effects about 310 times more powerful than carbon dioxide per molecule basis. It contributes about 6% of observed global warming. Nitrous oxide is not only a potent GHG, but it also plays a significant role in the depletion of stratospheric ozone. This book describes the anthropogenic sources of N2O with major emphasis on agricultural activities. It summarizes an overview of global cycling of N and the role of nitrous oxide on global warming and ozone depletion, and then focus on major source, soil borne nitrous oxide emissions. The spatial-temporal variation of soil nitrous oxide fluxes and underlying biogeochemical processes are described, as well as approaches to quantify fluxes of N2O from soils. Mitigation strategies to reduce the emissions, especially from agricultural soils, and fertilizer nitrogen sources are described in detail in the latter part of the book.
Author: Deepanjan Majumdar
Publisher: Nova Science Pub Incorporated
ISBN: 9781607411833
Category : Science
Languages : en
Pages : 134
Get Book Here
Book Description
Atmospheric presence of nitrous oxide (N2O) is known for many years but its concentration has increased alarmingly by 46 ppbv (17%) since 1750 and by 0.0008 ppb yr-1 during 1990-1999. Nitrous oxide is a 296 times more potent greenhouse gas than CO2 on a 100-year time scale and causes enhanced greenhouse effect, a phenomenon first discovered in 1976. Nitrous oxide emission from 1750 to 2000 has caused an atmospheric radiative forcing of 0.15 W m-2. Moreover, N2O is indirectly involved in catalytic destruction of stratospheric ozone. Due to its atmospheric lifetime of about 120-150 years, atmospheric N2O burden will persist for many years even if its emission is stopped now. Various estimates differ widely on the contribution of agriculture in anthropogenic N2O emissions viz. 96%, 81%, 76%, 65% etc. Although several studies on N2O emissions from rice have been done in last two decades, no clear-cut contribution of rice or any other crop, for that matter, on atmospheric N2O loading has been worked out till date. Only less than 1% of applied N is lost through N2O from rice fields and its overall amount and radiative forcing are much lower than CH4, the major greenhouse gas emitted from rice fields. Possible sources of N for N2O emission in rice fields are fertilisers, manures and green manures, irrigation water, N fixed by floodwater algae, plant debris and as long as rice cultivation exists, N2O will be emitted. It has been suggested that N2O emission from agriculture might increase by 90% during 1986 to 2026. Monitoring of N2O from rice hasn't been done as extensively as CH4, as emission of former is low due to reduction to N2 in flooded rice fields. Since, overall amount of fertiliser N usage and acreage of rice are increasing, N2O emission might increase appreciably globally and so, monitoring of N2O emission from different rice ecosystems and estimating realistic regional and global budgets form rice ecosystems assume high significance. Efforts to predict N2O emissions through simulation of soil N pathways are underway, but it is difficult since emission from rice soil is controlled by the real-time field conditions and fluctuations in cultural practices. Whatever be the emission, it creates environmental disturbance slowly but surely. Efforts should be focused on the mitigation of N2O emission without compromising crop production, degrading the environment and creating pressure on financial resources.
Author: Vincent Prieur
Publisher:
ISBN:
Category :
Languages : fr
Pages : 165
Get Book Here
Book Description
L’augmentation de la demande en surfaces agricoles et l’intensification des pratiques agricoles, conséquences d’une part, de la croissance de la population mondiale et du changement de mode de consommation qui accompagne le développement des pays émergents et, d’autre part, du développement de la filière des agro-carburants, représentent une pression croissante pour les écosystèmes et une source importante de gaz à effet de serre (GES) qu’il faut prendre en compte dans le cadre du changement climatique. L’agriculture représente 10 à 12% des émissions globales de GES et, en particulier, 60% des émissions de protoxyde d’azote (N2O) qui a un pouvoir radiatif 310 fois supérieur à celui du CO2 à horizon de 100 ans. Cette thèse fournit une estimation des émissions de N2O des sols cultivés à l’échelle de l’Europe à l’aide du modèle global de surface continentale et de dynamique de la végétation, O-CN. Ce type de modèle, développé initialement pour estimer les flux de carbone entre la biosphère et l’atmosphère, permet d’étudier les émissions de gaz azotés grâce à l’ajout récent d’une modélisation du cycle de l’azote dans la biosphère et de la dynamique de l’azote minéral du sol. Des tests de sensibilité des émissions de N2O à des paramètres internes du modèle et à des facteurs environnementaux ont été effectués. L’application du modèle sur des sites expérimentaux et la comparaison aux observations ont permis l’évaluation des émissions simulées. Les résultats obtenus sont mis en perspective par la comparaison à l’échelle de la France avec les estimations du modèle agro-environnemental CERES-EGC et à l’échelle de l’Europe avec les bases de données GEIA, EDGAR 3.2 et IER.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 16
Get Book Here
Book Description
In Canada, agriculture's share of anthropogenic nitrous oxide (N2O) emissions is estimated to be about 59%. Accurate estimates of annual N2O emissions at field, regional, and national scales are required to establish baseline values of emissions of this potent greenhouse gas, to compare current N2O management strategies & identify best management practices, and to evaluate & monitor the impact of management changes. This paper discusses the difficulties in measuring N2O emissions from agricultural sources, then describes N2O estimation methods found in the literature. It includes information on the IPCC methodology, the DNDC (DeNitrification DeComposition) model by Li et al. (1992), the CENTURY model of Parton et al. (1993), the Expert-N system of Baldioli et al. (1974), and research on validation of models for Canadian conditions. Finally, directions for further research are suggested.
Author: Luc Abbadie
Publisher: Springer Science & Business Media
ISBN: 0387338578
Category : Science
Languages : en
Pages : 422
Get Book Here
Book Description
Synthesizing 40 years of ongoing ecological research, this book examines the structure, function, and dynamics of the Lamto humid savanna. From the history of the Lamto ecology station, to an overview of enivronmental conditions of the site, and examining the integrative view of energy and nutrient fluxes relative to the dynamics of the region's vegetation, this exacting work is as unique and treasured as Lamto itself.
Author: Ahmed Belasri
Publisher: Springer Nature
ISBN: 9811554447
Category : Technology & Engineering
Languages : en
Pages : 659
Get Book Here
Book Description
This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
