Journal ArticleDOI
Effect of nitrogen fertilizers and moisture content on CH4 and N2O fluxes in a humisol: measurements in the field and intact soil cores
TLDR
In this article, the effects of nitrogen fertilizers and soil water content on N2O and CH4 fluxes in a humisol located on the Central Experimental Farm of Agriculture Canada, Ottawa were investigated.Abstract:
Field and laboratory studies were conducted to determine effects of nitrogen fertilizers and soil water content on N2O and CH4 fluxes in a humisol located on the Central Experimental Farm of Agriculture Canada, Ottawa. Addition of 100 kg N ha−1 as either urea or NaNO3 had no significant effect on soil CH4 flux measured using chambers. Fertilization with NaNO3 resulted in a significant but transitory stimulation of N2O production. Inorganic soil N profiles and the potential nitrification rate suggested that much of the NH
4
+
from urea hydrolysis was rapidly nitrified. CH4 fluxes measured using capped soil cores agreed well with fluxes measured using field chambers, and with fluxes calculated from soil gas concentration gradients using Fick's diffusion law. This humisol presents an ideal, unstructured, vertically homogeneous system in which to study gas diffusion, and the influence of gas-filled porosity on CH4 uptake. In soil cores gradually saturated with H2O, the relationship of CH4 flux to gas-filled porosity was an exponential rise to a maximum. Steepening CH4 concentration gradients partially compensated for the decreasing diffusion coefficient of CH4 in soil matrix air as water content increased, and diffusion limitation of CH4 oxidation occurred only at water contents > 130% (dry weight), or gas-filled porosities < 0.2.read more
Citations
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Journal ArticleDOI
Soil microorganisms as controllers of atmospheric trace gases (H2, CO, CH4, OCS, N2O, and NO).
TL;DR: It is completely unclear how important microbial diversity is for the control of trace gas flux at the ecosystem level, and different microbial communities may be part of the reason for differences in trace gas metabolism, e.g., effects of nitrogen fertilizers on CH4 uptake by soil; decrease of CH4 production with decreasing temperature.
Journal ArticleDOI
Nitrogen as a regulatory factor of methane oxidation in soils and sediments.
TL;DR: The purpose of this minireview is to summarise and balance the data on the regulatory role of nitrogen in the consumption of methane by soils and sediments, and stimulate the scientific community to embark on experiments to close the existing gap in knowledge.
Journal ArticleDOI
Climate change: linking adaptation and mitigation through agroforestry
Louis V. Verchot,Meine van Noordwijk,Serigne T Kandji,Thomas P. Tomich,C. K. Ong,Alain Albrecht,Jens Mackensen,Cynthia Bantilan,K. V. Anupama,Cheryl A. Palm +9 more
TL;DR: In this article, the authors examine data on the mitigation potential of agroforestry in the humid and sub-humid tropics and present the scientific evidence that leads to the expectation that agro-forestry also has an important role in climate change adaptation, particularly for small holder farmers.
Journal ArticleDOI
Inventorying emissions from nature in Europe
David Simpson,Wilfried Winiwarter,Gunnar Börjesson,Steve Cinderby,Antonio Ferreiro,Alex Guenther,C. Nicholas Hewitt,Robert W. Janson,M. Aslam K. Khalil,Susan M. Owen,Tom Pierce,Hans Puxbaum,Martha J. Shearer,Ute Skiba,Rainer Steinbrecher,Leonor Tarrasón,Mats G. Öquist +16 more
TL;DR: In this paper, a new set of guidelines has been developed for assessing the emissions of sulphur, nitrogen oxides, NH3, CH4, and nonmethane volatile organic compounds (NMVOC) from biogenic and other natural sources in Europe.
Journal ArticleDOI
TURNER REVIEW No. 18. Greenhouse gas fluxes from natural ecosystems
Ram C. Dalal,D. E. Allen +1 more
TL;DR: The impact of increasing N deposition on natural ecosystems is poorly understood, and further understanding is required regarding the use of drainage as a management tool, to reduce CH4 emissions from wetlands and to increase GHG sink from the restoration of degraded lands, including saline and sodic soils.
References
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Soil physics with BASIC :transport models for soil-plant systems
TL;DR: In this paper, the authors present an analysis of the physical properties of soil, including temperature, heat flow, and water potential, as well as a discussion of the relationship between these properties and plant-water relations.
Journal ArticleDOI
Methane and nitrous oxide fluxes in native, fertilized and cultivated grasslands
TL;DR: In this article, the authors measured CH4 uptake and N2O emissions in native, nitrogen-fertilized, and wheat-growing prairie soils from spring to late autumn, 1990.
Journal ArticleDOI
Physiology, biochemistry, and specific inhibitors of CH4, NH4+, and CO oxidation by methanotrophs and nitrifiers.
TL;DR: The lack of inhibitors specific for one or the other of the two groups of bacteria hampers the determination of their relative roles in nature.
Journal ArticleDOI
Influence of nitrogen fertilization on methane uptake in temperate forest soils
TL;DR: In this paper, a study of CH4 uptake by aerobic temperate-forest soils was conducted, and the authors found that CH4 consumption rates of these soils were decreased significantly by elevated soil moisture and nitrogen additions, implying that nitrogen fertilization may reduce this CH4 sink.