Abstract
ABSTRACT Nitrous oxide (N2O) is a greenhouse gas that contributes substantially to global climate change. The N2O soil emissions have a large uncertainty because of its low atmospheric concentration levels and enormous spatial and temporal variability, which hinders its correct field measurement. For this reason, there are many papers focused on improving the N2O measurements in the field, which focus on different parts of the measurement process. However, no studies have focused on determining the appropriate method, in terms of [...]
Highlights
Nitrous oxide (N2O) is the main greenhouse gas emitted from the soil by the agricultural sector (IPCC, 2014) and participates in the depletion of stratospheric ozone (Del Grosso et al, 2008)
The gas samples were immediately transferred from the syringes to vials of 10 mL according to the procedure corresponding to each of the method described below: 1 – Gas Exchange by Displacement (GED): This method was proposed by the United States Department of Agriculture (USDA; Collier, 2014) and it consists in displacing the original gas inside the vial through a small needle inserted in the septum of the vial, by injecting over-pressurized gas with a needle syringe
Despite the fact that the N2O emission rates were linear, they differed in the emission values, ordering from highest to lowest according to 0.89, 0.84, and 0.78 for VP, GED, and VS methods respectively
Summary
Nitrous oxide (N2O) is the main greenhouse gas emitted from the soil by the agricultural sector (IPCC, 2014) and participates in the depletion of stratospheric ozone (Del Grosso et al, 2008). The emissions of N2O from the soil have a considerable uncertainty compared to other greenhouse gases because of its low atmospheric concentration levels and enormous spatial and temporal variability (Hensen et al, 2013). In this context, it is imperative to correctly assess whether soils are a source or a sink for this gas (Oertel et al, 2016) and to establish the magnitude of N2O flow under different environments. Despite this step is key, studies about the method of transferring the sampled gas from inside of the chamber to the storage vials were not found in the literature (Rochette and Eriksen-Hamel, 2008; Hensen et al, 2013; Klein and Harvey, 2015)
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