Diurnal, seasonal, and inter-annual variations of N2O fluxes from native semi-arid grassland soils of inner Mongolia

Du, Rui; Lü, Daren; Wang, Gengchen

doi:10.1016/j.soilbio.2006.06.012

Cited by 101 publications

(75 citation statements)

References 19 publications

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“…This is in contrast to other studies (e.g. Du et al, 2006) and even to measurements taken on the same field in 2002, where clear diurnal cycles were measured with the same EC setup (Di Marco et al, 2004). This might be due to the lack of a pronounced soil temperature variation specific to the presented comparison periods.…”

Section: Spatial and Temporal Variabilitycontrasting

confidence: 89%

“…Diurnal patterns of N 2 O fluxes after fertiliser applications usually have shown peak fluxes around midday in several studies (e.g. Di Marco et al, 2004;Flechard et al, 2005;Du et al, 2006). In order to examine if the magnitude of cumulative fluxes is biased due to one single sampling at midday, we compared cumulative fluxes calculated from EC daily means (EC b ) with cumulative fluxes calculated from EC comparison points (EC a ), which were taken simultaneously as chamber measurements, usually between 10:00 and 12:00 am.…”

Section: Cumulative Fluxesmentioning

confidence: 99%

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Nitrous oxide emissions from managed grassland: a comparison of eddy covariance and static chamber measurements

et al. 2011

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Abstract.Managed grasslands are known to be an important source of N 2 O with estimated global losses of 2.5 Tg N 2 O-N yr −1 . Chambers are to date the most widely used method to measure N 2 O fluxes, but also micrometeorological methods are successfully applied. In this paper we present a comparison of N 2 O fluxes measured by non-steady state chambers and eddy covariance (EC) (using an ultra-sonic anemometer coupled with a tunable diode laser) from an intensively grazed and fertilised grassland site in South East Scotland. The measurements were taken after fertilisation events in 2003, 2007 and 2008. In four out of six comparison periods, a short-lived increase of N 2 O emissions was observed after mineral N application, returning to background level within 2-6 days. Highest fluxes were measured by both methods in July 2007 with maximum values of 1438 ng N 2 O-N m −2 s −1 (EC) and 651 ng N 2 O-N m −2 s −1 (chamber method). Negative fluxes above the detection limit were observed in all comparison periods by EC, while with chambers, the recorded negative fluxes were always below detection limit. Median and average fluxes over each period were always positive. Over all 6 comparison periods, 69 % of N 2 O fluxes measured by EC at the time of chamber closure were within the range of the chamber measurements. N 2 O fluxes measured by EC during the time of chamber closure were not consistently smaller, neither larger, compared to those measured by chambers: this reflects the fact that the different techniques integrate fluxes over different spatial and temporal scales. Large fluxes measured by chambers may be representing local hotspots providing a small contribution to the flux measured by the EC method which integrates over a larger area. The spatial variability from Correspondence to: S. K. Jones (stephanie.jones@sac.ac.uk) chamber measurements was high, as shown by a coefficient of variation of up to 139 %. No diurnal pattern of N 2 O fluxes was observed, possibly due to the small diurnal variations of soil temperature. The calculation of cumulative fluxes using different integration methods showed EC data provide generally lower estimates of N 2 O emissions than chambers.

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Section: Spatial and Temporal Variabilitycontrasting

confidence: 89%

Section: Cumulative Fluxesmentioning

confidence: 99%

Nitrous oxide emissions from managed grassland: a comparison of eddy covariance and static chamber measurements

et al. 2011

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“…(Zhang and Han, 2008;Peng et al, 2011). In late June 2010, when the peaks of N 2 O effluxes were observed, the WFPS was nearly the lowest during the whole growing season; the highest N 2 O effluxes under drought soil water condition (WFPS < 30%) were also observed in previous studies both in fertilized (Zhang and Han, 2008;Peng et al, 2011) and native grasslands (Du et al, 2006;Yao et al, 2010) in Inner Mongolia. The processes of N 2 O production were generally considered depressed in such droughtaffected soil conditions, whereas Kim et al (2010) and Cantarel et al (2011) found that greater N 2 O emissions occurred under drought conditions in the European temperate grasslands.…”

Section: Main Influence Factors On N 2 Effluxes Under Water and N Addsupporting

confidence: 71%

“…The N 2 O emission in the temperate grassland in China is sensitive to the changes in rainfall and N deposition because of the arid or semi-arid climate and the N nutrient deficiency in this region. Numerous field studies have discussed the influence of soil moisture on N 2 O efflux in Chinese temperate grassland (e.g., Dong et al, 2000;Chen et al, 2000;Du et al, 2006;Liu et al, 2010), and some studies have explored the relationship between N addition and N 2 O efflux in this area (Zhang and Han, 2008;Peng et al, 2011). However, their conclusions regarding the effects of N addition on N 2 O efflux varied because of the comprehensive effects of other climatic and environmental conditions, especially rainfall (Xu et al, 2008;Barton et al, 2008;Smith et al, 2012;Cantarel et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Response of N 2 O emission to water and nitrogen addition in temperate typical steppe soil in Inner Mongolia, China

Liu¹,

Dong²,

Qi³

et al. 2015

Soil and Tillage Research

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A B S T R A C TThe Chinese steppe is undergoing a drastic increase in nitrogen (N) deposition, and the precipitation in this region is predicted to increase. However, the response of soil N 2 O emissions to the coupling changes of precipitation and N deposition in grassland ecosystem has been seldom discussed. A manipulative field experiment was conducted to investigate the individual and interactive effects of precipitation increase and N deposition on soil

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“…All the above-mentioned studies investigated the diurnal variation of N2O emissions from soils with uniform moisture distribution (Du et al, 2006;Scheer et al, 2008), and few studies have examined the diurnal patterns of N2O emissions from soils with non-uniform moisture distribution.…”

Section: Introductionmentioning

confidence: 99%

Diurnal pattern of nitrous oxide emissions from soils under different vertical moisture distribution conditions

Sung-Bum

et al. 2016

Chilean J. Agric. Res.

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Diurnal, seasonal, and inter-annual variations of N2O fluxes from native semi-arid grassland soils of inner Mongolia

Cited by 101 publications

References 19 publications

Nitrous oxide emissions from managed grassland: a comparison of eddy covariance and static chamber measurements

Nitrous oxide emissions from managed grassland: a comparison of eddy covariance and static chamber measurements

Response of N 2 O emission to water and nitrogen addition in temperate typical steppe soil in Inner Mongolia, China

Diurnal pattern of nitrous oxide emissions from soils under different vertical moisture distribution conditions

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