The importance of denitrification for N2O emissions from an N-saturated forest in SW China: results from in situ 15N labeling experiments

Zhu, Jing; Mulder, Jan; Bakken, Lars R.; Dörsch, Peter

doi:10.1007/s10533-013-9883-8

Cited by 44 publications

(42 citation statements)

References 47 publications

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“…The positive correlation is consistent with other findings by Papen andButterbach-Bahl (1999), andYuping et al (2008). N 2 O flux was positively correlated with soil moisture content (%), which is in good agreement with other studies (Lemke et al, 1998;Rafique et al, 2011;Zhu et al, 2013a). Greater N 2 O emissions during rainy season at both landuses were associated with higher soil moisture content that enhance microbial activity.…”

Section: Discussionsupporting

confidence: 91%

Higher N2O emission by intensified crop production in South Asia

Raut

Sitaula

Bakken

et al. 2015

Global Ecology and Conservation

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a b s t r a c tIntensification of food production in Nepal has been found to acidify the soils and hence increase their apparent propensity to emit N 2 O as measured by the N 2 O/(N 2 + N 2 O) product ratio of denitrification during standardized anoxic incubations (Raut et al., 2012). We hypothesized that this would lead to high N 2 O emission factors (EF), and tested this by measuring N 2 O emissions from fields on which intensified crop production (IC) had been practiced for the last 20 years, and adjacent fields having traditional crop production (TC) practices. The measurements were done every one to two weeks over a period of 12 months covering two to three cropping periods. On the sites with periodically flooded soils, the cumulated emissions for IC and TC were 15.41 and 7.23 kg N 2 O/ha, respectively. On the sites with permanently drained soils, the cumulated emissions were 5.43 and 1.46 kg N 2 O/ha (IC and TC). We used the available data on fertilizer levels to calculate an emission factor for the transition from TC to IC (EF I ); i.e. ∆N 2 O − N/∆N fertilizer , where ∆N 2 O-N is the cumulated emission in IC minus that in TC, ∆N fertilizer is the annual N input to IC minus that in TC.The EF values were 0.08 and 0.02 for the sites with permanently drained and periodically flooded soils, respectively. These factors are 2 to 8 times higher than the EF values used by IPCC to calculate emission as a function of fertilizer level. The high EF I appear to confirm our hypothesis that intensification will lead to higher emission of N 2 O than that predicted by the increase in nitrogen inputs, and that this is due to the soil acidification.

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Section: Discussionsupporting

confidence: 91%

Higher N2O emission by intensified crop production in South Asia

Raut

Sitaula

Bakken

et al. 2015

Global Ecology and Conservation

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“…The 15 N abundance of NH 4 + was not measured in this study since the high NO 3 − content in our soil and no extra organic carbon was added; the process of dissimilatory NO 3 − reduction to NH 4 + could be neglected (Zhu et al 2013). Moreover, NH 4 + concentrations in the soil extracts were too low to make a dependable determination of the 15 N enrichment.…”

Section: Calculations and Statisticsmentioning

confidence: 92%

Compaction stimulates denitrification in an urban park soil using 15N tracing technique

Deng

Rensing

et al. 2013

Environ Sci Pollut Res

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Soils in urban areas are subjected to compaction with accelerating urbanization. The effects of anthropogenic compaction on urban soil denitrification are largely unknown. We conducted a study on an urban park soil to investigate how compaction impacts denitrification. By using 15 N labeling method and acetylene inhibition technique, we performed three coherent incubation experiments to quantify denitrification in compacted soil under both aerobic and anaerobic conditions. Uncompacted soil was set as the control treatment. When monitoring soil incubation without extra substrate, higher nitrous oxide (N 2 O) flux and denitrification enzyme activity were observed in the compacted soil than in the uncompacted soil. In aerobic incubation with the addition of K 15 NO 3 , N 2 O production in the compacted soil reached 10.11 ng N h −1 g −1 as compared to 0.02 ng N h −1 g −1 in the uncompacted soil. Denitrification contributed 96 % of the emitted N 2 O in the compacted soil and 36 % of the emitted N 2 O in the uncompacted soil; total denitrification rate was higher in the compacted soil (up to 79.35 ng N h −1 g −1 ) than in the uncompacted soil (0.11 ng N h −1 g −1 ). Under anaerobic incubation with the addition of K 15 NO 3 , no statistical difference in total N losses and 15 N-(N 2 O+N 2 ) flux between the uncompacted soil and the compacted soil was detected. Compaction promoted soil denitrification and may impact urban N biogeochemical cycling.

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“…One of our previous results demonstrated that a high level of NH 4 Cl addition significantly led to soil NO 3 À accumulation, which indirectly indicates a high O 2 consumption caused by a high nitrification rate [23]. Using 15 N-tracing experiment and 15 N-tracing models, denitrification was believed to be the largest source of N 2 O flux relative to nitrification and other N transformations in the subtropical forest soils [58,59]. On the other hand, accelerated nitrification by NH 4 þ additions gradually decreased soil pH, which would result in higher N 2 O/N 2 ratio during soil denitrification [60].…”

Section: Linkages Between Soil Ch 4 and N 2 O Fluxes And Ammoniaoxidimentioning

confidence: 93%

Relationships between ammonia-oxidizing communities, soil methane uptake and nitrous oxide fluxes in a subtropical plantation soil with nitrogen enrichment

Wang

Cheng

Fang

et al. 2016

European Journal of Soil Biology

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a b s t r a c tAmmonia-oxidizers play an essential role in nitrogen (N) transformation and nitrous oxide (N 2 O) emission in forest soils. It remains unclear if ammonia-oxidizers affect interaction between methane (CH 4 ) uptake and N 2 O emission. Our specific goal was to test the impacts of changes in ammoniaoxidizing communities elicited by N enrichment on soil CH 4 uptake and N 2 O emission. Based on a field experiment, two-forms (NH 4 Cl and NaNO 3 ) and two levels (40 and 120 kg N ha À1 yr À1 ) of N were applied in the subtropical plantation forest of southern China. Soil CH 4 and N 2 O fluxes, the abundance and structure of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) communities were measured using static chamber-gas chromatography, quantitative PCR (qPCR), and terminalrestriction fragment length polymorphism (T-RFLP). Nitrogen addition tended to inhibit soil CH 4 uptake, but significantly promoted soil N 2 O emission; moreover, these impacts were more significant with NH 4 þ À N than with NO 3 À À N addition. NH 4 Cl addition significantly changed ammonia-oxidizer abundance with an increase in AOA and a decrease in AOB. Nitrogen additions significantly decreased the relative abundance of 329 bp and 421 bp of archaeal amoA gene. Negative relationships occurred between soil CH 4 uptake and AOA abundance and between soil CH 4 uptake and AOA/AOB ratio; however, a positive relationship was found between soil N 2 O emission and AOA abundance. These results indicate that a shift in abundance and composition of ammonia-oxidizing communities is closely linked to changes in soil CH 4 uptake and N 2 O emission under N enrichment. Furthermore, AOA communities play a contrasting role from AOB communities for regulating the fluctuation between soil CH 4 and N 2 O fluxes.

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The importance of denitrification for N2O emissions from an N-saturated forest in SW China: results from in situ 15N labeling experiments

Cited by 44 publications

References 47 publications

Higher N2O emission by intensified crop production in South Asia

Higher N2O emission by intensified crop production in South Asia

Compaction stimulates denitrification in an urban park soil using 15N tracing technique

Relationships between ammonia-oxidizing communities, soil methane uptake and nitrous oxide fluxes in a subtropical plantation soil with nitrogen enrichment

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