Lime-nitrogen application affects nitrification, denitrification, and N2O emission in an acidic tea soil

Yamamoto, Akinori; Akiyama, Hiroko; Naokawa, Takuji; Miyazaki, Yasuhiro; Honda, Yoshio; Sano, Yukimasa; Nakajima, Yasuhiro; Yagi, Kazuyuki

doi:10.1007/s00374-013-0830-6

Cited by 43 publications

(27 citation statements)

References 33 publications

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“…Currently, the existing studies on tea fields are only focused on N 2 O fluxes (Jumadi et al, 2005;Akiyama et al, 2006;Gogoi and Baruah, 2011;Fu et al, 2012;Han et al, 2013a;Yamamoto et al, 2014), and therefore they are not directly comparable to our present study. Our results demonstrated annual characteristics of N 2 O and NO fluxes simultaneously, which is important for a better understanding of how climatic and environmental factors affect soil nitrogen turnover processes in tea plantations.…”

Section: Intra-and Inter-annual Variations Of N 2 O and No Fluxes Andcontrasting

confidence: 59%

“…Similarly, our mean background NO emission from tea plantations is greater, relative to cereal grain croplands (0.2-0.9 kg N ha −1 yr −1 , Yao et al, 2013;Yan et al, 2015) and vegetable fields (0.2-0.8 kg N ha −1 yr −1 , Yao et al, 2015) in China. These comparisons highlight the characteristic of high background N 2 O and NO emissions from tea plantations, which is probably due to long-term heavy nitrogen fertilization and subsequent soil acidification (Tokuda and Hayatsu, 2004;Yamamoto et al, 2014). Soil acidity appears to be an important factor in affecting biotic and abiotic processes and consequently promoting nitrogen losses, such as enhancing N 2 O production ratios from nitrification and depressing the conversion of N 2 O to N 2 in denitrification (Zhu et al, 2011) as well as inducing chemodenitrification for NO production (Venterea et al, 2003;Medinets et al, 2015).…”

Section: Background N 2 O and No Emissions And Direct Emission Factormentioning

confidence: 87%

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Organically fertilized tea plantation stimulates N<sub>2</sub>O emissions and lowers NO fluxes in subtropical China

et al. 2015

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Abstract. Tea plantations are rapidly expanding in China and other countries in the tropical and subtropical zones, but so far there are very few studies including direct measurements of nitrogenous gas fluxes from tea plantations. On the basis of 2-year field measurements from 2012 to 2014, we provided an insight into the assessment of annual nitrous oxide (N 2 O) and nitric oxide (NO) fluxes from Chinese subtropical tea plantations under three practices of conventional urea application, alternative oilcake incorporation and no nitrogen fertilization. Clearly, the N 2 O and NO fluxes exhibited large intra-and inter-annual variations, and furthermore, their temporal variability could be well described by a combination of soil environmental factors including soil mineral N, water-filled pore space and temperature, based on a revised "hole-in-the-pipe" model. Averaged over a 2-year study, annual background N 2 O and NO emissions were approximately 4.0 and 1.6 kg N ha −1 yr −1 , respectively. Compared to no nitrogen fertilization, both urea and oilcake application significantly stimulated annual N 2 O and NO emissions, amounting to 14.4-32.7 kg N 2 O-N ha −1 yr −1 and at least 12.3-19.4 kg NO-N ha −1 yr −1 , respectively. In comparison with conventional urea treatment, on average, the application of organic fertilizer significantly increased N 2 O emission by 71 % but decreased NO emission by 22 %. Although the magnitude of N 2 O and NO fluxes was substantially influenced by the source of N, the annual direct emission factors of N fertilizer were estimated to be 2.8-5.9, 2.7-4.0 and 6.8-9.1 % for N 2 O, NO and N 2 O+NO, respectively, which are significantly higher than those defaults for global upland croplands. This indicated that the rarely determined N 2 O and NO formation appeared to be a significant pathway in the nitrogen cycle of tea plantations, which are a potential source of national nitrogenous gases inventory.

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Section: Intra-and Inter-annual Variations Of N 2 O and No Fluxes Andcontrasting

confidence: 59%

Section: Background N 2 O and No Emissions And Direct Emission Factormentioning

confidence: 87%

Organically fertilized tea plantation stimulates N<sub>2</sub>O emissions and lowers NO fluxes in subtropical China

et al. 2015

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“…Application of lime nitrogen significantly reduced N 2 O emissions from soil in tea fields ( Table 2). The average reduction in N 2 O emissions from tea field soil was approximately 51% over 2 years, consistent with the results reported by Tokuda (2005) and Yamamoto et al (2014). This reduction rate was greater than those reported for arable land soils (Yamamoto et al 2012).…”

Section: Discussionsupporting

confidence: 92%

“…Application of lime nitrogen affects soil microorganisms (Haenseler and Moyer 1937;Klasse 1996). As reported by Yamamoto et al (2014), cyanamide may contribute to the decrease in N 2 O emissions from tea field soil.…”

Section: Discussionmentioning

confidence: 92%

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Effects of application of lime nitrogen and dicyandiamide on nitrous oxide emissions from green tea fields

Hirono

Nonaka

2014

Soil Science and Plant Nutrition

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The aim of this study was to assess the mitigating effects of lime nitrogen (calcium cyanamide) and dicyandiamide (DCD) application on nitrous oxide (N 2 O) emissions from fields of green tea [Camellia sinensis (L.) Kuntze]. The study was conducted in experimental tea fields in which the fertilizer application rate was 544 kg nitrogen (N) ha −1 yr −1 for 2 years. The mean cumulative N 2 O flux from the soil between the canopies of tea plants for 2 years was 7.1 ± 0.9 kg N ha −1 yr −1 in control plots. The cumulative N 2 O flux in the plots supplemented with lime nitrogen was 3.5 ± 0.1 kgN ha −1 , approximately 51% lower than that in control plots. This reduction was due to the inhibition of nitrification by DCD, which was produced from the lime nitrogen. In addition, the increase in soil pH by lime in the lime nitrogen may also be another reason for the decreased N 2 O emissions from soil in LN plots. Meanwhile, the cumulative N 2 O flux in DCD plots was not significantly different from that in control plots. The seasonal variability in N 2 O emissions in DCD plots differed from that in control plots and application of DCD sometimes increased N 2 O emissions from tea field soil. The nitrification inhibition effect of lime nitrogen and DCD helped to delay nitrification of ammonium-nitrogen (NH 4 + -N), leading to high NH 4 + -N concentrations and a high ratio of NH 4 + -N /nitrate-nitrogen (NO 3 --N) in the soil. The inhibitors delayed the formation of NO 3 --N in soil. N uptake by tea plants was almost the same among all three treatments.

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Is green tea still ‘green’?

Zheng

et al. 2016

Geography and Environment

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The contemporary tea industry in China is associated with high tea production and high nitrous oxide (N 2 O) emissions, due to the application of large quantities of nitrogen (N) fertilisers, and the intrinsic characteristics of tea field soils. In total, the Chinese tea plantations may have emitted 40.9 Gg N year -1 of N 2 O for 2013, accounting for 85% of emissions from global tea plantations. Such emissions are significant, unneglectable and need to be incorporated into the national greenhouse gas inventory. The current average N 2 O emission rate and emission intensity of tea plantations in China are as high as 16.6 kg N 2 O-N ha -1 year -1 and 21.3 g N 2 O-N per kg tea production (several times greater than in other croplands), respectively, severely damaging the 'green' signature of Chinese green teas. To reduce the risk of a sudden collapse of the currently booming tea industry, due to the dramatic decline of economic profit in the event of an agricultural carbon tax scheme being implemented in the near future, investigations of the mechanisms for the high rate of N 2 O emissions and the effective N 2 O mitigation practices in tea plantations are urgently needed. Of the counties with large tea plantations, only China, India and Japan have contributed data. The measurement and research of N 2 O emissions from other large tea plantations in Africa, South and Central Asia should be alerted by this report to close the global gap of N 2 O emissions from tea plantations.

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Lime-nitrogen application affects nitrification, denitrification, and N2O emission in an acidic tea soil

Cited by 43 publications

References 33 publications

Organically fertilized tea plantation stimulates N<sub>2</sub>O emissions and lowers NO fluxes in subtropical China

Organically fertilized tea plantation stimulates N<sub>2</sub>O emissions and lowers NO fluxes in subtropical China

Effects of application of lime nitrogen and dicyandiamide on nitrous oxide emissions from green tea fields

Is green tea still ‘green’?

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Lime-nitrogen application affects nitrification, denitrification, and N2O emission in an acidic tea soil

Cited by 43 publications

References 33 publications

Organically fertilized tea plantation stimulates N&lt;sub&gt;2&lt;/sub&gt;O emissions and lowers NO fluxes in subtropical China

Organically fertilized tea plantation stimulates N&lt;sub&gt;2&lt;/sub&gt;O emissions and lowers NO fluxes in subtropical China

Effects of application of lime nitrogen and dicyandiamide on nitrous oxide emissions from green tea fields

Is green tea still ‘green’?

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Organically fertilized tea plantation stimulates N<sub>2</sub>O emissions and lowers NO fluxes in subtropical China

Organically fertilized tea plantation stimulates N<sub>2</sub>O emissions and lowers NO fluxes in subtropical China