Nitrogen deposition increases N2O emission from an N-saturated subtropical forest in southwest China

Xie, Di; Si, Gangyan; Zhang, Ting; Mulder, Jan; Duan, Lei

doi:10.1016/j.envpol.2018.09.113

Cited by 36 publications

(16 citation statements)

References 57 publications

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“…N 2 O emission is an important pathway of the soil nitrification-denitrification process [37,38]. N addition significantly increased N 2 O emission in our study, which was consistent with the results from previous studies [16,39,40]. N addition can provide a sufficient N source for nitrification-denitrification and promote the production of N 2 O [41,42].…”

Section: Effects Of the Quantity And Frequency Of N Addition On Greensupporting

confidence: 92%

Effects of N Addition Frequency and Quantity on Hydrocotyle vulgaris Growth and Greenhouse Gas Emissions from Wetland Microcosms

Zhang

Gao

et al. 2019

Sustainability

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(1) Background: Increased attention has been paid to atmospheric nitrogen (N) deposition caused by human activities. N deposition quantity has seriously affected plant productivity and greenhouse gas emissions in wetlands, but the effects of N deposition frequency remain unclear. (2) Methods: We assembled microcosms, which contained vegetative individuals (ramets) of Hydrocotyle vulgaris and soil and subjected them to three frequencies (N addition 1, 2, and 14 times during the experimental period) crossed with three quantities (5, 15, and 30 g N m−2 yr−1) for 90 days. (3) Results: The quantity of N addition significantly increased the root, stem biomass, and ramets number of H. vulgaris, but decreased the spike biomass. N addition quantity significantly promoted N2O emission and inhibited CH4 emission but had no significant effect on CO2 emission. The increasing frequency of N addition significantly promoted the root-to-shoot ratio and decreased N2O emission under high N addition quantity. (4) Conclusions: In conclusion, N addition alters the reproductive strategy of H. vulgaris and enhances its invasiveness, promoting N2O emission but not the CO2 equivalent of the H. vulgaris-soil system.

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Section: Effects Of the Quantity And Frequency Of N Addition On Greensupporting

confidence: 92%

Effects of N Addition Frequency and Quantity on Hydrocotyle vulgaris Growth and Greenhouse Gas Emissions from Wetland Microcosms

Zhang

Gao

et al. 2019

Sustainability

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“…Specifically, an increase in the N deposition rate from 10 to 30 kg ha −1 year −1 resulted in a rise in the gene abundances and N 2 O emission rate due to elevated soil N content. This is consistent with tropical and temperate ecosystems (Xie et al 2018;Zhang et al 2018). However, further increases in the N deposition rate (from 30 to 50 kg ha −1 year −1 ) led to a decline in the index values, differing from results in the literature (Frey et al 2004;Tian et al 2014;Zeng et al 2016).…”

supporting

confidence: 89%

Sensitivity of soil nitrifying and denitrifying microorganisms to nitrogen deposition on the Qinghai–Tibetan plateau

Liu

et al. 2021

Ann Microbiol

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Purpose Nitrogen deposition at rate not more than 50 kg ha−1 year−1 is generally considered to stimulate soil nitrifying and denitrifying microorganisms via increases in soil nitrogen content. However, this phenomenon in alpine ecosystems remains largely untested. Methods We conducted an 8-year nitrogen deposition experiment on the Qinghai–Tibetan Plateau, with four nitrogen deposition rates of 10 (atmospheric deposition), 20, 30, and 50 kg ha−1 year−1. Results The abundances of two nitrifying genes and four denitrifying genes and the N2O emission rate initially increased and subsequently decreased as the nitrogen deposition rate increased. The observed decrease in these indices at the rate of 50 kg ha−1 year−1 was caused by the toxicity of excessive NH4+. Conclusions Our study demonstrates the vulnerability of alpine microorganisms under global changes.

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“…For example, two-thirds of forest plots measured across Europe in one study exceeded critical loads for N inputs (Lorenz and Granke 2009); likewise, in an unrelated investigation, rates of N deposition across the US were associated with declining plant species richness in both forested and non-forested ecosystems (Simkin et al 2016). Elevated N deposition has also been associated with increased soil acidification in both rural (van Breemen et al 1984;Lu et al 2014) and urban (Huang et al 2015) areas, eutrophication of waterways , and elevated emissions of climate-forcing greenhouse gases (Xie et al 2018), which also impair air quality (Mushinski et al 2019). In regions with high rates of N deposition, such as Eastern Asia (for details on regions described in this paper, see the Methods section; Vet et al 2014), an additional pulse of N from urban areas may exacerbate ecosystem damage.…”

mentioning

confidence: 84%

“…), and elevated emissions of climate‐forcing greenhouse gases (Xie et al . ), which also impair air quality (Mushinski et al . ).…”

mentioning

confidence: 99%

Hotspots of nitrogen deposition in the world's urban areas: a global data synthesis

Decina

Hutyra

Templer

2019

Frontiers in Ecol & Environ

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Human activities have altered the global nitrogen (N) cycle, elevating rates of atmospheric N deposition up to tenfold above pre‐industrial levels, with consequences for ecosystem function and human health. To date, most N deposition studies have been carried out in rural areas; however, there has been a recent surge of N deposition studies conducted in urban ecosystems due to the increased recognition that humans are greatly altering the N cycle in these environments. We synthesized data from 174 publications over a period of 40 years that examined rates of N deposition in urban and nearby rural areas worldwide. Results of this meta‐analysis help to quantify urban N deposition, demonstrate that total N deposition in cities is predominately composed of chemically reduced – as opposed to oxidized – forms of N like ammonia, and identify regional hotspots of urban N deposition, particularly in China. These findings highlight the need to examine and address the N cycle in cities as the world continues to urbanize.

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Nitrogen deposition increases N2O emission from an N-saturated subtropical forest in southwest China

Cited by 36 publications

References 57 publications

Effects of N Addition Frequency and Quantity on Hydrocotyle vulgaris Growth and Greenhouse Gas Emissions from Wetland Microcosms

Effects of N Addition Frequency and Quantity on Hydrocotyle vulgaris Growth and Greenhouse Gas Emissions from Wetland Microcosms

Sensitivity of soil nitrifying and denitrifying microorganisms to nitrogen deposition on the Qinghai–Tibetan plateau

Hotspots of nitrogen deposition in the world's urban areas: a global data synthesis

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