Effects of long-term increased N deposition on tropical montane forest soil N2 and N2O emissions

Tang, Wenguang; Chen, Dexiang; Phillips, Oliver L.; Liu, Xian; Zhou, Zhengchao; Li, Yide; Xi, Dangpeng; Zhu, Feifei; Fang, Jingyun; Zhang, Limei; Mu, Lin; Wu, Jianhui; Fang, Yunting

doi:10.1016/j.soilbio.2018.08.027

Cited by 47 publications

(33 citation statements)

References 60 publications

(89 reference statements)

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“…We investigated N 2 production rates and processes across ∼2,500 km continental shelf sediment transect along coastline in eastern China (Figure 1) and found that denitrification process dominated N 2 production with the average relative contribution of 90% and ranged from 0.03 to 9.73 nmol N 2 g −1 h −1 (Figure 1 and Figure S3 in Supporting Information S1). Our measured N 2 production rates by denitrification were comparable to previous studies in marine and estuarine sediments (Gao et al., 2016; Lin et al., 2017) and in terrestrial ecosystems (Gu et al., 2017; Tang et al., 2018; Wu et al., 2018; Xi et al., 2016). Additionally, sediment denitrification rates in the studied regions are higher than the rates from sea water columns in some coastal regions (Dalsgaard et al., 2013; Seitzinger, 1988), confirming the estimate from models that sedimentary denitrification rate may be higher than suboxic zones (DeVries et al., 2013).…”

Section: Discussionsupporting

confidence: 90%

“…Codenitrification, which can occur by both fungi and bacteria, can produce N 2 O and N 2 through reduction of nitrite by other N compounds, such as hydroxylamine and salicylhydroxamic acid (Spott & Florian Stange, 2011). Therefore, codenitrification can produce 29 N 2 in the presence of 15 NO 3 − , resulting in higher 29 N 2 production rate and anammox rate in the 15 NO 3 − + NH 4 + incubation than in the NO 3 − + 15 NH 4 + incubation (Tang et al., 2018; Xi et al., 2016). Our results suggest codenitrification may be a possible N 2 production process in coastal sediments, with the average relative contribution of 4.7% (Figure S3 in Supporting Information S1).…”

Section: Discussionmentioning

confidence: 99%

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Biotic and Abiotic Controls on Dinitrogen Production in Coastal Sediments

Sun

Wang

et al. 2021

Global Biogeochemical Cycles

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Nitrogen (N) is an essential nutrient that limits marine primary productivity and biogeochemical processes across a range of spatial and temporal scales (Canfield et al., 2010;Vitousek & Howarth, 1991). Historically, microbial N fixation has been the primary N source that converts dinitrogen gas (N 2 ) to biologically available forms, while denitrification has traditionally been recognized as the most important pathway through which fixed N is converted back to atmosphere (Devol, 2015). In response to 20 century increases N fertilizer inputs and fossil fuel combustion, however, studies suggest that ∼20% of N inputs to the modern ocean now occurs via terrestrial nutrient runoff and atmospheric deposition (Canfield et al., 2010;Seitzinger, 2008). The fate of such inputs is controversial, given that microbial processes in shelf sediments may consume a significant fraction of anthropogenic N inputs before they enter the open ocean. Substantial uncertainty surrounds how much N is lost to N 2 in marine sediments (

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Biotic and Abiotic Controls on Dinitrogen Production in Coastal Sediments

Sun

Wang

et al. 2021

Global Biogeochemical Cycles

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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].…”

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

confidence: 93%

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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“…Recent studies have suggested that chronic N deposition into temperate habitats may offer sufficient N inputs to these ecosystems (Hedin et al, 2009) causing N saturation (Nair, 2014;Tian et al, 2016). There is evidence that these N saturation effects may also be impacting tropical environments (Chen et al, 2016;Tang et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Nitrogen and phosphorus enrichment cause declines in invertebrate populations: a global meta‐analysis

et al. 2021

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Human-driven changes in nitrogen (N) and phosphorus (P) inputs are modifying biogeochemical cycles and the trophic state of many habitats worldwide. These alterations are predicted to continue to increase, with the potential for a wide range of impacts on invertebrates, key players in ecosystem-level processes. Here, we present a meta-analysis of 1679 cases from 207 studies reporting the effects of N, P, and combined N + P enrichment on the abundance, biomass, and richness of aquatic and terrestrial invertebrates. Nitrogen and phosphorus additions decreased invertebrate abundance in terrestrial and aquatic ecosystems, with stronger impacts under combined N + P additions. Likewise, N and N + P additions had stronger negative impacts on the abundance of tropical than temperate invertebrates. Overall, the effects of nutrient enrichment did not differ significantly among major invertebrate taxonomic groups, suggesting that changes in biogeochemical cycles are a pervasive threat to invertebrate populations across ecosystems. The effects of N and P additions differed significantly among invertebrate trophic groups but N + P addition had a consistent negative effect on invertebrates. Nutrient additions had weaker or inconclusive impacts on invertebrate biomass and richness, possibly due to the low number of case studies for these community responses. Our findings suggest that N and P enrichment affect invertebrate community structure mainly by decreasing invertebrate abundance, and these effects are dependent on the habitat and trophic identity of the invertebrates. These results highlight the important effects of human-driven nutrient enrichment on ecological systems and suggest a potential driver for the global invertebrate decline documented in recent years.

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Effects of long-term increased N deposition on tropical montane forest soil N2 and N2O emissions

Abstract: This is a repository copy of Effects of long-term increased N deposition on tropical montane forest soil N and N O emissions ₂ ₂ .

Cited by 47 publications

References 60 publications

Biotic and Abiotic Controls on Dinitrogen Production in Coastal Sediments

Biotic and Abiotic Controls on Dinitrogen Production in Coastal Sediments

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

Nitrogen and phosphorus enrichment cause declines in invertebrate populations: a global meta‐analysis

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