Contribution of Anammox to Nitrogen Removal in Two Temperate Forest Soils

Xi, Dangpeng; Bai, Ren Yuan; Zhang, Limei; Fang, Yunting

doi:10.1128/aem.00888-16

Cited by 55 publications

(45 citation statements)

References 54 publications

(99 reference statements)

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“…Several processes might play a role for N 2 losses, including ammonium oxidation coupled to nitrite reduction (anammox; Xi et al. ). In specific for these sites, however, it seems more likely that ammonium oxidation coupled to iron reduction (i.e., Feammox) or other forms of chemo‐denitrification play an important role in soils with high Fe content (Yang et al.…”

Section: Discussionmentioning

confidence: 99%

Contrasting nitrogen fluxes in African tropical forests of the Congo Basin

Bauters

Verbeeck

Rütting

et al. 2019

Ecological Monographs

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The observation of high losses of bioavailable nitrogen (N) and N richness in tropical forests is paradoxical with an apparent lack of N input. Hence, the current concept asserts that biological nitrogen fixation (BNF) must be a major N input for tropical forests. However, well‐characterized N cycles are rare and geographically biased; organic N compounds are often neglected and soil gross N cycling is not well quantified. We conducted comprehensive N input and output measurements in four tropical forest types of the Congo Basin with contrasting biotic (mycorrhizal association) and abiotic (lowland–highland) environments. In 12 standardized setups, we monitored N deposition, throughfall, litterfall, leaching, and export during one hydrological year and completed this empirical N budget with nitrous oxide (N2O) flux measurement campaigns in both wet and dry season and in situ gross soil N transformations using 15N‐tracing and numerical modeling. We found that all forests showed a very tight soil N cycle, with gross mineralization to immobilization ratios (M/I) close to 1 and relatively low gross nitrification to mineralization ratios (N/M). This was in line with the observation of dissolved organic nitrogen (DON) dominating N losses for the most abundant, arbuscular mycorrhizal associated, lowland forest type, but in contrast with high losses of dissolved inorganic nitrogen (DIN) in all other forest types. Altogether, our observations show that different forest types in central Africa exhibit N fluxes of contrasting magnitudes and N‐species composition. In contrast to many Neotropical forests, our estimated N budgets of central African forests are imbalanced by a higher N input than output, with organic N contributing significantly to the input‐output balance. This suggests that important other losses that are unaccounted for (e.g., NOx and N2 as well as particulate N) might play a major role in the N cycle of mature African tropical forests.

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Section: Discussionmentioning

confidence: 99%

Contrasting nitrogen fluxes in African tropical forests of the Congo Basin

Bauters

Verbeeck

Rütting

et al. 2019

Ecological Monographs

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“…In addition, the spring snow thaw can increase soil moisture and probably results in a large input of available C from the forest organic layer (Supplementary Table S1) into mineral soils. The anaerobic environment and increased dissolved organic matter and NH 4 + -N concentrations in the soil during spring thaw period can promote the codenification process, which has been still unclear in forest soils so far (Xi et al, 2016). Field experiments should be done in the future to study the effect of C and N addition on N 2 O and CO 2 fluxes from soils with different water contents during the spring thaw period and their microbial mechanisms.…”

Section: Discussionmentioning

confidence: 99%

Effect of carbon and nitrogen addition on nitrous oxide and carbon dioxide fluxes from thawing forest soils

Wu¹,

Xu²,

Duan³

et al. 2017

International Agrophysics

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A b s t r a c t. Packed soil-core incubation experiments were done to study the effects of carbon (glucose, 6.4 g C m -2 ) and nitrogen (NH 4 Cl and KNO 3 , 4.5 g N m -2 ) addition on nitrous oxide (N 2 O) and carbon dioxide (CO 2 ) fluxes during thawing of frozen soils under two forest stands (broadleaf and Korean pine mixed forest and white birch forest) with two moisture levels (55 and 80% water-filled pore space). With increasing soil moisture, the magnitude and longevity of the flush N 2 O flux from forest soils was enhanced during the early period of thawing, which was accompanied by great NO 3 --N consumption. Without N addition, the glucose-induced cumulative CO 2 fluxes ranged from 9.61 to 13.49 g CO 2 -C m -2 , which was larger than the dose of carbon added as glucose. The single addition of glucose increased microbial biomass carbon but slightly affected soil dissolved organic carbon pool. Thus, the extra carbon released upon addition of glucose can result from the decomposition of soil native organic carbon. The glucose-induced N 2 O and CO 2 fluxes were both significantly correlated to the glucose-induced total N and dissolved organic carbon pools and influenced singly and interactively by soil moisture and KNO 3 addition. The interactive effects of glucose and nitrogen inputs on N 2 O and CO 2 fluxes from forest soils after frost depended on N sources, soil moisture, and vegetation types.

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“…In surface soils of paddyfield, the contribution of anammox to N‐loss only accounted for below 15% (0.6%–15%, Yang et al ., ; 4.48%–9.23%, Shan et al ., ; and 12%–15%, Zhu et al ., ), but in subsurface soils (1 m) the contribution can reach up to 37% (Zhu et al ., ). However, in contrast to wetland soils, anammox only has been reported in forest upland surface soils (0–40 cm, Xi et al ., ) and agricultural upland surface soils (0–30 cm, Long et al ., ), of which anammox contributed up to 7% of N‐loss. To date, the contribution and role of anammox for N‐loss in agricultural upland soil profiles and subsurface soils (below 1 m) are still unknown.…”

Section: Introductionmentioning

confidence: 99%

Microbial pathways for nitrogen loss in an upland soil

Zhu

Wang

et al. 2018

Environmental Microbiology

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The distribution and importance of anaerobic ammonium oxidation (anammox) and nitrite-dependent anaerobic methane oxidation (n-damo) have been identified in aquatic ecosystems; their role in agricultural upland soils however has not yet been well investigated. In this study, we examined spatio-temporal distributions of anammox and n-damo bacteria in soil profiles (300 cm depth) from an agricultural upland. Monitoring nitrogen (N) conversion activity using isotope-tracing techniques over the course of one year showed denitrification (99.0% N-loss in the winter and 85.0% N-loss in the summer) predominated over anammox (1.0% N-loss in the winter and 14.4% N-loss in the summer) and n-damo (0.6% N-loss in the winter) in surface soils (0-20 cm). While below 20 cm depth, N-loss was dominated by anammox (79.4 ± 14.3% in the winter and 65.4 ± 12.5% in the summer) and n-damo was not detected. Phylogenetic analysis showed that Candidatus Brocadia anammoxidans dominated the anammox community in the surface soil and Candidatus Brocadia fulgida dominated below 20 cm depth. Dissimilatory nitrate reduction to ammonium (DNRA), another nitrite reduction process, was found to play a limited role (4.9 ± 3.5%) in the surface soil compared with denitrification; below 80 cm DNRA rates were much higher than rates of anammox and denitrification. Ammonium oxidation was the main source of NO2- above 80 cm (70.9 ± 23.3%), the key influencing factor on anammox rates, and nitrate reduction (100%) was the main NO2- source below 80 cm. Considering the anammox, n-damo and denitrification rates as a whole in the sampled soil profile, denitrification is still the main N-loss process in upland soils.

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Contribution of Anammox to Nitrogen Removal in Two Temperate Forest Soils

Cited by 55 publications

References 54 publications

Contrasting nitrogen fluxes in African tropical forests of the Congo Basin

Contrasting nitrogen fluxes in African tropical forests of the Congo Basin

Effect of carbon and nitrogen addition on nitrous oxide and carbon dioxide fluxes from thawing forest soils

Microbial pathways for nitrogen loss in an upland soil

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