Gross N transformation rates and related N2O emissions in Chinese and UK agricultural soils

Zhu, Gaodi; Song, Xiaotong; Ju, Xiaotang; Zhang, Jinbo; Müller, Christoph; Sylvester‐Bradley, R.; Thorman, R. E.; Bingham, I. J.; Rees, Robert M.

doi:10.1016/j.scitotenv.2019.02.241

Cited by 57 publications

(36 citation statements)

References 70 publications

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“…Gross N transformation rates were quantified using a 15 N tracing approach (Kirkham and Bartholomew, 1954;Müller et al, 2007;Zhang et al, 2012;Zhu et al, 2019). Each soil treatment was conducted in two sub-treatments, adding 15 NH4NO3 and NH4 15 NO3, respectively, with 3 replicates and 3 extraction times.…”

Section: Laboratory 15 N Tracing Experimentsmentioning

confidence: 99%

“…The soils were adjusted to 60% WHC with high-purity water. 60% of WHC is widely used in previous studies, being an appropriate water potential to promote microbial activity under aerobic conditions (Zhang et al, 2012;Zhu et al, 2019). The bottles were sealed with parafilm® with uniformly distributed eight pinholes to allow aeration, and incubated in the dark for 48 h at 20 °C.…”

Section: Laboratory 15 N Tracing Experimentsmentioning

confidence: 99%

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Chronic nitrogen addition differentially affects gross nitrogen transformations in alpine and temperate grassland soils

Hao

Zhang

et al. 2020

Soil Biology and Biochemistry

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Nitrogen (N) deposition can profoundly alter soil N cycling of grassland ecosystems.Substrates and soil acidification are expected to modify soil N transformations in response to elevated N deposition. Here, we carried out 15 N tracing studies to test the effects of N addition rates (low: 30 kg N ha -1 and high: 90/120 kg N ha -1 ) and soil acidification on gross N transformation rates using two typical Chinese grassland soils, an alpine calcareous soil and a temperate neutral soil. We found that N addition significantly increased the ratio of gross nitrification rate to gross ammonia immobilization rate (N/I) in both soils, but gross N transformation rates changed differently as a function of N addition rates and soil types. In the calcareous soil, N addition increased soil gross N transformations, largely due to mineral N substrates, SOC, TN and fungal dominance. In contrast, low N addition did not affect gross N transformation rates in the neutral soil, but high N addition significantly decreased gross N transformation rates. Although both SOC and TN were increased with N addition in the neutral soil, N-induced soil pH decline decreased gross N transformation rates. Our results indicate that the effects of N addition on grassland soil gross N transformations are highly dependent on mineral N substrates, SOC and TN. Soil acidification played a more important role than SOC and TN in gross N transformation rate changes in response to elevated N deposition. These findings suggest that the different changes of gross N transformation rates in response to N deposition and soil properties (e.g. SOC, TN and soil pH) should be integrated into biogeochemical models to better predict grassland ecosystem N cycling in the future scenarios of N deposition.

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Section: Laboratory 15 N Tracing Experimentsmentioning

confidence: 99%

Section: Laboratory 15 N Tracing Experimentsmentioning

confidence: 99%

Chronic nitrogen addition differentially affects gross nitrogen transformations in alpine and temperate grassland soils

Hao

Zhang

et al. 2020

Soil Biology and Biochemistry

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“…In facing of the increasing concentration of atmospheric N2O, various management practices were used to improve nitrogen fertilizer utilization and regulate N2O emissions from cropland soils (Zhu et al 2019). Nitrification inhibitors like DCD can inhibit the conversion from NH4 + -N to NO2 -/NO3and thereafter reduce substrate from pathways generating N2O.…”

Section: Discussionmentioning

confidence: 99%

Effect of straw incorporation and nitrification inhibitor on nitrous oxide emission in various cropland soils and its microbial mechanism

Zhang

Wang

et al. 2021

Preprint

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Nitrification inhibitor and straw incorporation are widely used to improve crop nitrogen use efficiency in agricultural soil, but their effects on nitrous oxide (N2O) emission across different soil types and the microbial mechanisms remain less understood. In this study, we used controlled experiment and DNA-based molecular analysis to study how nitrification inhibitor (dicyandiamide, DCD) and straw incorporation affect soil nitrogen balance, N2O emission and microbial nitrifiers/denitrifers in three distinct agricultural soils (the black, fluvo-aquic and red soils) across China. Both DCD and straw incorporation improved nitrogen balance by increasing NH4+ and decreasing NO3- in all soils. DCD tended to decrease N2O emission from all soils especially the Fluvo-aquic one, while straw incorporation reduced N2O emission only in the fluvo-aquic soil but increased N2O emission in the other two especially the red soil (by ~600%). T-RFLP analysis revealed that the denitriers community structure are distinct among the three soils, but was not strongly affected by DCD or straw incorporation. qPCR analysis revealed that DCD or straw incorporation had no significant effect on nitrifier abundance, but increased nitrous oxide reductase nosZ gene abundance in the black/fluvo-aquic soil rather than the red soil. Structural equational modelling further confirmed that, when accounting for treatments and soil properties, nosZ gene abundance is the only biological factor significantly determined N2O emission in different soil types. Taken together, our work advanced the knowledge on the agricultural practices and N2O emission in cropland soils, and suggested that straw incorporation may not be a good choice for the red and black soil areas; management practices should be used as per soil type to balance between nitrogen use efficiency and N2O emission.

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“…A second process contributing to emissions is denitrification which occurs when the nitrate ion is reduced during the process of microbial respiration. Such conditions commonly arise in wet soils containing a plentiful carbon and nitrogen supply [6] . In these conditions soil oxygen becomes depleted through respiration and microbes switch to nitrate as a terminal electron acceptor in order to maintain metabolic activity.…”

Section: Introductionmentioning

confidence: 99%

“…In many agricultural soils the processes of nitrification and denitrification occur simultaneously but are strongly influenced by environmental and management controls [6] . Soil nitrogen supply, moisture content and temperature are recognized as particularly important factors in influencing emissions [7] .…”

Section: Introductionmentioning

confidence: 99%

Mitigating nitrous oxide emissions from agricultural soils by precision management

Rees¹,

Maire²,

Florence³

et al. 2020

Front. Agr. Sci. Eng.

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Nitrous oxide (N 2 O) emissions make up a significant part of agricultural greenhouse gas emissions. There is an urgent need to identify new approaches to the mitigation of these emissions with emerging technology. In this short review four approaches to precision managements of agricultural systems are described based on examples of work being undertaken in the UK and New Zealand. They offer the opportunity for N 2 O mitigation without any reduction in productivity. These approaches depend upon new sensor technology, modeling and spatial information with which to make management decisions and interventions that can both improve agricultural productivity and environmental protection.

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Gross N transformation rates and related N2O emissions in Chinese and UK agricultural soils

Cited by 57 publications

References 70 publications

Chronic nitrogen addition differentially affects gross nitrogen transformations in alpine and temperate grassland soils

Chronic nitrogen addition differentially affects gross nitrogen transformations in alpine and temperate grassland soils

Effect of straw incorporation and nitrification inhibitor on nitrous oxide emission in various cropland soils and its microbial mechanism

Mitigating nitrous oxide emissions from agricultural soils by precision management

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