In-situ N2O and N2 data improved N budget simulation with APSIM and LandscapeDNDC in tropical sugarcane systems DOI Creative Commons
Naoya Takeda, Johannes Friedl, David Rowlings

et al.

Agriculture Ecosystems & Environment, Journal Year: 2024, Volume and Issue: 375, P. 109193 - 109193

Published: July 23, 2024

Denitrification is a key process in the global nitrogen (N) cycle, causing nitrous oxide (N2O) and dinitrogen (N2) emissions. Biogeochemical models allow field-scale estimates of N2O N2, extrapolating important yet often limited experimental results. However, such predictions rely mostly on data, lack N2 data hinders validating total denitrification, which remain major uncertainty for N budgets. This study investigated denitrification losses budgets two tropical sugarcane systems using Agricultural Production Systems sIMulator (APSIM) LandscapeDNDC (LDNDC) simulation framework unique dataset both emissions measured field over complete growing season. Key soil parameters influencing APSIM LDNDC were identified via sensitivity analysis, followed by generalised likelihood estimation to determine their posterior distributions (i) only (ii) data. The improved calibration approaches, resulting 0.7–1.3 kg ha−1 RMSE. simulated increased agreed better with observed values when calibrated (RMSE 30.1–45.0 before 19.3–19.9 after). loss pathway shifted from leaching after including N2. balance was larger residues retained as compared burning consistently across different parameter configurations. These findings indicate that biogeochemical models, used default or are likely underestimate (>50 %), leading bias simulation. Accurate essential understanding long-term management impacts organic matter dynamics, demonstrated denote mining burnt, potential sequester cane retained. outcomes emphasise importance integrating in-situ measurements exercises, ensuring more accurate budget scales.

Language: Английский

The anaerobic soil volume as a controlling factor of denitrification: a review DOI Creative Commons
Steffen Schlüter, Maik Lucas, Balázs Grosz

et al.

Biology and Fertility of Soils, Journal Year: 2024, Volume and Issue: unknown

Published: April 16, 2024

Abstract Denitrification is an important component of the nitrogen cycle in soil, returning reactive to atmosphere. activity often concentrated spatially anoxic microsites and temporally ephemeral events, which presents a challenge for modelling. The anaerobic fraction soil volume can be useful predictor denitrification soils. Here, we provide review this characteristic, its controlling factors, estimation from basic properties implementation current models. concept relationship has undergone several paradigm shifts that came along with advent new oxygen microstructure mapping techniques. understanding hotspots are partially decoupled air distances wet matrix mainly associated particulate organic matter (POM) form fresh plant residues or manure. POM fragments harbor large amounts labile carbon promote local consumption and, as result, these differ their aeration status surrounding matrix. Current models relate bulk concentration various ways but make little use information, such distance between air-filled pores. Based on meta-analyses, derive empirical relationships estimate conditions formation anoxia at microscale outline how could used future improve prediction accuracy profile scale.

Language: Английский

Citations

21
Estimating global terrestrial denitrification from measured N2O:(N2O + N2) product ratios DOI Creative Commons
Clemens Scheer, Kathrin Fuchs, David E. Pelster

et al.

Current Opinion in Environmental Sustainability, Journal Year: 2020, Volume and Issue: 47, P. 72 - 80

Published: Sept. 24, 2020

The use of nitrogen (N) fertilizers and cultivation N-fixing crops has grown exponentially over the last century, with severe environmental consequences. Most anthropogenic reactive will ultimately be returned by denitrification to atmosphere as inert N2, but magnitude ratio N2O (N2O + N2) emitted (RN2O) is unknown for vast majority terrestrial ecosystems. This paper provides estimates RN2O reviewing existing literature compiling a N budget global land surface. We estimate that doubled from 80 Tg-N year−1 in pre-industrial times 160 2005 mean approximately 0.08. conclude upscaling can provide spatial when data acetylene inhibition methods are excluded. Recent advances methodologies measure N2 emissions under field conditions could open way more effective management flows.

Language: Английский

Citations

92
Potential denitrification activity response to long-term nitrogen fertilization - A global meta-analysis DOI
Longcheng Li, Mengying Yang, Jincheng Li

et al.

Journal of Cleaner Production, Journal Year: 2022, Volume and Issue: 336, P. 130451 - 130451

Published: Jan. 10, 2022

Language: Английский

Citations

27
Strategies for mitigating N2O and N2 emissions from an intensive sugarcane cropping system DOI Creative Commons
Johannes Friedl, D. Warner, Weijin Wang

et al.

Nutrient Cycling in Agroecosystems, Journal Year: 2023, Volume and Issue: 125(2), P. 295 - 308

Published: Feb. 25, 2023

Abstract In sugarcane cropping systems, high rates of N fertiliser are typically applied as sub-surface bands creating localised zones mineral concentrations. This in combination with levels crop residue (trash) retention and a warm humid climate creates conditions that known to promote soil denitrification, resulting emissions the potent greenhouse gas 2 O. These losses illustrate inefficient use fertilisers but total denitrification form O remain largely unknown. We used 15 flux method investigate effect cane trash removal nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) on commercial farm at Bundaberg, Australia. High gaseous were observed under standard grower practice where application (145 kg ha −1 urea) resulted (36.1 ) from subsurface band, more than 50% these emitted Cane reduced emission by 34% 51%, had no O/(N + O) ratio. The DMPP lowered 35% 98%, respectively, reducing percentage (N only 4%. conclude is an effective strategy reduce losses, minimise emissions, while keeping benefits systems.

Language: Английский

Citations

14
Effects of long-term nitrogen fertilization on N2O, N2 and their yield-scaled emissions in a temperate semi-arid agro-ecosystem DOI
Fiston Bizimana, Arbindra Timilsina, Wenxu Dong

et al.

Journal of Soils and Sediments, Journal Year: 2021, Volume and Issue: 21(4), P. 1659 - 1671

Published: March 1, 2021

Language: Английский

Citations

31
Universal temperature sensitivity of denitrification nitrogen losses in forest soils DOI
Haoming Yu, Yihang Duan, Jan Mulder

et al.

Nature Climate Change, Journal Year: 2023, Volume and Issue: 13(7), P. 726 - 734

Published: June 22, 2023

Language: Английский

Citations

12
The 15N-Gas flux method for quantifying denitrification in soil: Current progress and future directions DOI Creative Commons
Gianni Micucci, Fotis Sgouridis, Niall P. McNamara

et al.

Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 184, P. 109108 - 109108

Published: June 22, 2023

Denitrification in soil is a challenging process to quantify under situ conditions, which seriously hampers the ability accurately close or balance nitrogen budget of terrestrial ecosystems. The 15N Gas Flux method one best-suited techniques for measurement denitrification. Using stable 15N-NO3- tracer injected applied on surface closed static chamber, this enables both N2O and N2 denitrification fluxes. Its main limitation certainly poor sensitivity towards emissions, common weakness all methods. We have also identified 4 assumptions technique relies be accurate: 1) distributed homogenously confined volume, leading formation single isotopic pool equilibrium, 2) absence hybrid molecule forming processes, 3) quantitative recovery produced products flux chamber headspace (no diffusive losses) 4) no stimulatory impacts nitrate addition dynamics process. In review, we revisit principles method, explore its evolution through time as well different models calculation that been developed; before assessing impact above-mentioned literature compilation simulation. Finally, elaborate discuss key technical aspects help reader understanding optimally applying outcome review shows order address (poor sensitivity), approach using an artificial N2-depleted atmosphere seems promising lead, although only few studies used it so far (even less field). particular, demonstrate here existence threshold 10% atmospheric concentration background, below increases drastically. show mentioned above are unlikely fully fulfilled field. non-homogenous distribution has shown by various authors cause 25% underestimation rate at maximum. Through simulation, presence molecules should moderate total fluxes (N2 similarly) long they contribute more than 50% emissions (at point 12.5% overestimation). due subsoil diffusion, reported high 37%, remains challenge quantify. substrate water additions hypothetical stimulation needs further validation. A decision tree implemented end study users optimally. Overall, our findings still holds substantial promise accurate quantification whilst considering recommended mitigation methodological weaknesses future research.

Language: Английский

Citations

11
Determining N2O and N2 fluxes in relation to winter wheat and sugar beet growth and development using the improved 15N gas flux method on the field scale DOI Creative Commons

Jonas Eckei,

Reinhard Well, Martin Maier

et al.

Biology and Fertility of Soils, Journal Year: 2024, Volume and Issue: unknown

Published: April 4, 2024

Abstract The objectives of this field trial were to collect reliable measurement data on N 2 emissions and O/(N O + ) ratios in typical German crops relation crop development provide a dataset test improve biogeochemical models. winter wheat (WW, Triticum aestivum L.) sugar beet (SB, Beta vulgaris subsp. measured using the improved 15 gas flux method with helium–oxygen flushing (80:20) reduce atmospheric background < 2%. To estimate total production soil, production-diffusion modelling was applied. Soil samples taken regular intervals analyzed for mineral (NO 3 − NH 4 water-extractable Corg content. In addition, we monitored soil moisture, development, plant uptake, transformation processes translocation deeper layers. Our best estimates cumulative losses 860.4 ± 220.9 mg m −2 553.1 96.3 over experimental period 189 161 days 0.12 0.15 WW SB, respectively. Growing plants affected all controlling factors denitrification, dynamics clearly differed between species. Overall, highest when water uptake low, i.e., during early growth stages, ripening, after harvest. We present first plot-scale study employing growing season showing that drivers fluxes differ species change throughout season.

Language: Английский

Citations

4
Long‐Term 15N Balance After Single‐Dose Input of 15N‐Labeled NH4+ and NO3− in a Subtropical Forest Under Reducing N Deposition DOI
Danni Xie, Lei Duan,

Gaoyue Si

et al.

Global Biogeochemical Cycles, Journal Year: 2021, Volume and Issue: 35(7)

Published: July 1, 2021

Abstract Nitrogen (N) deposition in Europe and North America decreased the 1990s, whereas N China began to decline early 2010s. The response of temperate forests decreasing implied a delay recovery, but it remains unknown whether recovery subtropical follows similar trend. Therefore, effects on leaching were simulated an N‐saturated forest southwest following ten years application 4.00 g m −2 yr −1 . addition (NH 4 + or NO 3 − ) was stopped 2014. In 2017, single in‐situ 15 as NH performed trace fate under reducing deposition. Combining monitoring results fluxes fates, both actual contribution “new” input significantly reduced input. termination resulted immediate decreases mineralization immobilization rates, which even lower than those control plots with moderate (naturally occurring) reduction. ratio from also reduced, implying critical role saturation. Because still N‐saturated, slightly gross (including mineralization). significant decrease thus may occur due

Language: Английский

Citations

24
Nonlinear response of N2O and N2 emissions to increasing soil nitrate availability in a tropical sugarcane soil DOI Creative Commons
Robert Kirkby, Johannes Friedl, Naoya Takeda

et al.

Journal of Soils and Sediments, Journal Year: 2023, Volume and Issue: 23(5), P. 2065 - 2071

Published: March 9, 2023

Abstract Purpose The reduction of the greenhouse gas nitrous oxide (N 2 O) to dinitrogen ) via denitrification and N O source partitioning between nitrification remain major uncertainties in sugarcane systems. We therefore investigated magnitude product stoichiometry production pathways from a tropical soil response increasing nitrate (NO 3 − availability. Methods Microcosms were established using (Qld, Australia) emissions measured following fertilisation with 15 NO –N equivalent 25, 50 100 μg g −1 soil, simulating contents previously observed situ, mimicking flood irrigation by wetting close saturation. Results Cumulative increased exponentially availability, while cumulative followed an exponential increase maximum. Average daily exceeded 5 µg accounted for > 99% denitrification. suggests preferential even when levels had only diminishing effect on overall rate. fraction emitted was function water, heterotrophic respiration. Conclusions Our findings show driven excess , though complete dominated low O/(N + ratio questions use as proxy rates, highlighting need in-situ measurements account losses

Language: Английский

Citations

10