Effect of freeze-thaw cycles on nitrogen retention in an alpine topsoil amended with peanut shell hydrochar.

High-performance detection of nitrogen in soil using superhydrophobic-hydrophilic array and silver nano dual-structure assisted molecular laser-induced breakdown spectroscopy.

Earthworms (Metaphire guillelmi) enhance soil carbon and nitrogen cycling by alleviating the pH decline and inhibition of soil enzyme activity resulting from HCBD contamination.

Effects of plant and microbial biodiversity on soil nitrogen and phosphorus accumulation under ecological restoration of Alpine Sandy Land in Northwest Sichuan

Long-term agricultural land use suppresses nitrification and reverses the thermal sensitivity of nitrogen mineralization via subsoil microbial networks.

Wildfires drastically alter biogeochemical cycling and transport of nutrient elements, including nitrogen (N), from terrestrial to aquatic ecosystems, with the potential to degrade water quality. Understanding the impact of characteristics of wildfire-derived ashes and burned soils on the mobilization of N is essential for effectively managing wildfires and mitigating adverse effects on watershed functions. This study quantified the mobility of N in soils and ashes influenced by wildfires in the northern California/Nevada region in the western United States (Dixie, Beckwourth, and Caldor fires) and the impact of soil/ash characteristics. The mobile fraction of N ranged from 0.025-0.070 for the ashes, and the mobile fraction of N was composed of 13.1-39.6% as NO3-, up to 0.011% as NO2-, 0.004-86.9% as NH3/NH4+, and up to 49.4% as dissolved organic N. The speciation indicates possible nitrification occurring during the wildfires, but suggests no substantial denitrification. The mobile fraction of N was 11.3 ± 7.4 times that of organic carbon (OC), due to the high mobility of inorganic N (mainly NO3- and NH3/NH4+) and nitrogenous organic compounds. The mobile N fraction was associated with redox reactions of iron during wildfires, and was regulated by the redox reactivity of OC. N mobility in the ashes was lower than in control soils, potentially due to the transformation in the speciation of N. However, the total amount of mobile N was increased by wildfire, with the amount of increase being closely related to the severity of wildfires. Overall, wildfires lead to more mobile N, including both organic and inorganic N regulated by redox reactions and severity of wildfires, with subsequent concerns for water quality and water/wastewater treatment processes.

The content of mineral forms of nitrogen in light soil fertilized with various doses of sewage sludge

Impact of tire particles and tire leachate contaminants on plant physiology and soil health: Case study in mung bean and tomato.

Quantitative microbial element cycling reveals distinct functional characteristics associated with soil carbon and nitrogen cycling in clear-cut black locust plantations in winter

Differentiated responses of dissolved organic matter molecular properties in surface and bottom soil layers to perfluoroalkyl and polyfluoroalkyl substances pollution.

Soil carbon, nitrogen and phosphorus contents prediction based on hyperspectral images combined with attention mechanism multi-scale dual-branch network

Evaluating the effects of biodegradable film and plastic film mulching on soil water and nitrogen cycles and maize yield in different regions of rainfall and soil texture: An experimental and modeling study

Nitrogen deposition accelerates litter decomposition in peri-urban forests with species-specific responses.

Soil aggregates, carbon and nitrogen content, and water retention across land uses in the Reshui River Catchment

Divergent response of soil nitrogen and ammonia-oxidizing microorganisms to alfalfa-wheat rotation system under precipitation variability in semi-arid region

Nonylphenol induces nitrous oxide production in agricultural soils by facilitating gross nitrogen mineralization.

Biochar amendment improves Morchella sextelata yield by enhancing soil NO3--N availability and increasing the diversity while decreasing the absolute abundance of fungal community.

Soil nitrogen dynamics regulate differential nitrogen uptake between rice and upland crops

Are iron and manganese key factors in nitrate attenuation within the shallow groundwater of the nitrogen attenuation zone?

Carbon-nitrogen coupling in plateau lake ecosystems: Dual-isotope fingerprints of climate warming and anthropogenic intensification.