Effects of long-term (70 years) nitrogen fertilization and liming on carbon storage in water-stable aggregates of a semi-arid grassland soil

Buthelezi, Kwenama; Buthelezi‐Dube, Nkosinomusa Nomfundo

doi:10.1016/j.heliyon.2021.e08690

Cited by 4 publications

(3 citation statements)

References 71 publications

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“…Nitrogen had a negligible effect on the distribution of aggregates of different sizes in temperate grasslands (Y. Liu et al, 2022). However, long‐term nitrogen (N) fertilization may lead to disintegration of soil aggregates due to soil acidification by increasing monovalent ions (NH 4 + , H + ) and the reduction of microbial biomass carbon in a soil from semiarid grassland (Buthelezi & Buthelezi‐Dube, 2022; Guo et al, 2022). The previous study also reported that N additions improved the MWD of soil aggregates because of increases in the macro‐aggregate percentage and reductions in the silt‐clay portion, whereas the enhancement degree was variable in the terrestrial ecosystems, as well as the rate, form, and duration time of the N addition from a meta‐analysis (Lu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Nutrient addition affects stability of soil organic matter and aggregate by altering chemical composition and exchangeable cations in desert steppe in northern China

et al. 2022

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Nitrogen and phosphorus can influence the stability of soil organic matter (SOM) and aggregate, which are important for ecosystem functions. However, understanding remains limited regarding the impact of nutrient addition on soil aggregate stability, aggregate‐relevant organic matter and nutrients in desert steppe. Here, we studied the variation of soil aggregate stability, nutrients, and the exchangeable cations distribution characteristics, and the chemical composition and thermal stability of SOM were analyzed using thermogravimetric (TG) and Fourier transformed infrared spectroscopy. Samples of soil were collected under four conditions, phosphorus addition (P), nitrogen addition (N), combined phosphorus and nitrogen addition (NP), and no addition (CK), from 0 to 10 cm depth over 4‐year experiments in desert steppe in northern China. The percentage of micro‐aggregates (0.25–0.053 mm) and large macroaggregates (>2 mm) dramatically increased by 34.2% and 18.1%, respectively, under the N treatment condition compared to the CK treatment, and micro‐aggregate content significantly increased under the P treatment, respectively. Nitrogen addition significantly increased the soil aggregate stability index, but the P addition reduced their value. The both macro‐aggregates (>0.25 mm) and silt‐clay (<0.053 mm) were preferentially enriched with soil nutrients and the exchangeable cations. The N and P addition was beneficial to nutrients accumulating in macro‐aggregates, and enhanced the aliphatic‐C and aromatic‐C abundances respectively. The TG‐T50 value (i.e., temperature when 50% of SOM is lost) increased after nutrient addition, indicating that the SOM has higher thermal stability, especially in the micro‐aggregates. The addition of N may have potentially a greater influence on aggregate stability through their influence exchangeable polyvalent cations (Ca2+ and Mg2+), and stability of SOM was influenced by chemical composition and exchangeable K+, Na+, Ca2+ contents in desert steppe. Overall, nutrient addition effects stability of SOM and aggregate by altering chemical composition and exchangeable cations in desert steppe in northern China.

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Section: Introductionmentioning

confidence: 99%

Nutrient addition affects stability of soil organic matter and aggregate by altering chemical composition and exchangeable cations in desert steppe in northern China

et al. 2022

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“…The YP anticipation in MF treatment under saturated conditions probably occurred because of an increase in particle repulsion forces caused by the higher content of monovalent ions than divalent ions in the soil sorptive complex (K/Ca + Mg). Long‐term experiments in different soil types and climatic conditions have already shown mineral fertilizer application, such as urea, reduces soil aggregation by causing soil acidification, Ca 2+ and Mg 2+ leaching and increases monovalent ions (NH 4 + and H + ) levels, especially in management systems with soil ploughing or in no‐till systems with legume planting (Blanco‐Canqui et al., 2014; Buthelezi & Buthelezi‐Dube, 2022; Guo et al., 2022; Haynes & Naidu, 1998). Our results also show acidification in the MF treatment, lower Ca 2+ and Mg 2+ levels and an increase in K + saturation (0–5 and 5–15 cm layers).…”

Section: Discussionmentioning

confidence: 99%

Long‐term application of different organic and inorganic fertilizers in no‐tillage crops changes the soil microstructural viscoelasticity and shear resistance to transient stresses

Alves,

Holthusen,

Marchezan

et al. 2024

Soil Use and Management

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The processes involved in deformation, internal strength and stability of soils with long‐term application of fertilizers (organic and inorganic sources) remain poorly investigated and hence understood, particularly in agricultural systems under subtropical climatic conditions. We investigated how long‐term fertilizer management with organic and inorganic amendments in no‐till crops affects the microstructural stability of a sandy Alfisol under oscillatory shear. The study was conducted in southern Brazil on a 17‐year completely randomized block experiment with five fertilizer treatments: pig slurry (PS), cattle slurry (CS), pig deep litter (PDL), mineral fertilizer (MF) and control, i.e. unfertilized (CL). Soil samples were collected from two layers (0–5 and 5–15 cm) for physical and chemical analyses and evaluation of soil rheological properties under oscillatory shear at two matric potentials (0 and −10 kPa). Organic matter accumulation in soil provided by the PDL and CS fertilizers resulted in higher soil stability and elasticity under oscillatory shear, especially in the 0–5 cm layer. Conversely, MF and PS enhanced the soil susceptibility towards deformation under transient stresses, mainly in the 0–5 cm layer under saturated conditions. The PDL significantly increased soil shear resistance under low‐shear strain conditions. Significant differences ceased under high‐shear strain conditions, though PS and MF yielded at significantly lower strains. Hence, under subtropical conditions, long‐term application of organic fertilizers with fibrous components promoted soil microstructure strengthening, reducing soil susceptibility to erosive processes and compaction.

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“…The pH decrease in soil media occurred after the addition of ammonium. According to Corley and Tinker (2016); Buthelezi and Buthelezi-Dube (2022), the addition of ammonium sulfate significantly decreases soil pH. This occurred through the oxidation of ammonium to nitrate in the soil media was followed by the release of H + ions, resulting in soil acidification (Msimbira and Smith 2020).…”

Section: Effect Of Ammonium Enrichment On Nitrification Activitymentioning

confidence: 99%

Ammonium enrichment reduces the diversity and changes the composition of ammonia-oxidizing microbial communities in agricultural soil media

SAUKOLY,

MEITINIARTI,

NUGROHO

et al. 2024

Biodiversitas

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Abstract. Saukoly SA, Meitiniarti VI, Nugroho RA, Krave AS. 2024. Ammonium enrichment reduces the diversity and changes the composition of ammonia-oxidizing microbial communities in agricultural soil media. Biodiversitas 25: 916-923. Nitrification is the process of ammonium oxidation to form nitrites and nitrates. Ammonium availability in the soil is one of the factors influencing the activity, abundance, and diversity of ammonia-oxidizing microorganisms (AOM). This study aimed to determine the effect of enriching a soil media with different ammonium concentrations on the abundance and diversity of AOM as well as the potential for nitrification. Soil as the media was prepared from an agricultural land receiving cow dung sewage. The media was then placed in the microcosms, and was added to a nitrification medium containing ammonium at three levels; 0 (control soil), 200 (low ammonium-enriched soil), and 500 mg L-1 (high ammonium-enriched soil). The microcosms were further incubated for 42 days at room temperature. The nitrification potential determination was based on the formation of nitrite from ammonium oxidation. The abundance of AOM and the potential nitrification were measured every 14-day interval, including day 0 as the initial condition. The AOM composition was analyzed based on the similarity level of the amoA gene sequence to the NCBI BLAST GenBank database. However, this analysis was only conducted for the control and high ammonium-enriched soil. This study indicated that ammonium enrichment increased the nitrification activity and the abundance of AOM, but it decreased the diversity of AOM communities. There were positive correlations between nitrification and nitrate potential, as well as between ammonium content and AOM abundance. Negative correlations appeared between pH and nitrification potential, nitrate concentrations, ammonium concentrations, and MPN. The diversity of ammonium-oxidizing archaea (AOA) in the control soil was higher than in the high ammonium-enriched soil. The enrichment with ammonium also changed the AOA composition. The Candidatus Nitrosocosmicus oleophilus strain of the MY3 chromosome was the most dominant archaea in the control and high ammonium-enriched soil. This implies that the high diversity of AOA in this soil may be beneficial for further use of the soil as a source for inocula in the development of nitrifiers-based biofertilizers.

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Effects of long-term (70 years) nitrogen fertilization and liming on carbon storage in water-stable aggregates of a semi-arid grassland soil

Cited by 4 publications

References 71 publications

Nutrient addition affects stability of soil organic matter and aggregate by altering chemical composition and exchangeable cations in desert steppe in northern China

Nutrient addition affects stability of soil organic matter and aggregate by altering chemical composition and exchangeable cations in desert steppe in northern China

Long‐term application of different organic and inorganic fertilizers in no‐tillage crops changes the soil microstructural viscoelasticity and shear resistance to transient stresses

Ammonium enrichment reduces the diversity and changes the composition of ammonia-oxidizing microbial communities in agricultural soil media

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