scholarly journals Inorganic nitrogen availability alters Eucalyptus grandis receptivity to the ectomycorrhizal fungus Pisolithus albus but not symbiotic nitrogen transfer

2019 ◽  
Vol 226 (1) ◽  
pp. 221-231 ◽  
Author(s):  
Krista L. Plett ◽  
Vasanth R. Singan ◽  
Mei Wang ◽  
Vivian Ng ◽  
Igor V. Grigoriev ◽  
...  
Keyword(s):  
Nitrogen Availability ◽  
Inorganic Nitrogen ◽  
Eucalyptus Grandis ◽  
Ectomycorrhizal Fungus ◽  
Nitrogen Transfer

Nitrogen cycling in a Venezuelan tropical seasonally flooded forest: soil nitrogen mineralization and nitrification

1994 ◽  
Vol 10 (3) ◽  
pp. 399-416 ◽  
Author(s):  
Barrios E. ◽  
Herrera R.
Keyword(s):  
Soil Nitrogen ◽  
Nitrogen Availability ◽  
Inorganic Nitrogen ◽  
Nitrogen Concentration ◽  
Ammonium Nitrogen ◽  
Wet Season ◽  
Flooded Forest ◽  
Nitrogen Concentrations ◽  
Minimum Stress ◽  
Seasonally Flooded

ABSTRACTSeasonally flooded forests represent a transition between terrestrial and aquatic ecosystems. The Mapire river, a tributary of the Orinoco river, floods its surrounding forests during the wet season (May–December). The soils are very acid and the total nitrogen concentration (0.1%) is only half that found in nearby soils flooded by Orinoco waters. Ammonium-nitrogen predominates in the soil during the flooded period while nitrate-nitrogen concentrations are higher in the dry period. Wide fluctuations in the inorganic nitrogen fractions did not considerably affect the annual course of soil nitrogen.The predominance of mineralization versus nitrification (56 and 5 μgsoil month−1respectively) and possibly the synchronization of nitrogen availability with plant demand could be considered as nitrogen conserving mechanisms.In synchrony with the hydrologic cycle, the seasonally flooded forest studied shows a nitrogencycle where inputs and accumulation are maximized when the system is under minimum stress (dry season). During flooding, the system enters a period of dormancy making minimal use of nutrient and energy to avoid or tolerate anaerobiosis.

Soil aminopeptidase induction is unaffected by inorganic nitrogen availability

2020 ◽  
Vol 149 ◽  
pp. 107952
Author(s):  
J.S. Norman ◽  
D.N. Smercina ◽  
J.T. Hileman ◽  
L.K. Tiemann ◽  
M.L. Friesen
Keyword(s):  
Nitrogen Availability ◽  
Inorganic Nitrogen

scholarly journals Nitrogen Availability in Biochar-Amended Soils with Excessive Compost Application

Agronomy ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 444 ◽  
Author(s):  
Chen-Chi Tsai ◽  
Yu-Fang Chang
Keyword(s):  
N Mineralization ◽  
Nitrogen Availability ◽  
Agricultural Soils ◽  
Inorganic Nitrogen ◽  
Clay Content ◽  
N Availability ◽  
Net N Mineralization ◽  
Mineral N ◽  
Mineralization Potential ◽  
The Impact

Adding biochar to excessive compost amendments may affect compost mineralization rate and nitrogen (N) availability. The objective of this 371-day incubation study was to evaluate the effects of four proportions of woody biochar (0%, 0.5%, 1.0%, and 2.0%) from lead tree (Leucaena leucocephala (Lam.) de. Wit) biochar produced at 750 °C through dynamic mineral N and N mineralization rates in three rural soils (one Oxisol and two Inceptisols). In each treatment, 5% poultry–livestock manure compost was added to serve as an excessive application. The results indicated that the biochar decreased available total inorganic nitrogen (TIN) (NO3−-N+NH4+-N) by on average 6%, 9% and 19% for 0.5%, 1.0% and 2.0% treatments, respectively. The soil type strongly influenced the impact of the biochar addition on the soil nitrogen mineralization potential, especially the soil pH and clay content. This study showed that the co-application of biochar and excessive compost benefited the agricultural soils by improving NO3−-N retention in agroecosystems. The application of biochar to these soils to combine it with excessive compost appeared to be an effective method of utilizing these soil amendments, as it diminished the net N mineralization potential and reduced the nitrate loss of the excessive added compost.

Mass loss and nitrogen dynamics of decaying litter of grasslands: the apparent low nitrogen immobilization potential of root detritus

1992 ◽  
Vol 70 (2) ◽  
pp. 384-391 ◽  
Author(s):  
T. R. Seastedt ◽  
W. J. Parton ◽  
D. S. Ojima
Keyword(s):  
Mass Loss ◽  
Nitrogen Availability ◽  
Inorganic Nitrogen ◽  
Nitrogen Concentration ◽  
C:N Ratio ◽  
Nitrogen Dynamics ◽  
Nitrogen Immobilization ◽  
Litter Bag ◽  
Root Litter ◽  
Low Nitrogen

Litter-bag studies and simulation modeling were used to examine the relationship between mass loss and nitrogen content of decaying prairie foliage and root litter. In contrast with forest studies, grassland roots were low in lignin and nitrogen, decayed more rapidly than foliage, and demonstrated very low nitrogen immobilization potentials. Our findings agree with reports indicating that buried substrates with high C:N ratios do not immobilize substantial amounts of nitrogen and that nitrogen-limited environments induce steeper slopes in the mass loss – nitrogen concentration relationship. However, results suggesting rapid nitrogen mineralization contradict our own studies demonstrating reduced inorganic nitrogen availability in soils of frequently burned prairie. Simulation of observed patterns using the CENTURY grassland model indicated that these results could not occur without creating soil organic matter with unrealistically high C:N ratios. Litter-bag studies of buried substrates therefore may provide an incomplete perspective on the mass loss and nitrogen dynamics of buried litter in grassland and agroecosystem soils. Key words: Andropogon gerardii, C:N ratio, decomposition, immobilization, mineralization, nitrogen.

scholarly journals Plant controls on post-fire nitrogen availability in a pine savanna

2016 ◽  
Author(s):  
Cari D. Ficken ◽  
Justin P. Wright
Keyword(s):  
Nitrogen Availability ◽  
Inorganic Nitrogen ◽  
Management Tool ◽  
Sink Strength ◽  
N Availability ◽  
Ash Deposition ◽  
Soil N ◽  
Eastern United States ◽  
Soil N Availability ◽  
Pine Savanna

Abstract. Many ecosystems experience drastic changes to soil nutrient availability associated with fire, but the magnitude and duration of these changes are highly variable among vegetation and fire types. In pyrogenic pine savannas across the south eastern United States, pulses of soil inorganic nitrogen (N) occur in tandem with ecosystem-scale nutrient losses from prescribed burns. Despite the importance of this management tool for restoring and maintaining fire-dependent plant communities, the contributions of different mechanisms underlying fire-associated changes to soil N availability remain unclear. Pulses of N availability following fire have been hypothesized to occur through (1) changes to microbial cycling rates and (2) direct ash deposition; we further hypothesize that (3) changes to plant sink strength may contribute to ephemeral increases in soil N availability. Here, we document fire-associated changes to N availability across the growing season in a longleaf pine savanna in North Carolina. To differentiate between possible mechanisms driving soil N pulses, we measured net microbial cycling rates and changes to soil δ15N before and after a burn. We found no evidence for changes in microbial activity, and limited evidence that ash deposition could account for the increase in ammonium availability to more than 5–25 times background levels. We conclude that a temporary dampening of vegetation demand for N following fire may contribute to the observed increases in inorganic N availability.

Internal nitrogen dynamics in stormwater pond sediments are influenced by pond age and inorganic nitrogen availability

2021 ◽  
Vol 156 (2) ◽  
pp. 255-278
Author(s):  
Steven P. Hohman ◽  
Ashley R. Smyth ◽  
Eban Z. Bean ◽  
Alexander J. Reisinger
Keyword(s):  
Nitrogen Availability ◽  
Inorganic Nitrogen ◽  
Nitrogen Dynamics ◽  
Stormwater Pond ◽  
Pond Sediments

scholarly journals Green manure effects on inorganic nitrogen dynamics in soil and its accumulation in grape must

2019 ◽  
Vol 13 ◽  
pp. 04010
Author(s):  
Roberto Zanzotti ◽  
Enzo Mescalchin
Keyword(s):  
Soil Nitrogen ◽  
Green Manure ◽  
Nitrogen Availability ◽  
Fruit Set ◽  
Inorganic Nitrogen ◽  
Mineral Fertilizer ◽  
Climatic Trend ◽  
Yeast Assimilable Nitrogen ◽  
Assimilable Nitrogen ◽  
Phenological Phases

The adoption of green manure practices in organic agriculture is increasingly spreading. This work aims to prove whether winter green manure—when compared to a traditional mineral fertilizer— alters the dynamics of inorganic nitrogen (NO3− and NH4+) availability in soil and the yeast assimilable nitrogen (YAN) in grape musts. During a two-year period, the soil nitrogen content was influenced by climatic trend and, especially, by rainfall. In fact, rainy periods reduced inorganic nitrogen availability in the soil. In both years, the green manure plot presented higher soil content of inorganic nitrogen at fruit-set, while different dynamics were shown over the following phenological phases. The must YAN concentration did not differ among treatments over the two-year experiment.

Microbial Succession and Nitrogen Cycling in Cultured Biofilms as Affected by the Inorganic Nitrogen Availability

2016 ◽  
Vol 73 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Shuangshuang Li ◽  
Chengrong Peng ◽  
Chun Wang ◽  
Jiaoli Zheng ◽  
Yao Hu ◽  
...  
Keyword(s):  
Nitrogen Cycling ◽  
Nitrogen Availability ◽  
Inorganic Nitrogen ◽  
Microbial Succession
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