Deposition and Decomposition of Signal Grass Pasture Litter under Varying Nitrogen Fertilizer and Stocking Rates

Apolinário, Valéria X. O.; Dubeux, José C. B.; Mello, Alexandre Carneiro Leão de; Vendramini, J. M. B.; Lira, M. A.; Santos, Mércia Virgínia Ferreira dos; Muir, James P.

doi:10.2134/agronj2012.0433

Cited by 24 publications

(24 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These differences in existing litter carried over to August 2016. Apolinário et al (2013) evaluated litter dynamics of signalgrass pastures managed under different stocking rates and N fertilization rates (0, 150, and 300 kg N ha −1 yr −1 ). 3).…”

Section: Existing Litter Mass and Litter Deposition Ratementioning

confidence: 61%

“…1), and rainfall and temperature affect plant litter dynamics (Dubeux et al, 2006a(Dubeux et al, , 2006bSilva et al, 2012;Apolinário et al, 2013). Years were analyzed separately because weather conditions differed considerably (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Years were analyzed separately because weather conditions differed considerably (Fig. 1), and rainfall and temperature affect plant litter dynamics (Dubeux et al, 2006a(Dubeux et al, , 2006bSilva et al, 2012;Apolinário et al, 2013). For response variables analyzed with the single exponential decay model, k (relative decay rate) was compared.…”

Section: Resultsmentioning

confidence: 99%

“…Litter deposition rate was calculated by dividing the collected litter mass (14 d after clearing the existing litter) by 14 and adjusting for decomposition that occurred during the 14-d period (Rezende et al, 1999;Dubeux et al, 2006b;Liu et al, 2011a;Apolinário et al, 2013). This procedure occurred twice each year.…”

Section: Grazing Managementmentioning

confidence: 99%

“…After an initial drying procedure and prior to weighing, both existing litter and deposited litter were sieved consecutively through 4and 2-mm sieves to remove soil, transferred to a paper bag, dried at 60°C for an additional 12 h, and weighed. Litter deposition rate was calculated by dividing the collected litter mass (14 d after clearing the existing litter) by 14 and adjusting for decomposition that occurred during the 14-d period (Rezende et al, 1999;Dubeux et al, 2006b;Liu et al, 2011a;Apolinário et al, 2013).…”

Section: Grazing Managementmentioning

confidence: 99%

See 4 more Smart Citations

Nitrogen Fertilization and Proportion of Legume Affect Litter Decomposition and Nutrient Return in Grass Pastures

et al. 2018

View full text Add to dashboard Cite

Warm‐climate grasslands are often N limited. Legume litter decomposition can contribute significantly to N input in grazing systems, but its contribution depends on litter deposition, decomposition, and chemical composition. We evaluated these responses for 2 yr in unfertilized (BG) and fertilized (BGN; 50 kg N ha−1) bahiagrass (Paspalum notatum Flügge) monocultures and in mixed swards of bahiagrass plus the legume rhizoma peanut (Arachis glabrata Benth.). Legume–grass mixture litter had greater initial N concentration (26 g N kg−1 organic matter [OM]) and lower C/N ratio (22) than BG and BGN, which did not differ from each other (18 g N kg−1 OM, C/N ratio of 31). Litter biomass relative decay rate was greater for mixtures than for bahiagrass monocultures. As a result, less biomass and N remained at the end of incubation in mixtures (62 and 76%, respectively) than in monocultures (69 and 80%, respectively). Litter deposition rate was similar across treatments, but faster decomposition and greater N concentration for legume–grass mixtures resulted in larger litter N release than in monocultures (44 and 26 kg ha−1, respectively). At the end of incubation, remaining litter biomass and remaining N decreased with increasing litter legume proportion, whereas litter N concentration and litter decay rate increased. Results indicate that legume–grass mixtures are an alternative to N fertilizer for increasing N cycling through plant litter in grasslands, and although litter deposition rates were similar across treatments, increasing legume proportion in mixtures is likely to be associated with greater litter N release.

show abstract

Section: Existing Litter Mass and Litter Deposition Ratementioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Grazing Managementmentioning

confidence: 99%

Section: Grazing Managementmentioning

confidence: 99%

See 3 more Smart Citations

Nitrogen Fertilization and Proportion of Legume Affect Litter Decomposition and Nutrient Return in Grass Pastures

et al. 2018

View full text Add to dashboard Cite

show abstract

Intensification enhances litter carbon and nitrogen decomposition dynamics in subtropical grazinglands

Kohmann

Sanchez

Silveira

et al. 2020

Agrosystems Geosci & Env

View full text Add to dashboard Cite

Increased grazing land management intensification through the selection of productive species and the use of N affects the amount and quality of C and N inputs to the soil. This study evaluated the short-term impacts of litter quality on litter decomposition and C and N distribution among soil size-density fractions. A 168-d litter bag mesocosm experiment and a 120-d incubation study evaluated the decomposition of three perennial species [rhizoma peanut (Arachis glabrata Benth., RP), bahiagrass (Paspalum notatum Flügge; BG), and sawpalmetto (Serenoa repens Bartr., SP)] on grazing land soils with contrasting C concentrations (3.4 and 18 g C kg −1 ; Buck Island Ranch and Ona, respectively). Soil did not affect litter decomposition. There was less remaining biomass at the end of incubation for RP and BG (58%) than SP (79%). Nitrogen immobilization occurred on SP litter, probably because of its high initial lignin/N and fiberbound N/N ratios (43 and 384 g kg −1 organic matter, respectively). Litter had no effect on soil C and N concentrations in size-density fractions; however, greater proportions of C and N (∼47 and 59%, respectively) were found in the light-free fraction. Nitrogen addition promoted C and N accumulation in the mineral fraction. These results suggest plant litter chemical characteristics played a more important role on litter decomposition than soil C and N concentrations. Management intensification through changes in plant species and N fertilization had positive effects on C and N dynamics in coarse-textured soils, with enhanced decomposability of cultivated forage species relative to native vegetation.

show abstract

Belowground biomass decomposition is driven by chemical composition in subtropical pastures and native rangelands

Kohmann

Silveira

Brandani

et al. 2020

Agrosystems Geosci & Env

View full text Add to dashboard Cite

Litter decomposition, particularly from belowground pools, is a key process controlling the flow of nutrients and the sustainability of native and cultivated grazinglands. This study evaluated in situ belowground decomposition of sawpalmetto (Serenoa repens [W. Bartram] Small) and bahiagrass (Paspalum notatum Flügge; BG), which corresponded to the predominant plant species in native and cultivated pastures in the southeastern United States. Belowground biomass decomposition (180 d) was estimated using the litterbag technique during the summer and winter. Season showed no effect on belowground decomposition. Decomposition followed a double exponential model (P ≤ .01) and was greater for BG than for native rangeland (NR) (−0.0008 and −0.0001 g g −1 d −1 , respectively; P = .0035), resulting in less remaining material at the end of incubation for BG (74% compared with 93% for NR; P ≤ .002). Greater decomposition in BG occurred due to more favorable chemical composition than NR, namely greater initial N concentration (17 and 8 g kg −1 organic matter for BG and NR, respectively) and lower initial C/N ratio (29 and 65 for BG and NR, respectively), lignin/N ratio (13 and 54 for BG and NR, respectively), and C/P ratio (407 and 1,327 for BG and NR, respectively). Despite the differences in initial C/N ratios, remaining N was similar between BG and NR at end of incubation (96 and 84%, respectively; P = .3711). Land use intensification in grazinglands, in particular conversion of native rangelands to cultivated pastures, can have major impacts on belowground decomposition and on the biogeochemical cycle of nutrients in these ecosystems.

show abstract

Deposition and Decomposition of Signal Grass Pasture Litter under Varying Nitrogen Fertilizer and Stocking Rates

Cited by 24 publications

References 19 publications

Nitrogen Fertilization and Proportion of Legume Affect Litter Decomposition and Nutrient Return in Grass Pastures

Nitrogen Fertilization and Proportion of Legume Affect Litter Decomposition and Nutrient Return in Grass Pastures

Intensification enhances litter carbon and nitrogen decomposition dynamics in subtropical grazinglands

Belowground biomass decomposition is driven by chemical composition in subtropical pastures and native rangelands

Contact Info

Product

Resources

About