Estimation of Gross Nitrogen Transformations and Nitrogen Retention in Grassland Soils Using FLUAZ

Accoe, Frederik; Boeckx, Pascal; Videla, Ximena; Pino, Inés; Hofman, Georges; Cleemput, Oswald Van

doi:10.2136/sssaj2004.0282

Cited by 18 publications

(11 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the four soils studied, the gross NH 4 + immobilization rates in the first day after addition of the NH 4 NO 3 solution were considerably higher than those in the rest of the incubation, consistent with the result of Accoe et al (2005). The large amount of NH 4 + -N added to the soil might have stimulated NH 4 + immobilization.…”

Section: Discussionsupporting

confidence: 80%

Land-use type and temperature affect gross nitrogen transformation rates in Chinese and Canadian soils

et al. 2010

View full text Add to dashboard Cite

Land-use type affects gross nitrogen transformation and this information is particularly lacking under varied low temperature conditions. In this study, the effects of land-use type (forest vs. grassland) and temperature (10 vs. 15°C) on gross N transformation rates under aerobic conditions were investigated using the 15 N isotope pool dilution technique in the laboratory. Soils were collected from forest and grassland sites in China and Canada. The results showed that gross N mineralization and immobilization rates were significantly higher in forest soils than in grassland soils, while the reverse was true for gross nitrification rates. The higher TC and lower SOCw concentrations in the Chinese soils relative to the Canadian soils were related to the greater gross N mineralization rates and lower gross N immobilization rates in Chinese soils. The greater gross N mineralization rates and lower gross N immobilization rates resulted in much higher inorganic N accumulation and that may increase the risk of NO 3 − leaching in the Chinese soils. Increasing temperature significantly increased gross nitrification rates in grassland soils and gross N immobilization rates in forest soils, suggesting that grassland soils maybe more vulnerable to N loss through NO 3 − leaching or denitrification (when conditions for denitrification exist) and that conversion of grassland to forest soils may exert less negative effects on the environment by promoting the retention of N and decreasing the production of NO 3 − and subsequently the risk of NO 3 − leaching under increasing temperature by global warming.

show abstract

Section: Discussionsupporting

confidence: 80%

Land-use type and temperature affect gross nitrogen transformation rates in Chinese and Canadian soils

et al. 2010

View full text Add to dashboard Cite

show abstract

“…This is confirmed by the finding that also for the forest floor SOC content as well as C/N ratio are higher at the warm-dry SW site as compared to the other sites characterized by cool-moist microclimate (Dannenmann et al 2006). Accoe et al (2004) reported ratios of gross N immobilization to gross N mineralization in grassland soils to increase with increasing C availability and Accoe et al (2005) related differences in the relative N retention across three grassland soils to different soil C content. Both studies concluded that potential N retention in soils through microbial N immobilization tends to be limited by C availability.…”

Section: Thinning Effects On Microbial Biomasssupporting

confidence: 65%

Effects of forest management on soil N cycling in beech forests stocking on calcareous soils

Dannenmann¹,

Gasché²,

Ledebuhr³

et al. 2006

Plant Soil

106

114

View full text Add to dashboard Cite

The effects of forest management (thinning) on gross and net N conversion, the balance of inorganic N production and consumption, inorganic N concentrations and on soil microbial biomass in the Ah layer were studied in situ during eight intensive field measuring campaigns in the years 2002-2004 at three beech (Fagus sylvatica L.) forest sites. At all sites adjacent thinning plots (''T'') and untreated control plots (''C'') were established. Since the sites are characterized either by cool-moist microclimate (NE site and NW site) or by warm-dry microclimate (SW site) and thinning took place in the year 1999 at the NE and SW sites and in the year 2003 at the NW site the experimental design allowed to evaluate (1) short-term effects (years 1-2) of thinning at the NW site and (2) medium-term effects (years 4-6) of thinning under different microclimate at the SW and NE site. Microbial biomass N was consistently higher at the thinning plots of all sites during most of the field campaigns and was overall significantly higher at the SWT and NWT plots as compared to the corresponding untreated control plots. The size of the microbial biomass N pool was found to correlate positively with both gross ammonification and gross nitrification as well as with extractable soil NO 3 -concentrations. At the SW site neither gross ammonification, gross nitrification, gross ammonium (NH 4 + ) immobilization and gross nitrate (NO 3 -) immobilization nor net ammonification, net nitrification and extractable NH 4 + and NO 3 -contents were significantly different between control and thinning plot. At the NET plot lower gross ammonification and gross NH 4 + immobilization in conjunction with constant nitrification rates coincided with higher net nitrification and significantly higher extractable NO 3 -concentrations. Thus, the medium-term effects of thinning varied with different microclimate. The most striking thinning effects were found at the newly thinned NW site, where gross ammonification and gross NH 4 + immobilization were dramatically higher immediately after thinning. However, they subsequently tended to decrease in favor of gross nitrification, which was significantly higher at the NWT plot as compared to the NWC plot during all field campaigns after thinning except for April 2004. This increase in gross nitrification at the NWT plot (1.73 mg N kg -1 sdw day -1 versus 0.48 mg N kg -1 sdw day -1 at the NWC plot) coincided with significantly higher extractable NO 3 -concentrations (4.59 mg N kg -1 sdw at the NWT plot versus Ó Springer Science+Business Media B.V. 2006 0.96 mg N kg -1 sdw at the NWC plot). Pronounced differences in relative N retention (the ratio of gross NH 4 + immobilization + gross NO 3 -immobilization to gross ammonification + gross nitrification) were found across the six research plots investigated and could be positively correlated to the soil C/N ratio (R = 0.94; p = 0.005).In sum, the results obtained in this study show that (1) thinning can lead to a shift in the balance of microbial inorganic N production ...

show abstract

“…1c) may restrict heterotrophic NO 3 − utilization (Booth et al 2005;Dannenmann et al 2006). Second, it may alter the competitive balance of microbial NH 4 + utilization in favor of autotrophic nitrification and at the expense of heterotrophic microorganisms performing N immobilization (Accoe et al 2004(Accoe et al , 2005Booth et al 2005;Dannenmann et al 2006). This indirect effect of C availability on autotrophic nitrification could have been supported by the low NH 4 + concentrations found in this study.…”

Section: Grazing Effects On Soil and Plant Parametersmentioning

confidence: 99%

Feedback of grazing on gross rates of N mineralization and inorganic N partitioning in steppe soils of Inner Mongolia

Dannenmann

Fanselow

et al. 2010

Plant Soil

View full text Add to dashboard Cite

Plant-microbe interactions are crucial regulators of belowground nitrogen cycling in terrestrial ecosystems. However, such interactions have mostly been excluded from experimental setups for the investigation of gross inorganic N fluxes and N partitioning to plants and microorganisms. Ungulate grazing is likely to feed back on soil N fluxes, and hence it is of special importance to simultaneously investigate grazing effects on both plant and microbial N fluxes in intact plant-soil systems, where plant-microbe interactions persist during the experimental incubation. Based on the homogenous 15 NH 4 + labelling of intact plant-soil monoliths we investigated how various stocking rates (0, 2.35, 4.8 and 7.85 sheep ha −1 grazing season −1 ) in steppe of Inner Mongolia feedback on gross rates of N mineralization and short-term inorganic N partitioning between plant, microbial and soil N pools. Our results showed that the effect of grazing on gross N mineralization was non-uniform. At low stocking rate gross N mineralization tended to decrease but increased with higher grazing pressure. Hence, there was no significant correlation between stocking rate and gross N mineralization across the investigated grazing intensities. Grazing decreased 15 N recovery both in plant and microbial N pools but strongly promoted NO 3 − accumulation in the soil and thus negatively affected potential ecosystem N retention. This appeared to be closely related to the grazinginduced decline in easily degradable soil C availability at increasing stocking rate.

show abstract

Estimation of Gross Nitrogen Transformations and Nitrogen Retention in Grassland Soils Using FLUAZ

Cited by 18 publications

References 31 publications

Land-use type and temperature affect gross nitrogen transformation rates in Chinese and Canadian soils

Land-use type and temperature affect gross nitrogen transformation rates in Chinese and Canadian soils

Effects of forest management on soil N cycling in beech forests stocking on calcareous soils

Feedback of grazing on gross rates of N mineralization and inorganic N partitioning in steppe soils of Inner Mongolia

Contact Info

Product

Resources

About