Influence of cattle grazing on nitrogen cycling in soils beneath Stipa tenuis, native to central Argentina

Andrioli, Romina Jessica; Distel, Roberto Alejandro; Didone, Nilda Graciela

doi:10.1016/j.jaridenv.2009.09.010

Cited by 10 publications

(7 citation statements)

References 32 publications

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“…Soil NH 4 + -N concentration was not significantly different for different grazing intensities in our study, or in the findings reported by Shan et al (2011). Previous studies demonstrated that net ammonification and gross N mineralization were not affected by grazing intensities during grazing seasons in central Argentina (Andrioli et al, 2010) and Inner Mongolia (Wu et al, 2011). It was reported that soil NO 3 --N concentration increased with increasing grazing intensity and that at the highest grazing intensity, soil NO 3 --N concentration was 10 times that of soil NH 4 + -N (Wu, 2011).…”

Section: Effects Of Grazing On Soil Nh 3 Emissionssupporting

confidence: 53%

Ammonia emissions from soil under sheep grazing in inner mongolian grasslands of China

Zhang

et al. 2013

J. Arid Land

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Ammonia (NH 3) emission and redeposition play a major role in terrestrial nitrogen (N) cycles and can also cause environmental problems, such as changes in biodiversity, soil acidity, and eutrophication. Previous field grazing experiments showed inconsistent (positive, neutral, and negative) NH 3 volatilization from soils in response to varying grazing intensities. However, it remains unclear whether, or to what extent, NH 3 emissions from soil are affected by increasing grazing intensities in Inner Mongolian grasslands. Using a 5-year grazing experiment, we investigated the relationship between NH 3 volatilization from soil and grazing pressure (0.0, 3.0, 6.0, and 9.0 sheep/hm 2) from June to September of 2009 and 2010 via the vented-chamber method. The results show that soil NH 3 volatilization was not significantly different at different grazing intensities in 2009, although it was higher at the highest stocking rate during 2010. There was no significant linear relationship between soil NH 3 volatilization rates and soil NH 4 +-N, but soil NH 3 volatilization rates were significantly related to soil water content and air temperature. Grazing intensities had no significant influence on soil NH 3 volatilization. Soil NH 3 emissions from June to September (grazing period), averaged over all grazing intensities, were 9.6±0.2 and 19.0±0.2 kg N/hm 2 in 2009 and 2010, respectively. Moreover, linear equations describing monthly air temperature and precipitation showed a good fit to changes in soil NH 3 emissions (r=0.506, P=0.014). Overall, grazing intensities had less influence than that of climatic factors on soil NH 3 emissions. Our findings provide new insights into the effects of grazing on NH 3 volatilization from soil in Inner Mongolian grasslands, and have important implications for understanding N cycles in grassland ecosystems and for estimating soil NH 3 emissions on a regional scale.

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Section: Effects Of Grazing On Soil Nh 3 Emissionssupporting

confidence: 53%

Ammonia emissions from soil under sheep grazing in inner mongolian grasslands of China

Zhang

et al. 2013

J. Arid Land

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“…Regarding outputs, grazers promote higher N losses from urine and dung patches but can also stimulate N retention by decreasing N losses through greater root allocation. Regarding inputs, grazing can decrease N inputs by decreasing legume biomass or cover but can also increase N redeposition from the atmosphere, partially compensating for N losses (Andrioli et al, 2010;Piñeiro et al, 2010). Significant differences were observed in soil TN concentrations between the GE plots and FG plots in the 0-15 cm soil layer, indicating that the N nutrients in the soil surface layer were reduced due to grazing exclusion (Fig.…”

Section: Effect Of Grazing Exclusion On Soil Nutrientsmentioning

confidence: 99%

Short-term grazing exclusion has no impact on soil properties and nutrients of degraded alpine grassland in Tibet, China

et al. 2015

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Abstract. Since the 1980s, alpine grasslands have been seriously degraded on the Tibetan Plateau. Grazing exclusion by fencing has been widely adopted to restore degraded grasslands. To clarify the effect of grazing exclusion on soil quality, we investigated soil properties and nutrients by comparing free-grazing (FG) and grazing exclusion (GE) grasslands in Tibet. Soil properties -including soil bulk density, pH, particle size distributions, and proportion of aggregatesshowed no significant difference between FG and GE plots.

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“…Grazing has been reported to promote soil mineralization in some grassland ecosystems, partly as a result of dung and urine deposition (Barger et al 2004;Xu et al 2007;Tracy and Frank 1998). The positive direct effect of herbivore on nitrogen cycling is based upon assumptions of reductions in belowground carbon input, increases in the quality of soil organic matter and deposition of high-nitrogen products (Andrioli et al 2010;Knops et al 2002). Livestock only use a small proportion of the nutrients they ingest, and 60-95% of ingested nutrients are returned to the pasture in the form of dung and urine (Haynes and Williams 1999).…”

Section: Effects Of Grazing On Soil Nitrogen Mineralization Ratementioning

confidence: 99%

Grazing intensity effects on soil nitrogen mineralization in semi-arid grassland on the Loess Plateau of northern China

Liu

Zhang

Hou

2011

Nutr Cycl Agroecosyst

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Soil nitrogen transformation has been the subject of growing attention in many semi-arid grassland ecosystems. In our study, we employed an intact soil core in situ incubation technique and measured seasonal changes in soil net nitrogen mineralization and nitrification rates. The measurements were taken from the upper 0-10 cm soil layer of a permanent grassland during a growing season in a 8.5-year field experiment on the Loess Plateau, China that had four grazing intensities (0, 2.7, 5.3 and 8.7 sheep ha -1 ). Our results demonstrate marked seasonal variations in inorganic nitrogen pools, net nitrogen mineralization and net nitrification. The rates of mineralization and nitrification were highest in August and lowest in September. No consistent differences in monthly net nitrogen mineralization and monthly nitrification rates were observed among the different grazing intensities. Sheep grazing stimulated nitrogen transformation, and the most stimulation occurred at a heavy grazing intensity of 8.7 sheep ha -1 . The mean soil net nitrification rate was positively correlated with the soil C/N ratio and pH. The mean N mineralization rate was negatively correlated with soil organic carbon, but was positively correlated with the soil C/N ratio. Our study demonstrated net nitrogen mineralization and nitrification rates were strongly linked to grazing intensity, soil temperature and moisture content.

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Influence of cattle grazing on nitrogen cycling in soils beneath Stipa tenuis, native to central Argentina

Cited by 10 publications

References 32 publications

Ammonia emissions from soil under sheep grazing in inner mongolian grasslands of China

Ammonia emissions from soil under sheep grazing in inner mongolian grasslands of China

Short-term grazing exclusion has no impact on soil properties and nutrients of degraded alpine grassland in Tibet, China

Grazing intensity effects on soil nitrogen mineralization in semi-arid grassland on the Loess Plateau of northern China

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