Impact of Grazing on Soil Nutrients in a Pampean Grassland

Lavado, Raúl S.; Sierra, Jorge O.; Hashimoto, Patricia

doi:10.2307/4002929

Cited by 94 publications

(52 citation statements)

References 24 publications

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“…In pastures, uniform organic matter inputs from forage grasses may have maintained reduced C and N variability. Relative to the litter produced by native plants, grasses would have provided a consistent quantity and quality of organic matter (Lavado et al 1996). There is evidence for the long-term damping of fine-scale variability by plant monocultures in cultivated systems (Robertson et al 1993) and by different plant growth forms and in successional forests (Gross et al 1995).…”

Section: Discussionmentioning

confidence: 99%

“…Extensive tree removal, for example, may homogenize both pastures and cut-overs at fine scales by integrating soil horizons and eliminating organic matter sources Ryan 1990, Yanai et al 2003). Nutrient heterogeneity in pastures may be further reduced by the maintenance of forage grasses, which provide spatially homogenous litter inputs (Lavado et al 1996). However, the deposition of excreta may enhance the heterogeneity of those nutrients that are abundant in manure, such as P, K, and Mg (Afzal and Adams 1992, Augustine and Frank 2001, Augustine 2003.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Past Land Use on Spatial Heterogeneity of Soil Nutrients in Southern Appalachian Forests

Fraterrigo

Turner

Pearson

et al. 2005

Ecological Monographs

215

172

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Abstract. We examined patterns of nutrient heterogeneity in the mineral soil (0-15 cm depth) of 13 southern Appalachian forest stands in western North Carolina Ͼ60 yr after abandonment from pasture or timber harvest to investigate the long-term effects of land use on the spatial distribution and supply of soil resources. We measured soil carbon (C), nitrogen (N), acid-extractable phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg) concentrations and pools, and potential net N mineralization and nitrification rates to evaluate differences in mean values, variance at multiple scales, and fine-scale spatial structure.While comparisons of averaged values rarely indicated that historical land use had an enduring effect on mineral soil or N cycling, differences in variance and spatial structure suggested that former activities continue to influence nutrient distributions by altering their spatial heterogeneity. Patterns differed by element, but generally variance of soil C, N, and Ca decreased and variance of soil P, K, and Mg increased with intensive past land use. Changes in variance were most conspicuous and consistent locally (Ͻ28 m), but C, Ca, P, and Mg also exhibited appreciable differences in variance at coarser scales (Ͼ150 m). High variability in soil compaction resulted in some changes in scale-dependent patterns of nutrient pool variance compared with nutrient concentration variance. It also affected the variance of N cycling rates, such that mass-based rates varied less and area-based rates varied more in intensively used areas than in reference stands. Geostatistical analysis suggested that past land use homogenized the spatial structure of soil C, K, and P in former pastures. In contrast, logged stands had highly variable spatial patterning for Ca.These results suggest that land use has persistent, multi-decadal effects on the spatial heterogeneity of soil resources, which may not be detectable when values are averaged across sites. By interacting with patterns of variability in the plant and heterotrophic biota, differences in nutrient distribution and supply could alter the composition and diversity of forest ecosystems. Scale-dependent changes in nutrient heterogeneity could also complicate efforts to determine biogeochemical budgets and cycling rates.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Past Land Use on Spatial Heterogeneity of Soil Nutrients in Southern Appalachian Forests

Fraterrigo

Turner

Pearson

et al. 2005

Ecological Monographs

215

172

View full text Add to dashboard Cite

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“…Soil organic C was not significantly different between the three sites. These results have been corroborated by others in SOC studies on upland and sandy rangelands (Lavado et al, 1996;Berg et al, 1997).…”

Section: No Change In Soc Levelssupporting

confidence: 85%

“…Studies of grazing have found different SOC responses, including increases in SOC (Reeder and Schuman, 2002;Bilotta et al, 2007;Derner and Schuman, 2007;Franzluebbers and Stuedemann, 2010), decreases in SOC (Frank, et al, 1995), and no changes in SOC (Dormaar et al, 1977;Milchunas and Lauenroth, 1993;Lavado et al, 1996;Berg et al, 1997;Renzhong and Ripley, 1997;Schuman et al, 1999;Raiesi and Asadi, 2006). Finally, conflicting results within and across reviews of studies further reveal the complex relationship between SOC and grazing (Derner et al, 1997;Guodong et al, 2008;Ingram et al, 2008;Piñeiro et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Effects of High-Density, Short-Duration Planned Livestock Grazing on Soil Carbon Sequestration Potentials in a Coastal California Mixed Grassland

Wolf¹,

Horney²,

Hallock³

et al.

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“…Previous studies have shown that different types of vegetation and soil nutrient pools exhibit significantly different responses to variations in the grazing intensity (Lavado et al, 1996;Ingrisch et al, 2015). However, there is still a lack of robust studies to evaluate the combined effect of grazing and climate change, as well as their impact on the QTP grassland ecosystem on a large scale.…”

mentioning

confidence: 99%

Modeling impacts of climate change and grazing effects on plant biomass and soil organic carbon in the Qinghai–Tibetan grasslands

Zhang

et al. 2017

Biogeosciences

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Abstract. The Qinghai Province supports over 40 % of the human population of the Qinghai-Tibetan Plateau (QTP) but occupies about 29 % of its land area, and thus it plays an important role in the plateau. The dominant land cover is grassland, which has been severely degraded over the last decade due to a combination of increased human activities and climate change. Numerous studies indicate that the plateau is sensitive to recent global climate change, but the drivers and consequences of grassland ecosystem change are controversial, especially the effects of climate change and grazing patterns on the grassland biomass and soil organic carbon (SOC) storage in this region. In this study, we used the DeNitrification-DeComposition (DNDC) model and two climate change scenarios (representative concentration pathways: RCP4.5 and RCP8.5) to understand how the grassland biomass and SOC pools might respond to different grazing intensities under future climate change scenarios. More than 1400 grassland biomass sampling points and 46 SOC points were used to validate the simulated results. The simulated above-ground biomass and SOC concentrations were in good agreement with the measured data (R 2 0.71 and 0.73 for above-ground biomass and SOC, respectively). The results showed that climate change may be the major factor that leads to fluctuations in the grassland biomass and SOC, and it explained 26.4 and 47.7 % of biomass and SOC variation, respectively. Meanwhile, the grazing intensity explained 6.4 and 2.3 % variation in biomass and SOC, respectively. The project average biomass and SOC between 2015 and 2044 was significantly smaller than past 30 years , and it was 191.17 g C m −2 , 63.44 g C kg −1 and 183.62 g C m −2 , 63.37 g C kg −1 for biomass and SOC under RCP4.5 and RCP8.5, respectively. The RCP8.5 showed the more negative effect on the biomass and SOC compared with RCP4.5. Grazing intensity had a negative relationship with biomass and positive relationship with SOC. Compared with the baseline, the biomass and SOC changed by 12.56 and −0.19 % for G 0 , 7.23 and 0.23 for G −50 , and −5.17 and 1.19 % for G +50 . In the future, more human activity and management practices should be coupled into the model simulation.

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Impact of Grazing on Soil Nutrients in a Pampean Grassland

Cited by 94 publications

References 24 publications

Effects of Past Land Use on Spatial Heterogeneity of Soil Nutrients in Southern Appalachian Forests

Effects of Past Land Use on Spatial Heterogeneity of Soil Nutrients in Southern Appalachian Forests

Effects of High-Density, Short-Duration Planned Livestock Grazing on Soil Carbon Sequestration Potentials in a Coastal California Mixed Grassland

Modeling impacts of climate change and grazing effects on plant biomass and soil organic carbon in the Qinghai–Tibetan grasslands

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