Response of soil organic carbon to land-use change in central Brazil: a large-scale comparison of Ferralsols and Acrisols

Strey, Simone; Boy, Jens; Strey, Robert; Weber, Oscarlina Lúcia dos Santos; Guggenberger, Georg

doi:10.1007/s11104-016-2901-6

Cited by 23 publications

(16 citation statements)

References 55 publications

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“…In a recent meta-analysis, Fujisaki et al [24] showed that the conversion of Amazon forest to pasture (mean age of 17.6 years) may promote slight increases in SOC stocks (6.8 ± 3.1 Mg·ha −1 ) in the top layers of the soil (0-20/30 cm) [24]. Moreover, the conversion from forest to pasture increased C stocks within deeper soil layers (0-100 cm) in the Brazilian Amazon region near the BR163 road, in the Mato Grosso state [25]. A regional survey of pastures that included other Brazilian biomes, such as Cerrado, Atlantic Forest, and Pampas, [35] found that the absolute change in the SOC stocks during the conversion of native vegetation to pastures, indicated an average gain of C of 6.7 Mg·ha −1 compared to native vegetation, or relative gains of 15%.…”

Section: Land Use and Management Changes Vs Soil C And N Stocksmentioning

confidence: 99%

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Soil Organic Matter Responses to Anthropogenic Forest Disturbance and Land Use Change in the Eastern Brazilian Amazon

et al. 2017

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Anthropogenic forest disturbance and land use change (LUC) in the Amazon region is the main source of greenhouse gas emissions to the atmosphere in Brazil, due to the carbon (C) and nitrogen (N) emitted from vegetation clearance. Land use conversion associated with management practices plays a key role in the distribution and origin of C in different soil organic matter (SOM) fractions. Here, we show how changing land use systems have influenced soil C and N stocks, SOM physical fractions, and the origin of SOM in the Santarém region of the eastern Brazilian Amazon. Soil C and N stocks were calculated for the surface layer of 0-30 cm. Anthropogenic disturbances to the standing forest, such as selective logging and wildfires, led to significant declines in soil C and N stocks. However, in the long-term, the conversion of the Amazon forest to pasture did not have a noticeable effect on soil C and N stocks, presumably because of additional inputs from pasture grasses. However, the conversion to cropland did lead to reductions in soil C and N content. According to the physical fractionation of SOM, LUC altered SOM quality, but silt and clay remained the combined fraction that contributed the most to soil C storage. Our results emphasize the importance of implementing more sustainable forest management systems, whilst also calling further attention to the need for fire monitoring systems, helping to ensure the resilience of C and N stocks and sequestration in forest soils; thereby contributing towards urgently needed ongoing efforts to mitigate climate change.

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Section: Land Use and Management Changes Vs Soil C And N Stocksmentioning

confidence: 99%

“…A combination of fire and logging can severely alter the forest structure and drastically change the above-and belowground C and N stocks [22,24,25]. During the burning of a forest, a large amount of C is transferred to the atmosphere (e.g., CO 2 and CO).…”

Section: Land Use and Management Changes Vs Soil C And N Stocksmentioning

confidence: 99%

Soil Organic Matter Responses to Anthropogenic Forest Disturbance and Land Use Change in the Eastern Brazilian Amazon

et al. 2017

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“…However, some studies have found opposite results; for instance, Don et al [5], in their meta-analysis focusing on tropical soils, revealed that the decrease of SOC stocks (25%) in subsoil (below 20 cm soil depth) was higher than in the 0-20 cm layer (a decrease of 20%) when primary forest was converted to cropland. More recently, Strey et al [17] found that SOC stock losses were higher in subsoils than topsoils when forest was converted to pasture. They attributed the decline in the subsoil C stock to activation of subsoil C decomposition due to soil disturbance and fresh inputs of dead roots from cleared forest vegetation.…”

Section: Introductionmentioning

confidence: 99%

Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil

2019

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Soil capacity as a major carbon (C) sink is influenced by land use. Estimates of soil organic carbon (SOC) sequestration have mostly focused on topsoils [0–30 cm official Intergovernmental Panel on Climate Change (IPCC) soil depth]. We investigated SOC stocks and their quality as influenced by land-use changes. Soil samples were collected from five soil depths down to 100 cm of three adjacent fields each representing a different land use—forest, cassava, and rice paddy—in Northeast Thailand. Sequestration of SOC in topsoils under all land uses was higher, as indicated by SOC stocks (59.0–82.0 Mg ha−1) than subsoils (30–100 cm) (27.0–33.0 Mg ha−1). The soil profile (0–100 cm) of the forest had higher stocks of SOC and humic acid (115.0 and 6.8 Mg ha−1, respectively) than those of cultivated land uses [paddy (100.0 and 4.8 Mg ha−1, respectively) and cassava (87.0 and 2.3 Mg ha−1, respectively)], which accounted for an average 30% increase in SOC sequestration over those with only topsoil. Topsoils of the forest had higher humic acid content but narrower E4:E6 ratio [the ratio of absorbances at 465 nm (E4) and at 665 nm (E6)] of humic acids (2.8), indicating a higher degree of humification and stabilization than the cultivated soils (3.2–3.6). Subsoil C was higher quality, as indicated by the lower E4:E6 ratio of humic acids than topsoils in all land uses.

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“…In the other layers, the isotopic values decrease between -19.0‰ and -21.8‰, typical of vegetation mixed between C 3 and C 4 plants. Thus, it is possible to observe the evolution of a C 3 photosynthetic cycle vegetation to C 4 , but it still indicates that the organic matter in subsurface has remnants of the characteristics of transition from native vegetation to native pasture and of natural vegetation (Carvalho et al, 2010;Strey et al, 2016;Menezes et al, 2017).…”

Section: Natural Abundance Of 13 C and 15 Nmentioning

confidence: 99%

Isotopic variations of carbon and nitrogen and their implications on the conversion of Cerrado vegetation into pasture

Oliveira

Schiavo

Lima

et al. 2021

Rev. Bras. Ciênc. Ambient. (Online)

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Conversions of natural vegetation into pasture can, in a short time, change the carbon stock and the natural abundance of δ13C in the soil. The objective of this study was to evaluate changes in carbon (C) and nitrogen (N) stocks, as well as in the natural abundance of δ13C and δ15N of Argissolo Vermelho distrófico (Acrisol), in an area of natural vegetation and planted pasture in the Cerrado region of Aquidauana (MS), Brazil. In order to do this, an area of pasture (PA), cultivated for 25 years with Urochloa brizantha, and an area of natural vegetation (NV) were evaluated. Soil samples were collected at intervals of 0.05 m up to 0.60 m depth, and physical attributes, C and N stocks (CSt and NSt) and isotopic variations of δ13C and δ15N of soil were determined. In the 0–0.05 m layer, the highest C and N stocks occurred in NV, 21.99 and 1.9 Mg ha-1, respectively. In the conversion to PA, 14.62 Mg ha-1 of CSt and 1.36 Mg ha-1 of NSt were lost in the 0–0.05 m layer. The area with PA had greater isotopic enrichment of δ13C in the layers of 0–0.05 and 0.05–0.10 m, with values of -18.3 and -17.4‰, respectively, while in the other layers the isotopic values decreased with the mixture between C of C3 and C4 plants. NV showed enrichment in the isotopic signals, in the layers from 0.25–0.30 m up to 0.40–0.45 m, with values between -21.74 and -21.54‰, respectively, which is characteristic of mixed vegetation of C3 and C4 plants. The values of δ15 N showed isotopic enrichment as depth increased, indicating greater mineralization of soil organic matter in both areas. The conversion of Cerrado into pasture and its consequent fragmentation causes negative impacts on the C and N sequestration and storage capacity, both in pasture and in natural vegetation.

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Response of soil organic carbon to land-use change in central Brazil: a large-scale comparison of Ferralsols and Acrisols

Cited by 23 publications

References 55 publications

Soil Organic Matter Responses to Anthropogenic Forest Disturbance and Land Use Change in the Eastern Brazilian Amazon

Soil Organic Matter Responses to Anthropogenic Forest Disturbance and Land Use Change in the Eastern Brazilian Amazon

Land–Use Changes Influencing C Sequestration and Quality in Topsoil and Subsoil

Isotopic variations of carbon and nitrogen and their implications on the conversion of Cerrado vegetation into pasture

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