Soil carbon and nitrogen stocks in traditional agricultural and agroforestry systems in the semiarid region of Brazil

Sacramento, José Augusto Amorim Silva do; Araújo, Ana Caroline de Moraes; Escobar, Maria Eugenia Ortiz; Xavier, F. A. da S.; Cavalcante, Ana Clara Rodrigues; Oliveira, Teógenes Senna de

doi:10.1590/s0100-06832013000300025

Cited by 38 publications

(27 citation statements)

References 33 publications

(43 reference statements)

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“…It seems that this is a common pattern observed for different crops and different types of land management in several regions of Brazil, like in the northeast (Lima et al, 2011;Fracetto et al, 2012;Barros et al, 2013;Sacramento et al, 2013), in central Brazil (Cardoso et al, 2010;Silva et al, 2011;Guareschi et al, 2012) and in the south (Sisti et al, 2004;Sá et al, 2013;Santana et al, Figure 5. Scatter plot of soil carbon stock losses (data from Assad et al, 2013), and soil nitrogen stock losses found in our study between pasture and native vegetation in the paired study sites (a) 0-10 cm, (b) 0-30 cm and (c) 0-60 cm depth intervals.…”

Section: Land-use Changes Alter Nitrogen and Phosphorus Stocksmentioning

confidence: 74%

“…On the other hand, there are few regional studies considering how nitrogen and phosphorus soil contents will be affected in these integrated agricultural systems. Plot-level studies have reported a decrease in soil nitrogen stocks with cultivation in several N-fertilized areas of Brazil and under different cropping systems (Lima et al, 2011;Fracetto et al, 2012;Barros et al, 2013;Sacramento et al, 2013;Cardoso et al, 2010;Silva et al, 2011;Guareschi et al, 2012;Sisti et al, 2004;Santana et al, 2013;Sá et al, 2013). The same trend has been observed in Chernozem soils in Russia and in prairie soils of Wisconsin in the USA (Mikhailova et al, 2000;Kucharik et al, 2001).…”

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confidence: 99%

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Changes in soil carbon, nitrogen, and phosphorus due to land-use changes in Brazil

Groppo

Lins²,

Camargo³

et al. 2015

Biogeosciences

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Abstract. In this paper, soil carbon, nitrogen and phosphorus concentrations and stocks were investigated in agricultural and natural areas in 17 plot-level paired sites and in a regional survey encompassing more than 100 pasture soils In the paired sites, elemental soil concentrations and stocks were determined in native vegetation (forests and savannas), pastures and crop-livestock systems (CPSs). Nutrient stocks were calculated for the soil depth intervals 0-10, 0-30, and 0-60 cm for the paired sites and 0-10, and 0-30 cm for the pasture regional survey by sum stocks obtained in each sampling intervals (0-5, 5-10, 10-20, 20-30, 30-40, 40-60 cm). Overall, there were significant differences in soil element concentrations and ratios between different land uses, especially in the surface soil layers. Carbon and nitrogen contents were lower, while phosphorus contents were higher in the pasture and CPS soils than in native vegetation soils. Additionally, soil stoichiometry has changed with changes in land use. The soil C : N ratio was lower in the native vegetation than in the pasture and CPS soils, and the carbon and nitrogen to available phosphorus ratio (P ME ) decreased from the native vegetation to the pasture to the CPS soils. In the plotlevel paired sites, the soil nitrogen stocks were lower in all depth intervals in pasture and in the CPS soils when compared with the native vegetation soils. On the other hand, the soil phosphorus stocks were higher in all depth intervals in agricultural soils when compared with the native vegetation soils. For the regional pasture survey, soil nitrogen and phosphorus stocks were lower in all soil intervals in pasture soils than in native vegetation soils. The nitrogen loss with cultivation observed here is in line with other studies and it seems to be a combination of decreasing organic matter inputs, in cases where crops replaced native forests, with an increase in soil organic matter decomposition that leads to a decrease in the long run. The main cause of the increase in soil phosphorus stocks in the CPS and pastures of the plot-level paired site seems to be linked to phosphorus fertilization by mineral and organics fertilizers. The findings of this paper illustrate that land-use changes that are currently common in Brazil alter soil concentrations, stocks and elemental ratios of carbon, nitrogen and phosphorus. These changes could have an impact on the subsequent vegetation, decreasing soil carbon and increasing nitrogen limitation but alleviating soil phosphorus deficiency.

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Section: Land-use Changes Alter Nitrogen and Phosphorus Stocksmentioning

confidence: 74%

mentioning

confidence: 99%

Changes in soil carbon, nitrogen, and phosphorus due to land-use changes in Brazil

Groppo

Lins²,

Camargo³

et al. 2015

Biogeosciences

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show abstract

“…In most of the plot-level paired sites and in most of the regional soil survey, we found a loss of nitrogen compared to the native vegetation. It seems that this is a common pattern observed for different crops and different types of land management in several regions of Brazil, like in the northeast (Lima et al, 2011;Fracetto et al, 2012;Barros et al, 2013;Sacramento et al, 2013), in central Brazil (Cardoso et al, 2010;Silva et al, 2011;Guareschi et al, 2012) and in the south (Sisti et al, 2004;Sá et al, 2013;Santana et al, Figure 5. Scatter plot of soil carbon stock losses (data from Assad et al, 2013), and soil nitrogen stock losses found in our study between pasture and native vegetation in the paired study sites (a) 0-10 cm, (b) 0-30 cm and (c) 0-60 cm depth intervals.…”

Section: Land-use Changes Alter Nitrogen and Phosphorus Stocksmentioning

confidence: 74%

Changes in soil carbon, nitrogen and phosphorus due to land-use changes in Brazil

Groppo¹,

Lins²,

Camargo³

et al. 2015

Preprint

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Abstract. In this paper soil carbon, nitrogen and phosphorus concentrations and related elemental ratios, as well as and nitrogen and phosphorus stocks were investigated in 17 paired sites and in a regional survey encompassing more than 100 pasture soils in the Cerrado, Atlantic Forest, and Pampa, the three important biomes of Brazil. In the paired sites, elemental soil concentrations and stocks were determined in native vegetation, pastures and crop-livestock systems (CPS). Overall, there were significant differences in soil element concentrations and ratios between different land uses, especially in the surface soil layers. Carbon and nitrogen contents were lower, while phosphorus contents were higher in the pasture and CPS soils than in forest soils. Additionally, soil stoichiometry has changed with changes in land use. The soil C : N ratio was lower in the forest than in the pasture and CPS soils; and the carbon and nitrogen to available phosphorus ratio (PME) decreased from the forest to the pasture to the CPS soils. The average native vegetation soil nitrogen stocks at 0–10, 0–30 and 0–60 cm soil depth layers were equal to approximately 2.3, 5.2, 7.3 Mg ha−1, respectively. In the paired sites, nitrogen loss in the CPS systems and pasture soils were similar and equal to 0.6, 1.3 and 1.5 Mg ha−1 at 0–10, 0–30 and 0–60 cm soil depths, respectively. In the regional pasture soil survey, nitrogen soil stocks at 0–10 and 0–30 soil layers were equal to 1.6 and 3.9 Mg ha−1, respectively, and lower than the stocks found in the native vegetation of paired sites. On the other hand, the soil phosphorus stocks were higher in the CPS and pasture of the paired sites than in the soil of the original vegetation. The original vegetation soil phosphorus stocks were equal to 11, 22, and 43 kg ha−1 in the three soil depths, respectively. The soil phosphorus stocks increased in the CPS systems to 30, 50, and 63 kg ha−1, respectively, and in the pasture pair sites to 22, 47, and 68 kg ha−1, respectively. In the regional pasture survey, the soil phosphorus stocks were lower than in the native vegetation, and equal to 9 and 15 kg ha−1 at 0–10 and 0–30 depth layer. The findings of this paper illustrate that land-use changes that are currently common in Brazil alter soil concentrations, stocks and elemental ratios of carbon, nitrogen and phosphorus. These changes could have an impact on the subsequent vegetation, decreasing soil carbon, increasing nitrogen limitation, but alleviating soil phosphorus deficiency.

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“…On the other hand, the conventional cassava system had 54% less carbon than the secondary forest. Sacramento et al (2013), comparing conservationist systems against conventional systems, verified that the forest-crop-livestock system caused less loss of C, compared to the conventional system, where losses were up to 58.87 Mg ha -1 .…”

Section: ----------------------------G Kg -1 ------------------------mentioning

confidence: 93%

Carbon Management Index and Carbon Stock of a Cohesive Oxisol Under Different in the Region Northeast of Brazil

Paes¹,

Dias²,

Fernandes³

et al. 2018

JAS

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The objective of this study was to evaluate the soil organic carbon fractions and the carbon management index (CMI) in a cohesive oxisol under different uses. Conventional cassava planting (CC), pasture (PP), and 7-and 12-year agroforestry systems (AF7 and AF12, respectively), were tested against secondary forest (SF). Soil samples of these areas were physically fractionated in order to determine total organic matter (TOC) as well as the labile-(LOC) and non-labile (NOC) fractions of the soil organic matter, as well as carbon management index (CMI). Total organic C ranged from 14.17 to 27.20 g kg -1 of soil, showing no differences in the surface layer among the land uses as compared to the secondary forest. No differences were found in the surface layer for LOC as well, except for the AF12 where LOC was higher. This condition accounts for higher microbial activity and nutrient cycling in the soil. This system also showed higher CMI values, pointing to a better response of soil quality under long-term agroforestry system. This system improved soil organic matter, regardless of the depth. On the other hand, conventional cassava and planted pasture systems reduced carbon in soil. In conclusion, the agroforestry system is the best choice of farmers, when they seek for better soil quality.

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Soil carbon and nitrogen stocks in traditional agricultural and agroforestry systems in the semiarid region of Brazil

Cited by 38 publications

References 33 publications

Changes in soil carbon, nitrogen, and phosphorus due to land-use changes in Brazil

Changes in soil carbon, nitrogen, and phosphorus due to land-use changes in Brazil

Changes in soil carbon, nitrogen and phosphorus due to land-use changes in Brazil

Carbon Management Index and Carbon Stock of a Cohesive Oxisol Under Different in the Region Northeast of Brazil

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