Soil carbon losses in conventional farming systems due to land-use change in the Brazilian semi-arid region

Medeiros, Aldair de Souza; Maia, Stoécio Malta Ferreira; Santos, Thiago Cândido dos; Gomes, Tâmara Cláudia de Araújo

doi:10.1016/j.agee.2019.106690

Cited by 27 publications

(12 citation statements)

References 46 publications

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“…However, among all land uses, AG showed the lowest STK.TOC (6.8 Mg ha −1 ) and STK.TN (0.28 Mg ha −1 ) means. These small values are related to (i) climate conditions (high temperatures, high solar radiation and a very long dry season) present in the semi-arid region of Brazil; (ii) the management practices (fire and conventional tillage) used in rainfed farms [11], confirming studies carried out around the world [33].…”

Section: Stocks Of Toc (Stktoc) and Tn (Stktn)supporting

confidence: 69%

Land-Use Effect on Soil Carbon and Nitrogen Stock in a Seasonally Dry Tropical Forest

et al. 2020

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Total organic carbon (TOC) and total nitrogen (TN) concentration in the soil are an indicator of soil degradation. To understand how land-use may impact these concentrations in seasonally dry tropical forests (SDTF), we analyzed the effect of four land-uses on TOC stocks (STK.TOC) and TN stocks (STK.TN) in a semi-arid region of Brazil. Soil samples were collected in 12 trenches (three sites × four land-uses—dense caatinga (DC), open caatinga (OC), pasture (PA) and agriculture (AG)), in the 0–10; 10–20 and 20–30 cm layers or as far as the bedrock. The data were compared by the Kruskal–Wallis test (p ≤ 0.05) and similarity investigated by cluster analysis. STK.TOC and STK.TN the surface layer (0–10 cm) showed no significant difference (p ≤ 0.05) between the DC; OC and PA land-uses. The similarity in STK.TOC and STK.TN values between DC, OC and PA, indicate that it is possible to explore SDTF to produce biomass and protein by adopting open caatinga and pasture land uses on Neosols with very low TOC stocks. The greatest reduction in STK.TOC and STK.TN in the agriculture land-use may lead to soil degradation and contribute to the addition of CO2 to the atmosphere.

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Section: Stocks Of Toc (Stktoc) and Tn (Stktn)supporting

confidence: 69%

Land-Use Effect on Soil Carbon and Nitrogen Stock in a Seasonally Dry Tropical Forest

et al. 2020

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“…These higher contents in the NF area are due to the higher litter deposition of different forest extracts (Ozório et al, 2019), which increases the TOC contents in the most superficial layers of the soil (Assunção et al, 2019). Several authors have reported higher TOC contents in higher native areas compared with production systems in different regions of Brazil, soil types, and management systems (Borges et al, 2019;Maia et al, 2019;Santos et al, 2019;Ferreira et al, 2020;Medeiros et al, 2020).…”

Section: Resultsmentioning

confidence: 99%

Stock and indices of carbon management under different soil use systems

Morais

Silva

Rosset

et al. 2021

Rev. Bras. Ciênc. Ambient. (Online)

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The aim of this study was to evaluate the stock of total organic carbon (TOC) and to perform the physical-granulometric fractionation of soil organic matter (SOM) in different management systems (MS). Three MS and one reference area of Native Forest (NF) were studied, and the three systems were sugarcane (SC), permanent pasture (PP) and no-tillage system (NTS). Soil samples were collected in the 0–0.05, 0.05–0.10, 0.10–0.20-m layers. Soil density (Sd), TOC, stratification index (SI), carbon stock (StockC), variation in StockC (∆StockC), carbon content of particulate organic matter (C-POM) and mineral organic matter (C-MOM), carbon stock index (CSI), lability (L), lability index (LI), and carbon management index (CMI) were determined. The MS presented higher Sd than the NF area. The NF area had higher TOC contents in the first layers, reaching 25.40 g kg-1 in the 0–0.05-m layer, with the PP area having higher values than the NF in the 0.10–0.20-m layer. The NF area showed the highest levels of C-POM (15.25 g kg-1) and C-MOM (10.15 g kg-1) in the first layer. In the 0.10–0.20-m layer, the PP and NTS systems were superior to the others. Regarding the C-MOM content, SC and PP showed higher levels in the 0.10–0.20-m layer. The highest CMI values were observed in the NTS and PP areas in the 0.10–0.20-m layer. The MS increased the Sd and reduced the TOC levels. The different MS modified the POM fraction, and the MOM fraction was most impacted by the SC area. The lability of the SOM was altered by the MS in the most superficial layers.

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“…O Brasil apresenta uma extensão territorial de 1,03 milhões de km² com a predominância do semiárido, onde o estado de Pernambuco inclui 87,6% das suas terras. A região semiárida do território brasileiro contempla 1.189 municípios de nove estados do país (e.g., Bahia, Ceará, Alagoas, Minas Gerais, Pernambuco, Paraíba, Piauí, Rio Grande do Norte e Sergipe) (Figura 1), sendo considerado o mais extenso e populoso de toda a América Latina, apresentando aproximadamente 22 milhões de habitantes (Santos e Farias, 2017;Medeiros et al, 2020;. O semiárido brasileiro tem predominância do bioma Caatinga, que é considerada ecologicamente rica e com várias espécies endêmicas.…”

Section: Semiárido Brasileirounclassified

Intensificação de sistemas de produção de palma forrageira por meio de consorciação rotativa com gramíneas, leguminosas e oleaginosas: uma revisão

Salvador¹,

Jardim²,

Júnior³

et al. 2021

Rev. Bras. Geog. Fis.

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The low forage productivity in the Brazilian semi-arid is linked to water scarcity and climatic conditions, these abiotic disturbances affect the development of livestock and the local economy. Seeking to circumvent the situation, the use of forage species adapted to climatic conditions is of paramount importance, such as forage cactus, a crop rich in nutrients, much appreciated by animals, but lacking in fiber and protein, making it necessary to use other forage plants like sorghum, millet, pigeon pea and forage sunflower, both species have high levels of fiber and protein, and with this, they complement each other and enable the production of more balanced diets for herds. However, the higher yield of crops is observed with the implementation of resilient practices such as irrigation, adoption of mulch, intercropping, which promotes more sustainable systems with high forage potential. In this review, the objective was to evaluate the use of different agronomic practices to increase the productivity and sustainability of forage cactus crops and crops of regional appeal to the Brazilian semi-arid region. It is concluded that the sustainable intensification of agricultural crops, through complementary irrigation, mulch, intercropping with forage cactus, and plant species adapted to the Brazilian semi-arid region, can promote an increase in forage production without adverse effects on ecosystems.

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Soil carbon losses in conventional farming systems due to land-use change in the Brazilian semi-arid region

Cited by 27 publications

References 46 publications

Land-Use Effect on Soil Carbon and Nitrogen Stock in a Seasonally Dry Tropical Forest

Land-Use Effect on Soil Carbon and Nitrogen Stock in a Seasonally Dry Tropical Forest

Stock and indices of carbon management under different soil use systems

Intensificação de sistemas de produção de palma forrageira por meio de consorciação rotativa com gramíneas, leguminosas e oleaginosas: uma revisão

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