Frações de nitrogênio em Luvissolo sob sistemas agroflorestais e convencional no semi-árido cearense

Maia, Stoécio Malta Ferreira; Xavier, F. A. da S.; Oliveira, Teógenes Senna de; Mendonça, Eduardo de Sá; Filho, João Ambrósio Araújo

doi:10.1590/s0100-06832008000100036

Cited by 22 publications

(15 citation statements)

References 26 publications

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“…Respectively, the TN levels in the TR, AGP and SIL systems were 56, 13.9 and 15.8 % of the levels under NV at 0-6 cm; 42.2, 16.8 and 14.9 % of the NV levels at 6-12 cm; and 30.8, 16.2 and 4.4 % of the NV levels at 12-20 cm (Figure 6). Maia et al (2008) found TN levels of 5.46 and 3.02 g kg -1 in the 0-6 and 6-12-cm layers in the same experimental area, respectively, and attributed these high values to the higher soil clay content and the effect of organic matter on the topsoil, thus demonstrating the relationship between the organic and mineral soil fractions. Significant TN losses were observed in the TR agricultural system over time; the TN levels were 83.3 and 79.8 % lower in 2011 than they were in 2002.…”

Section: Total Soil Nitrogen Levels and Stocksmentioning

confidence: 69%

“…These results clearly indicate that any tillage, regardless of intensity, promotes reduced soil TOC levels (Figure 2) (Maia et al, 2007(Maia et al, , 2008Veum et al, 2011;Novara et al, 2012); this is most likely due to an increased rate of organic matter decomposition (Novara et al, 2012). The landform can aggravate these disturbances and maximize the effects of the different studied management systems.…”

Section: Soil Total Organic Carbon Levels and Stocksmentioning

confidence: 85%

“…Soil organic matter is primarily regulated by the input and decomposition of organic residues (Maia et al, 2008). The main constituents of SOM are C (52-58 %) and N (3.7-7 %); the soil levels and pools of these elements vary according to the application rates of plant and animal residues and to the losses resulting from erosion and oxidation by soil microorganisms (Souza et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…These conditions result in decreased levels of C and N and, consequently, increased C-CO 2 emissions into the atmosphere and decreased N cycling (Sharma et al, 2005). Conversely, conservation systems that prioritize the organic residue input and reduced tillage, including no-tillage (Souza et al, 2009;Maia et al, 2010), agrosilvopastoral systems (Maia et al, 2007;Aguiar et al, 2010), silvopastoral systems Tonucci et al, 2011), and organic farming , have proved efficient in maintaining and sometimes raising the soil C and N levels (Maia et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Studies conducted in the semiarid region of Brazil addressed the impacts of AFSs on soil quality ; nutrient redistribution (Nogueira et al, 2008); soil, water and nutrient losses by water erosion (Aguiar et al, 2010); N fractions (Maia et al, 2008); organic C reservoirs (Maia et al, 2007); and on soil physical quality (Silva et al, 2011). These studies indicated that AFSs may be viable and sustainable alternatives for soil and water use in this region.…”

Section: Introductionmentioning

confidence: 99%

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

Sacramento¹,

Araújo²,

Escobar

et al. 2013

Rev. Bras. Ciênc. Solo

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SUMMARYIn the semiarid region of Brazil, inadequate management of cropping systems and low plant biomass production can contribute to reduce soil carbon (C) and nitrogen (N) stocks; therefore, management systems that preserve C and N must be adopted. This study aimed to evaluate the changes in soil C and N stocks that were promoted by agroforestry (agrosilvopastoral and silvopastoral) and traditional agricultural systems (slash-and-burn clearing and cultivation for two and three years) and to compare these systems with the natural Caatinga vegetation after 13 years of cultivation. The experiment was carried out on a typical Ortic Chromic Luvisol in the municipality of Sobral, Ceará, Brazil. Soil samples were collected (layers 0-6, 6-12, 12-20, 20-40 and 40-60 cm) with four replications. The plain, convex and concave landforms in each study situation were analyzed, and the total organic C, total N and densities of the soil samples were assessed. The silvopastoral system promoted the greatest long-term reductions in C and N stocks, while the agrosilvopastoral system promoted the smallest losses and therefore represents a sustainable alternative for soil C and N sequestration in these semiarid conditions. The traditional agricultural system produced reductions of 58.87 and 9.57 Mg ha -1 in the organic C and total N stocks, respectively, which suggests that this system is inadequate for these semiarid conditions. The organic C stocks were largest in the concave landform in the agrosilvopastoral system and in the plain landform in the silvopastoral system, while the total N values were highest in the concave landform in the native, agrosilvopastoral and silvopastoral systems.Index terms: carbon sequestration, conservation management, shifting cultivation. 0-6, 6-12, 12-20, 20-40 e 40-60 cm, em RESUMO: ESTOQUES DE CARBONO E NITROGÊNIO DO SOLO EM SISTEMAS AGRÍCOLAS TRADICIONAL E AGROFLORESTAIS NO

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Section: Total Soil Nitrogen Levels and Stocksmentioning

confidence: 69%

Section: Soil Total Organic Carbon Levels and Stocksmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Sacramento¹,

Araújo²,

Escobar

et al. 2013

Rev. Bras. Ciênc. Solo

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Combination of organic amendments as a soil recovering strategy at a desertification hotspot in the Brazilian semiarid

de Souza,

Guedes,

Pompeu

et al. 2023

Land Degrad Dev

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The use of manure, organic mulch, and legume‐based fertilizers can increase soil fertility in semiarid regions. However, the effects of such practices on soils prone to desertification are unknown. This study aimed to evaluate soil fertility and herbaceous stratum yield on soils amended with different organic inputs in the desertification hotspot of Irauçuba, Ceará state, Brazil. The experiments were performed in two areas with different soils (Planosol and Cambisol), in randomized blocks with a 2 × 2 × 3 + 1 factorial design. The factors consisted of (i) mulch (presence or absence of Copernicia prunifera [carnauba palm] straw), (ii) manure (sheep or cattle), and (iii) legume‐based fertilizer (Mimosa tenuiflora [jurema], Mimosa caesalpiniifolia [sabiá], and Leucaena leucocephala [leucena]), in addition to an untreated control, with three replicates. Soil chemical attributes and herbaceous stratum yield were assessed in the two areas. Positive effects of the combined use of carnauba palm straw, manures, and legume‐based fertilizers on soil fertility were more evident for Planosol than for Cambisol. The combination of sheep manure with sabiá‐based fertilizer in Planosol, and cattle manure and leucena‐based fertilizer in Cambisol increased herbaceous stratum yield. Herbaceous stratum yield in Planosol is more responsive to the input of great amounts of soil nutrients (especially P) and it increases soil organic matter levels, while in Cambisol, herbaceous stratum yield is more associated with the ability of inputs to make nutrients readily available. The use of organic amendments can reverse, in the short‐term, degradation and desertification processes of soils in the Brazilian semiarid region.

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Does biomass production depend on plant community diversity?

et al. 2012

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In order to ensure the sustainability of agroecosystems, biodiversity must be a priority. Agroforestry, which includes trees, is an example of such diverse systems. We evaluated plant diversity and aboveground biomass production to assess whether areas under fallow following traditional cultivation return to their initial condition. Also, plant diversity and aboveground biomass production were assessed in agroforestry systems (AFS) to determine if these were similar to unmanaged ecosystems. Another objective of the study was to observe the influence of plant diversity on aboveground biomass production in plant communities and also in the population of the dominant species, Cordia oncocalyx. Plant diversity was evaluated by assessing species richness, as well as using Shannon's (H 0 ) and Pielou's (J 0 ) indices. Aboveground plant biomass was evaluated in two AFS: agrosilvopastoral (ASP) and silvopastoral (SP), and also in a traditionally managed agricultural system (AG), areas that had been under fallow for six years (F6) and nine years (F9) and an area of unmanaged caatinga (CAT) vegetation. We observed that the ASP system had a lower diversity and number of species, especially tree species. However, it sustained the same total biomass production as CAT and fallow areas. The SP system, despite having lower H 0 and J 0 indices as well as lower total biomass production, had a similar number of species to CAT and cropped and fallow systems AG, F6 and F9. Plant biomass in F6 and F9 had recovered to productivity levels of unmanaged CAT vegetation; however the diversity indices were not restored to the same level. Plant diversity did not have an effect on the productivity of the agroecosystems. Likewise, annual biomass production by C. oncocalyx is not dependent upon diversity, but it is influenced by the growth stage of individuals.

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Frações de nitrogênio em Luvissolo sob sistemas agroflorestais e convencional no semi-árido cearense

Cited by 22 publications

References 26 publications

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

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

Combination of organic amendments as a soil recovering strategy at a desertification hotspot in the Brazilian semiarid

Does biomass production depend on plant community diversity?

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