Soil physical quality of Luvisols under agroforestry, natural vegetation and conventional crop management systems in the Brazilian semi-arid region

Silva, G.L.; Lima, Herdjânia Veras de; Campanha, M. M.; Gilkes, Robert; Oliveira, Teógenes Senna de

doi:10.1016/j.geoderma.2011.09.009

Cited by 90 publications

(75 citation statements)

References 49 publications

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“…After the period of high water availability, the soil began to dry, and both the temperature and air vapor pressure deficit increased, creating conditions that are adverse to gas exchange (D' Ambrosio et al 2006, Mahouachi 2009). Soil water can be retained longer in forests than in agroforests, due to the higher density of plants, lower surface runoff and reduced water loss by evaporation, since less solar radiation can reach the ground (Eastham et al 1988, McDonald et al 2002, Silva et al 2011, Raz-Yaseef et al 2012. It is therefore possible that in SF the higher density of trees and reduced transpiration rates during the dry season were the main responsible factors for the greater soil water content in this system 50 days after the final rainfall, compared to AGP.…”

Section: Discussionmentioning

confidence: 91%

“…Steud. (Campanha et al 2011). Cordia oncocalyx Allemão (locally known as pau-branco), a member of the Boraginaceae, is abundant, presenting 670 individuals per hectare in SF and 80 individuals per hectare in AGP.…”

Section: Plant Species Studiedmentioning

confidence: 99%

“…In the semiarid region of Brazil, studies have focused on the cultivation of maize and pasture, investigating aspects such as water and nutrient loss (Aguiar et al 2010), physical quality of the soil (Silva et al 2011), floristics and phytosociology (Campanha et al 2011), nutrient dynamics, and microclimate (Menezes et al 2002, Maia et al 2008. However, there is no information as to the ecophysiology of plants.…”

Section: Introductionmentioning

confidence: 99%

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Ecophysiology of deciduous plants grown at different densities in the semiarid region of Brazil

Mendes¹,

Lacerda²,

Fernandes³

et al. 2013

Theor. Exp. Plant Physiol.

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Physiological differences in the Cordia oncocalyx tree growing at different densities in two distinct areas were investigated.An agrosilvopastoral system (AGP) and a secondary forest (SF) were studied. Under both types of land-use, C. oncocalyx presented a relative frequency of approximately 50%, and absolute densities of 670 and 80 individuals per hectare, respectively. Net photosynthesis (A), stomatal conductance (g s ), and transpiration (E) were measured, and the SPAD index was recorded in sun leaves from the canopy and shade leaves from the lower canopy, in both the wet and dry seasons. We quantified the dry biomass of leaves and fruit on a per-tree basis at the end of the wet season. Net photosynthesis was higher in shaded leaves in the AGP in the wet season, reaching an average of 4.8 µmol m -2 s -1 against 3.2 µmol m -2 s -1 under SF. As trees began to shed their leaves at the beginning of the dry season and more radiation reached the shaded leaves, there was an increase in SF for A, depending on the intensity of light reaching the leaves. In the sun leaves, gas exchange was similar for the land-use systems during the wet season, but stronger in AGP than under SF during the dry season. This happened when the leaves in AGP retained more relative water content during a period of low gravimetric levels of the soil water. The lower tree density in AGP promoted a higher SPAD index and dry biomass in both the sun and shaded leaves, and allowed greater A, E and g s rates in the sun leaves at the beginning of the dry period.

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Section: Discussionmentioning

confidence: 91%

Section: Plant Species Studiedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ecophysiology of deciduous plants grown at different densities in the semiarid region of Brazil

Mendes¹,

Lacerda²,

Fernandes³

et al. 2013

Theor. Exp. Plant Physiol.

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“…Segundo Tormena et al (1999) e Silva et al (2011), quando a θ PA > θ CC (o limite superior do IHO é a θ CC ) em solos com altos valores de densidade, ocorre uma microestrutura estável do solo que preserva o espaço poroso necessário para a troca de gases.…”

Section: Intervalo Hídrico óTimo (Iho) Horizonte a (Mata) E Ap (Solosunclassified

Intervalo hídrico ótimo e densidade crítica de um Latossolo Amarelo coeso sob diferentes usos no ecossistema Tabuleiro Costeiro

et al. 2016

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Least limiting water range and critical density of a cohesive Yellow Oxisol under different land uses in the Tabuleiro Costeiro ecosystemThe impacts of the use and management on soil physical quality have been quantified using the least limiting water range and the critical density of the soil. The critical soil bulk density obtained by the least limiting water range (LLWR) assists in making decisions on the management conditions adopted or to be adopted in certain soil. This study aimed to determine the LLWR and the critical soil bulk density of a cohesive Oxisoil from Tabuleiros Costeiros of Reconcavo da Bahia subjected to different uses and soil management. We selected three areas on typical cohesive soil, subjected to the following uses and management: native forest (Mata Atlântica), Brachiaria decumbens Stapf, in a state of degradation, and sugar cane, with subsoiling at planting. In each area, 40 samples were taken with undisturbed structure in the central portion of each horizon (A and AB). In the area cultivated with sugarcane, the sample collection was done in the rows. The LLWR in the A horizon of the forest and the sugar cane were similar and both were greater than the pasture on the horizon AB. The LLWR for cane sugar was higher than the forest and this was higher than the pasture. Horizons A and Ap presented higher critical density values than AB for all evaluated uses. The use that showed values of bulk density greater than the critical density was pasture.

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“…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%

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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Soil physical quality of Luvisols under agroforestry, natural vegetation and conventional crop management systems in the Brazilian semi-arid region

Cited by 90 publications

References 49 publications

Ecophysiology of deciduous plants grown at different densities in the semiarid region of Brazil

Ecophysiology of deciduous plants grown at different densities in the semiarid region of Brazil

Intervalo hídrico ótimo e densidade crítica de um Latossolo Amarelo coeso sob diferentes usos no ecossistema Tabuleiro Costeiro

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

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