Soil enzymatic activities and microbial biomass in an integrated agroforestry chronosequence compared to monoculture and a native forest of Colombia

Vallejo, Victoria E.; Roldán, Fabio; Dick, Richard P.

doi:10.1007/s00374-010-0466-8

Cited by 68 publications

(46 citation statements)

References 68 publications

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“…Soil microbial biomass carbon is influenced by quantity and diversity of fresh organic residues as found in the native forest (VALLEJO et al, 2010). In AFS13, several factors may have influenced the increased MBC, such as better microclimate for the soil microorganisms (BELSKY et al, 1989) or different plant residues, organic matter, vegetation and plant species composition added in AFS system (TANGJANG et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

Soil organic matter pools in a tropical savanna under agroforestry system in Northeastern Brazil

2014

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RESUMO -This study aimed at quantifying total organic carbon stocks and its pools in Acrisol under agroforestry systems with six (AFS6) and thirteen years old (AFS13), slash-and-burn agriculture (SBA) and savanna native forest (SNF) in northeastern Brazil. Soil samples were collected at 0-0.05 m, 0.05-0.10 m, 0.10-0.20 m and 0.20-0.40 m depths in the dry and rainy seasons to evaluate total organic carbon (TOC) stocks and labile carbon (LC), fulvic acid fraction (C-FAF), humic acid fraction (C-HAF), humin (C-HF) and microbial biomass carbon (Cmic) contents. Additionally, carbon management index (CMI) was determined. Higher TOC stocks (97.7 and 81.8 Mg ha -1 for the 0-0.40 m depth in the dry and rainy seasons, respectively) and LC, humic substances and Cmic contents were observed in the AFS13 in all the depths. CMI also was higher in the AFS13 (0-0. 05 m: 158 and 86; 0.05-0.10 m: 171 and 67, respectively for the dry and rainy seasons) especially when compared to the SBA (0-0.05 m: 5.6 and 5.4; 0.05-0.10 m: 5.3 and 5.8, respectively for dry and rainy seasons). The agroforestry systems increased soil quality through the conservation of organic matter and can be considered an excellent strategy to assurance sustainability in tropical soil of Northeastern Brazil Palavras-chave: Soil quality; Microbial biomass; Carbon management index. 0-0,05 m; 0,05-0,10 m; 0,10-0,20 m; e 0,20-0,40 5 m: 158 e 86, 0,10 m: 171 e 67, respectivamente, nas estações seca e chuvosa), especialmente quando comparado com 05 m: 5,6 e 5,4; 0,10 m: 5,3 e 5,8, respectivamente, nas FRAÇÕES DA MATÉRIA ORGÂNICA DO SOLO NO CERRADO SOB SISTEMA AGROFLORESTAL NO NORDESTE DO BRASIL ABSTRACT -Este estudo teve como objetivo quantificar os estoques de carbono orgânico total e de suas frações em um argissolo sob sistemas agroflorestais com 6 (SAF6) e 13 anos de idade (SAF13), agricultura de corte-e-queima (ACQ) e floresta nativa de Cerrado (FNC) no Nordeste do Brasil. As amostras de solo foram coletadas nas estações seca e chuvosa, nas camadas de m, para avaliar os estoques de carbono orgânico total (COT) e os teores de carbono lábil (CL), fração ácido fúlvico (C-FAF), fração ácido húmico (C-FAH) e humina (C-FH) e carbono da biomassa microbiana (Cmic

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Section: Discussionmentioning

confidence: 99%

Soil organic matter pools in a tropical savanna under agroforestry system in Northeastern Brazil

2014

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“…3). The increased microbial activity in the AFS soil, compared to monoculture (Vallejo et al 2010;Rodrigues et al 2015), is due to increased variety of residues (leaves and roots debris) with different chemical characteristics available to the decomposing microorganisms. As the group of microorganisms varies in its ability to explore different biochemical features, a larger variety of debris allows better use of the different resources by a broad range of microorganisms, accelerating the release of nutrients to the soil (Cotrufo et al 2013).…”

Section: Accumulated Litter and Microbial Respirationmentioning

confidence: 99%

Dynamics of leaf litter and soil respiration in a complex multistrata agroforestry system, Pernambuco, Brazil

Costa

Araújo

Souza-Motta

et al. 2016

Environ Dev Sustain

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High litter inputs in agroforestry systems contribute to soil microbial activity, soil fertility and productivity. Considering that the cycling of organic matter is essential to the maintenance of physical-chemical and microbiological properties of the soil, the aims of this work were to estimate the production, accumulation and decomposition of litter, and assess soil microbial respiration in a complex multistrata agroforestry system located in the north-east of Brazil. This agroforestry system has three strata formed by forest and fruit trees and species of multiple uses. During 3 years (2011-2013), leaf litter was sampled monthly to account for litterfall and quarterly to account for litter accumulation. The rates of litter decomposition were estimated using the ratio produced-to-accumulated litter, and the correlation between litter fall and rainfall was calculated. Precipitation data were provided by the water and climate agency of Pernambuco (APAC). Soil samples (0-15 cm) were also taken quarterly, simultaneously with the litter accumulation samples, and soil microbial respiration was assessed using the capture, by a KOH solution, of the evolved CO 2 . The annual production of leaf litter was stable in the 3 years of study in this agroforestry system, and the monthly input of litter to the soil was influenced by rainfall, being higher in the dry seasons. The accumulated litter on the ground was constant, as was microbial activity (respiration) through time. The estimated litter decomposition rates were 1.49 (first year), 1.33 (second year) and 1.42 (third year), being considered rapid rates of decomposition. This guarantees (to the farmer) that this system is capable of maintaining soil fertility and eliminates the need for chemical fertilizers.

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“…Deforestation, however, causes severe organic matter removal (Solomon et al 2002;Smaill et al 2010), major loses of nitrogen (N) and phosphorus (P) (Bond 2010), a reduction in the size of soil microbial populations (Dinesh et al 2004;Hartmann et al 2009;Zechmeister-Boltenstern et al 2010;Vallejo et al 2010) and activity of soil enzymes involved in the N and P cycles in the compacted soil (Chaer et al 2009). Deforestation further aggravates the deleterious effects of the high aluminium (Al) content as any regenerating plants in these areas have to take up iron (Fe) for copper (Cu), in the presence of the Al (van Schaik et al 2010)..…”

Section: Introductionmentioning

confidence: 99%

Rhizophagus manihotis promotes the growth of rhizobia-nodulated Vigna luteola L in phosphorus deficient acid montane soils devoid of ground cover vegetation

et al. 2011

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The failure of Vigna luteola L. to colonize tropical montane regions of Venezuela with acid P-deficient soils that lack vegetation has been mainly attributed to the inability of indigenous arbuscular mycorrhizal fungi (AMFi) to be effective suppliers of P to this host plant. To test this hypothesis, Vigna luteola plants were grown in non sterile soil collected from this habitat. Plants became nodulated by indigenous rhizobia (Nod + ) and the roots were colonized by AMFi (AMFi + ). Some plants were inoculated with the arbuscular mycorrhizal fungus Rhizophagus manihotis (AMFg + ). Other plants were fertilized with 6 mM nitrate and 2 mM P to inhibit nodulation (Nod -) and AMFi colonization (AMFi -), respectively and these served as controls. The Nod + AMFi + plants displayed the smallest shoot and nodule dry weights upon harvest, the poorest AMF colonization, lowest foliar mineral content (N, P, Mg, Mn, Fe, Zn, and Cu), highest leaf ureide concentrations and lowest soil dehydrogenase, urease and acid phosphatase activities. Greater growth, nodulation, nutrient uptake, photosynthesis, catabolism of ureides in leaves, leaf superoxide dismutase and soil enzymatic activities were found in Nod + AMFg + plants. The Nod -AMFg + plants grew even better attributed to their higher P uptake that was allocated mainly to the photosynthetic apparatus rather than to N 2 -fixation. The results showed that V. luteola plants inoculated with R. manihotis and nodulated by indigenous rhizobia are capable successfully of colonizing open montane regions devoid of ground cover vegetation. The Nod + AMFg + plants had greater growth, nodulation and root colonization by AMFg resulting in improved nutrient condition, enhanced uptake of nitrate and high catabolism of ureides in leaves than Nod + AMFi + plants. However, more research is needed before the inoculation of open montane regions with AMFg can be recommended to land managers since a) the enhanced N 2 fixation rate in Nod + AMFg + plants have an extra cost of 1.2 mg Pkg −1 leaf dry weight plant −1 which could places an extra burden on the plants grown in the P-deficient soils, and b) the possible impact of AMFg on the microbiology of these former forest soils must be assessed.

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Soil enzymatic activities and microbial biomass in an integrated agroforestry chronosequence compared to monoculture and a native forest of Colombia

Cited by 68 publications

References 68 publications

Soil organic matter pools in a tropical savanna under agroforestry system in Northeastern Brazil

Soil organic matter pools in a tropical savanna under agroforestry system in Northeastern Brazil

Dynamics of leaf litter and soil respiration in a complex multistrata agroforestry system, Pernambuco, Brazil

Rhizophagus manihotis promotes the growth of rhizobia-nodulated Vigna luteola L in phosphorus deficient acid montane soils devoid of ground cover vegetation

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