Microbial biomass and soil chemical properties under different land use systems in northeastern Pará

Lopes, Elessandra Laura Nogueira; Fernandes, Antônio Rodrigues; Ruivo, Maria de Lourdes Pinheiro; Cattânio, José Henrique; Souza, Gladys Ferreira de

doi:10.1590/s0100-06832011000400006

Cited by 17 publications

(15 citation statements)

References 25 publications

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“…The values for SMBC and SMBN agreed with results of earlier studies conducted in the same region (Rangel-Vasconcelos et al, 2005;Sotta et al, 2008;Lopes et al, 2011;Melo et al, 2012). Bittencourt et al (2006) found a higher SMBN content in Amazonian soils under secondary vegetation in the rainy season.…”

Section: Discussionsupporting

confidence: 88%

Effect of Water Availability on Soil Microbial Biomass in Secondary Forest in Eastern Amazonia

Rangel‐Vasconcelos

Zarin²,

Oliveira

et al. 2015

Rev. Bras. Ciênc. Solo

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Soil microbial biomass (SMB) plays an important role in nutrient cycling in agroecosystems, and is limited by several factors, such as soil water availability. This study assessed the effects of soil water availability on microbial biomass and its variation over time in the Latossolo Amarelo concrecionário of a secondary forest in eastern Amazonia. The fumigation-extraction method was used to estimate the soil microbial biomass carbon and nitrogen content (SMBC and SMBN). An adaptation of the fumigation-incubation method was used to determine basal respiration (CO 2 -SMB). The metabolic quotient (qCO 2 ) and ratio of microbial carbon:organic carbon (C MIC :C ORG ) were calculated based on those results. Soil moisture was generally significantly lower during the dry season and in the control plots. Irrigation raised soil moisture to levels close to those observed during the rainy season, but had no significant effect on SMB. The variables did not vary on a seasonal basis, except for the microbial C/N ratio that suggested the occurrence of seasonal shifts in the structure of the microbial community.

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Section: Discussionsupporting

confidence: 88%

Effect of Water Availability on Soil Microbial Biomass in Secondary Forest in Eastern Amazonia

Rangel‐Vasconcelos

Zarin²,

Oliveira

et al. 2015

Rev. Bras. Ciênc. Solo

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“…Nitrogênio mineral e microbiano do solo em sistemas agroflorestais com palma de óleo na Amazônia oriental Em geral, os valores de C orgânico e N total foram consistentes com valores obtidos em outros estudos realizados na Amazônia Oriental (Desjardins et al 2004;Silva et al 2006;Lopes et al 2011). A semelhança entre os tipos de vegetação quanto a concentração de N e relação C/N do solo, e a maior concentração de C no solo sob o SAF com alta diversidade de espécies em relação à floresta secundária, evidenciam o caráter conservacionista do solo dos sistemas de produção de palma de óleo avaliados.…”

Section: Discussão C Orgânico N Total E Relação C/n Do Solounclassified

“…O percentual médio de N imobilizado pela microbiota do solo (N mic :N tot ), na época chuvosa, foi elevado (acima de 13%), o que não é incomum em solos tropicais. Gama-Rodrigues et al (2005) registraram valores de N mic :N tot próximos de 20% no final da época chuvosa, enquanto Lopes et al (2011) relataram valores acima de 48% em SAFs sucessionais na Amazônia Oriental.…”

Section: Discussão C Orgânico N Total E Relação C/n Do Solounclassified

Nitrogênio mineral e microbiano do solo em sistemas agroflorestais com palma de óleo na Amazônia oriental

et al. 2013

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RESUMOO sucesso da produção de palma de óleo (Elaeis guineensis Jacq.) em sistemas agroflorestais (SAFs) na Amazônia está condicionado ao manejo sustentável do solo, em especial dos atributos químicos e microbiológicos. Nosso objetivo foi avaliar o impacto de SAFs com palma de óleo sobre os teores de nitrogênio (N) mineral e microbiano do solo, em função da sazonalidade pluviométrica. Avaliamos diferentes formas de N do solo (N microbiano, nitrato, amônio), além da concentração de carbono (C) do solo, em SAFs com baixa e alta diversidade de espécies cultivadas, os quais foram comparados com uma floresta secundária adjacente de 13 anos de idade. Para a maioria das variáveis analisadas (N total, relação C:N, N microbiano, relação N microbiano:N total, amônio) houve diferença significativa somente entre as épocas de amostragem. A concentração média de C no solo sob o SAF com alta diversidade (15,6 mg g -1 ) foi maior do que na floresta (13 mg g -1 ). Na época chuvosa a concentração de nitrato no SAF com alta diversidade foi 5,1 mg (N) kg -1 (solo), maior do que nos demais tipos de vegetação, resultando em menor concentração média de amônio no solo sob esse SAF, cujo valor foi 9,6 mg (N) kg -1 (solo). A mineralização do N no SAF com baixa diversidade, na época seca, foi 0,1 mg (N) kg -1 (solo) dia -1, menor do que nos demais tipos de vegetação. As variáveis analisadas foram mais sensíveis à sazonalidade da precipitação pluviométrica do que à conversão de floresta secundária em SAFs com palma de óleo. PALAVRAS-CHAVE: amônio, dendezeiro, Elaeis guineensis, nitrato Soil mineral and microbial nitrogen in oil palm-based agroforestry systems in eastern Amazon ABSTRACTThe success of oil palm (Elaeis guineensis Jacq.)-based agroforestry systems (oil palm-AFS) depends on sustainable soil management, especially of soil chemical and microbiological characteristics. Our objective was to evaluate the impact of oil palm-AFS on soil mineral and microbial nitrogen (N) in contrasting rainfall seasons. We evaluated different soil nitrogen (N) forms (microbial-N, nitrate, ammonium) and soil carbon concentration in oil palm-AFS with low and high diversity of species planted, which were compared with an adjacent 13-yr-old secondary forest. Most variables (total N, C:N ratio, microbial-N, microbial-N:total N ratio, ammonium, and net nitrification rate) varied only in response to rainfall seasonality. Soil C was significantly higher in the high diversity AFS (15.6 mg g -1 ) than in the secondary forest (13.0 mg g -1 ). In the rainy season, nitrate concentration (5.1 mg N kg -1 soil) was higher in the high diversity AFS than in other vegetation types; consequently, the average soil ammonium concentration (9.6 mg N kg -1 soil) was significantly lower in the high diversity AFS. Net N mineralization in the low diversity AFS (0.1 mg N kg -1 soil day -1 ) in the dry season was significantly lower than in other vegetation types. The soil variables were more sensitive to the rainfall seasonality than to the conversion of secondary forest to oil p...

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“…The highest MBN concentration occurred in the NT-8 area and was potentially related to N immobilization in the soil (Lopes et al, 2011) because of high levels of OM. The continuous deposition of OM by no-tillage systems favors increases in OM, OM conservation, and the gradual release of nutrients based on the mineralization rate (Santiago et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

“…The environmental stress conditions, such as acidity, temperature, elevated heavy metal contents, soil compaction, or low OC nutritional quality, reduce the efficiency of the microbial biomass and MBN (Lopes et al, 2011), which results in a low MBN/Total N ratio. In highly weathered soils with high acidity and low pH, such as those in the study area, CO undergoes rapid decomposition and mineralization, which results in a low soil nutrient supply.…”

Section: Resultsmentioning

confidence: 99%

Soil attributes under different crop management systems in an Amazon Oxisols

et al. 2015

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Soil biological properties have a high potential for use in assessing the impacts of crop systems. The objective of this study is to evaluate the effects of cropping systems on the biological attributes of an oxisol in the Amazonian state of Pará. The treatments consisted of approximately 20-year-old secondary vegetation, recovered pasture, no-tillage systems (NT) maintained for 4 and 8 years after planting with corn (Zea mays L.) and soybean (Glycine max L.), and conventional tillage (CT) systems every 2 years after planting with rice (Oryza sativa L.) and soybean. The microbial biomass to nitrogen ratio was higher in the NT system (0.68 mg kg -1 ), and the NT system had greater microbial NT8. Thus, the contributions of organic matter from straw improved the soil quality in these areas. The total organic carbon (TOC) content was greater in the secondary forest and CT areas (46.7 and 48.0 mg kg -1 , respectively), potentially due to the higher amounts of organic matter and organic matter mineralization in these areas. However, the largest TOC stocks were observed in the pasture, which corresponded with greater carbon storage (63.5 Mg ha -1). By contrast, the no-till systems were not efficient for storing C, with concentrations of 5.0 and 5.3 Mg ha -1 in NT-4 and NT-8, respectively. These results may reflect the short period that these systems were adopted and the vast microbial activity that was observed in these areas, with microbial quotients of 8.03 and 10.41% in NT-4 and NT-8, respectively.

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Microbial biomass and soil chemical properties under different land use systems in northeastern Pará

Cited by 17 publications

References 25 publications

Effect of Water Availability on Soil Microbial Biomass in Secondary Forest in Eastern Amazonia

Effect of Water Availability on Soil Microbial Biomass in Secondary Forest in Eastern Amazonia

Nitrogênio mineral e microbiano do solo em sistemas agroflorestais com palma de óleo na Amazônia oriental

Soil attributes under different crop management systems in an Amazon Oxisols

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