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Gradients in N-cycling attributes along forestry and agricultural land-use systems are indicative of soil capacity for N supply. Repositório Alice
FAGOTTI, D. S. L.; MIYAUCHI, M. Y. H.; OLIVEIRA, A. G.; SANTINONI, I. A.; EBERHARDT, D. N.; NIMTZ, A.; RIBEIRO, R. A.; PAULA, A. M.; QUEIROZ, C. A. S.; ANDRADE, G.; ZANGARO, W.; NOGUEIRA, M. A..
Indicators of soil quality associated with N-cycling were assessed under different land-use systems (native forest ? NAT, reforestation with Araucaria angustifolia or Pinus taeda and agricultural use ? AGR) to appraise the effects on the soil potential for N supply. The soil total N ranged from 2 to 4g⁄ kg (AGR and NAT, respectively), and the microbial biomass N ranged from 80 to 250 mg⁄ kg, being higher in NAT and A. angustifolia, and lower in P. taeda and AGR sites. Activities of asparaginase (ca. 50?200 mg NH 4 + -N ⁄ kg per h), glutaminase (ca. 200?800 mg NH -N ⁄ kg per h) and urease (ca. 80?200 mg NH -N ⁄ kg ⁄ h) were also more intense in the NAT and A. angustifoliareforested soils,...
Tipo: Separatas Palavras-chave: Solo; Qualidade; Nitrificação; Amonificação; Soil quality; Nitrification; Ammonification.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/940939
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Influence of mycorrhizas, organic substrates and container volumes on the growth of Heliocarpus popayanensis Kunth. Repositório Alice
ZANGARO, W.; TOREZAN, J. M. D.; ROSTIROLA, L. V.; SOUZA, P. B. de; NOGUEIRA, M. A..
ABSTRACT: This work assessed, under nursery conditions, the effect of arbuscular mycorrhizal fungi (AMF) inoculation on the initial growth of the woody species Heliocarpus popayanensis Kunth in containers of different sizes (nursery tubes of 50 or 250 cm3) containing composted cattle manure or organic Pinus spp bark compost diluted (0 to 100%, each 9%) with low fertility soil. Plants in cattle manure grew more than plants grown in pine bark manure independent of tube size. AMF were more efficient in improving plant growth in 250 cm3 tubes than in 50 cm3 tubes independent of the substrates. Mycorrhizal plants grown in 50 cm3 tubes showed less growth than non-mycorrhizal ones irrespective of the substrates. Nevertheless, this growth depression decreased with...
Tipo: Artigo de periódico Palavras-chave: Micorriza..
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1044487
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Infection intensity, spore density and inoculum potential of arbuscular mycorrhizal fungi decrease during secondary succession in tropical Brazilian ecosystems. Repositório Alice
ZANGARO, W.; ANSANELO, A. P.; LESCANO, L. E. A. M.; ALVES, R. de A.; RONDINA, A. B. L.; NOGUEIRA, M. A..
Little is known about the relationship involving arbuscular mycorrhizal (AM) fungi and functional groups of plants that characterize different phases of tropical succession.We appraised the AM infection intensity of root cortex and spore density in the soil in sites over tropical successional gradients (grassland, secondary forest and mature forest) for several years in Araucaria,Atlantic and Pantanal ecosystems in Brazil. The intensity ofAMinfection decreasedwith advancing successional stages in all ecosystems and it was around 60–80% in early stages of succession, 37–56% in secondary forests and 19–29% in mature forests. Similarly, the AM spore number also decreased with advancing succession and was the highest in early stages (73–123 g?1), intermediate...
Tipo: Separatas Palavras-chave: Fertilidade do solo; Soil fertility.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/940931
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Arbuscular mycorrhizas increase survival, precocity and flowering of herbaceous and shrubby species of early stages of tropical succession in pot cultivation. Repositório Alice
RONDINA, A. B. L.; LESCANO, L. E. A. M.; ALVES, R. de A.; MATSUURA, E. M.; NOGUEIRA, M. A.; ZANGARO, W..
Arbuscular mycorrhizal fungi (AMF) are an important biotic factor that influences tropical ecological succession and differently affect the woody species belonging to different successional stages. However, little is known about the influence of AMF on growth and reproduction of herbaceous and shrubby species of early phases of tropical succession. Thus, we assessed the effect of AMF on the development of 27 heliophilous herbaceous and shrubby tropical species. Plants were grown in greenhouse, in low- and high-fertility soils, with or without AMF, for 100 d. Most species grown with AMF exhibited high root infection intensity (80%), irrespective of soil fertility. In the low-fertility soil, non-mycorrhizal plants exhibited about 88% less shoot dry mass...
Tipo: Separatas Palavras-chave: Cultivo de plantas.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1002337
Registros recuperados: 4
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