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No. de sistema: 000031473

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245 0 0 a| Distribution of mycorrhizal fungal spores in soils under agroforestry and monocultural coffee systems in Brazil
520 1 _ a| Deep-rooting trees in agroforestry systems may promote distribution of spores of arbuscular mycorrhizal fungi (AMF) at deeper soil levels. We investigated the vertical distribution of AMF spores in Oxisols under agroforestry and monocultural (unshaded) coffee systems in on-farm experiments (Brazil). The number of AMF spores was considered as an indicator of mycorrhiza incidence in soil. Spores were extracted from 0–1, 2–3, 5–7.5, 10–15, 20–30, 40–60 cm soil-depths in agroforestry and monocultural coffee systems, of three different age groups (young, medium-aged and old), using centrifugation methods, and counted. Fine roots were collected and dry-weighed from 0–30 cm in young and old systems and from several depths in medium-aged systems. Soils were characterised with respect to texture, pH, organic matter, calcium, magnesium, phosphorus and potassium. Agroforestry had a higher percentage of spores (12–21% of the total number of spores) and roots (on average 1.5 g L–1 soil) in deeper layers (20–60 cm), and a lower percentage (79–88%) closer to the surface (0–15 cm) than the monocultural fields (respectively 3–12%, 0.6 g L–1 soil and 88–97%). Greater numbers of spores in the deeper soil layers may be explained by greater amounts of roots and may be an indicator of greater incidence of mycorrhiza in agroforestry than in monocultural coffee systems. Greater mycorrhizal incidence at deeper soil layers in the agroforestry system may change the dynamics of phosphorus cycling in soil, making this nutrient more available to plants.
650 _ 4 a| Hongos micorrízicos
650 _ 4 a| Raíces
650 _ 4 a| Sistemas agroforestales
650 _ 4 a| Nutrición de las plantas
650 _ 4 a| Café
651 _ 4 a| Brasil
700 1 _ a| Cardoso, Irene M.
700 1 _ a| Boddington, Claire
e| coaut.
700 1 _ a| Janssen, Bert H.
e| coaut.
700 1 _ a| Oenema, Oene
e| coaut.
700 1 _ a| Kuyper, Thomas W.
e| coaut.
773 0 _
t| Agroforestry Systems
g| Vol. 58, no. 1 (2003), p. 33-43
x| 0167-4366
900 _ _ a| En hemeroteca, SIBE-San Cristóbal
902 _ _ a| MEMP/NGM/GOG
905 _ _ a| Café
905 _ _ a| Servibosques
905 _ _ a| CRIIS
LNG eng
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*En hemeroteca, SIBE-San Cristóbal
Distribution of mycorrhizal fungal spores in soils under agroforestry and monocultural coffee systems in Brazil
Cardoso, Irene M. (autor)
Boddington, Claire (autor)
Janssen, Bert H. (autor)
Oenema, Oene (autor)
Kuyper, Thomas W. (autor)
Contenido en: Agroforestry Systems. Vol. 58, no. 1 (2003), p. 33-43. ISSN: 0167-4366
Bibliotecas:
San Cristóbal
No. de sistema: 31473
Tipo: Artículo
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"Deep-rooting trees in agroforestry systems may promote distribution of spores of arbuscular mycorrhizal fungi (AMF) at deeper soil levels. We investigated the vertical distribution of AMF spores in Oxisols under agroforestry and monocultural (unshaded) coffee systems in on-farm experiments (Brazil). The number of AMF spores was considered as an indicator of mycorrhiza incidence in soil. Spores were extracted from 0–1, 2–3, 5–7.5, 10–15, 20–30, 40–60 cm soil-depths in agroforestry and monocultural coffee systems, of three different age groups (young, medium-aged and old), using centrifugation methods, and counted. Fine roots were collected and dry-weighed from 0–30 cm in young and old systems and from several depths in medium-aged systems. Soils were characterised with respect to texture, pH, organic matter, calcium, magnesium, phosphorus and potassium. Agroforestry had a higher percentage of spores (12–21% of the total number of spores) and roots (on average 1.5 g L–1 soil) in deeper layers (20–60 cm), and a lower percentage (79–88%) closer to the surface (0–15 cm) than the monocultural fields (respectively 3–12%, 0.6 g L–1 soil and 88–97%). Greater numbers of spores in the deeper soil layers may be explained by greater amounts of roots and may be an indicator of greater incidence of mycorrhiza in agroforestry than in monocultural coffee systems. Greater mycorrhizal incidence at deeper soil layers in the agroforestry system may change the dynamics of phosphorus cycling in soil, making this nutrient more available to plants."

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