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|a 10.2307/4004015
|2 doi
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|a (DE-627)JST051771780
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|a (JST)4004015
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Mycorrhizal Colonization Patterns under Contrasting Grazing and Topographic Conditions in the Flooding Pampa (Argentina)
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|c 2004
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|a Text
|b txt
|2 rdacontent
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|a Computermedien
|b c
|2 rdamedia
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|a Online-Ressource
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|a Arbuscular mycorrhizae (AM) can ameliorate the impact of disturbance on agroecosystem sustainability. The objective of this study was to describe mycorrhizal colonization patterns in contrasting grazing situations (exclosure and continuous grazing) and topographical positions (upland and lowland) in the flooding pampa (Argentina). We determined the mycorrhizal colonization of the community as a whole and of Dallis grass (Paspalum dilatatum Poir.), a highly palatable, dominant species. We characterized colonization by the proportion of root length occupied by fungi and their different structures. At the community level, there was higher total colonization in the grazed area than in the exclosure. In contrast, Dallis grass showed higher total colonization and higher proportion of vesicles and arbuscules in the exclosure than in the grazed area. For both levels, colonization was higher in the lowland than in the upland position. Differences were observed only in winter and spring, not in summer. Our results show that 1) continuous grazing is associated with an increase of mycorrhizal colonization at the community level and 2) community-level patterns of mycorrhizal colonization cannot be inferred from dominant species. To our knowledge, this is the first characterization of AM abundance at the plant community level under contrasting long-term grazing conditions in a subhumid grassland. /// Las micorrizas arbusculares pueden amortiguar el impacto de ciertos disturbios sobre la sustentabilidad de los agroecosistemas. El objetivo de este trabajo fue describir la colonización micorrícica bajo condiciones contrastantes de pastoreo (clausura y pastoreo continuo) y topografía (bajos y planos ligeramente más altos) en la Pampa Deprimida (Argentina). Determinamos la colonizaciœn micorrícica de la comunidad en conjunto y de pasto miel (Paspalum dilatatum Poir.), una especie dominante muy palatable. Caracterizamos la colonización como la proporción de la longitud radical ocupada por hongos micorrícicos y sus diferentes estructuras. A nivel de comunidad, la colonización total fue mayor en el área pastoreada que en la clausurada. En cambio, el pasto miel mostrœ mayor colonización total y proporción de vesículas y arbúsculos en el área clausurada. Para ambos niveles, la colonización fue mayor en la posición topografica baja que en la más alta. Las diferencias fueron encontradas en invierno y primavera, pero no en verano. Los resultados muestran que (1) el pastoreo continuo está asociado a un aumento de la colonizaciœn micorrícica de la comunidad, y (2) los patrones de colonización micorrícica a nivel de comunidad no pueden ser inferidos a partir de una especie dominante. Esta es la primera caracterización de la abundancia de micorrizas arbusculares en la comunidad vegetal en conjunto de pastizales subhúmedos sometidos por varios años a condiciones contrastantes de pastoreo.
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|a Copyright 2004 The Society for Range Management
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|a Vesicular-arbuscular mycorrhizae
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|a Subhumid grassland
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|a Plant community
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|a Dallis grass
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|a Belowground processes
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|a Species interactions
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4 |
|a Physical sciences
|x Earth sciences
|x Geography
|x Geomorphology
|x Topography
|x Highlands
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650 |
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4 |
|a Physical sciences
|x Earth sciences
|x Geography
|x Geomorphology
|x Topography
|x Lowlands
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650 |
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|a Biological sciences
|x Biology
|x Botany
|x Plants
|x Grasses
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650 |
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4 |
|a Biological sciences
|x Agriculture
|x Agricultural sciences
|x Animal science
|x Animal nutrition
|x Animal feeding methods
|x Grazing
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650 |
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4 |
|a Biological sciences
|x Agriculture
|x Agricultural sciences
|x Animal science
|x Animal nutrition
|x Forage and feed science
|x Grazing management
|x Grazing intensity
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650 |
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4 |
|a Biological sciences
|x Biology
|x Botany
|x Plants
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650 |
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4 |
|a Biological sciences
|x Ecology
|x Ecosystems
|x Biomes
|x Grasslands
|x Pampas
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650 |
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4 |
|a Environmental studies
|x Atmospheric sciences
|x Climatology
|x Seasons
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650 |
|
4 |
|a Biological sciences
|x Ecology
|x Population ecology
|x Synecology
|x Biocenosis
|x Plant communities
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650 |
|
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|a Biological sciences
|x Agriculture
|x Agricultural sciences
|x Animal science
|x Animal nutrition
|x Forage and feed science
|x Grazing management
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|a research-article
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700 |
1 |
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|a Oesterheld, Martín
|e verfasserin
|4 aut
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773 |
0 |
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|i Enthalten in
|t Journal of Range Management
|d Society for Range Management, 1948
|g 57(2004), 6, Seite 601-605
|w (DE-627)334373085
|w (DE-600)2057410-1
|x 0022409X
|7 nnns
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1 |
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|g volume:57
|g year:2004
|g number:6
|g pages:601-605
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|u https://www.jstor.org/stable/4004015
|3 Volltext
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|u https://doi.org/10.2307/4004015
|3 Volltext
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|d 57
|j 2004
|e 6
|h 601-605
|