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    • Journal of Range Management, Volume 57 (2004)
    • Journal of Range Management, Volume 57, Number 6 (November 2004)
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    Mycorrhizal Colonization Patterns Under Contrasting Grazing and Topographic Conditions in the Flooding Pampa (Argentina)

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    Author
    Grigera, Gonzalo
    Oesterheld, Martín
    Issue Date
    2004-11-01
    Keywords
    vesicular arbuscular mycorrhizae
    subhumid grassland
    plant community
    Dallis grass
    belowground processes
    species interactions
    
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    Citation
    Grigera, G., & Oesterheld, M. (2004). Mycorrhizal colonization patterns under contrasting grazing and topographic conditions in the flooding pampa (Argentina). Journal of Range Management, 57(6), 601-605.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643213
    DOI
    10.2111/1551-5028(2004)057[0601:MCPUCG]2.0.CO;2
    10.2307/4004015
    10.2458/azu_jrm_v57i6_grigera
    Additional Links
    https://rangelands.org/
    Abstract
    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.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2111/1551-5028(2004)057[0601:MCPUCG]2.0.CO;2
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    Journal of Range Management, Volume 57, Number 6 (November 2004)

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