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    • Journal of Range Management, Volume 49 (1996)
    • Journal of Range Management, Volume 49, Number 2 (March 1996)
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    Soil nutrients and salinity after long-term grazing exclusion in a flooding Pampa grassland

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    Author
    Chaneton, E. J.
    Lavado, R. S.
    Issue Date
    1996-03-01
    Keywords
    flood meadows
    submergence
    inorganic phosphorus
    soil organic matter
    electrical conductivity
    site factors
    ratios
    grasslands
    soil salinity
    soil fertility
    forbs
    grazing intensity
    plant communities
    soil chemistry
    Argentina
    botanical composition
    grasses
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    Citation
    Chaneton, E. J., & Lavado, R. S. (1996). Soil nutrients and salinity after long-term grazing exclusion in a flooding Pampa grassland. Journal of Range Management, 49(2), 182-187.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644329
    DOI
    10.2307/4002692
    Additional Links
    https://rangelands.org/
    Abstract
    Soil organic C, total N, extractable P, and salinity were evaluated after 12-16 years of protection from grazing in 2 native grassland sites which differed in frequency of soil waterlogging in the Flooding Pampa of Argentina. We tested the hypothesis that flooding regime would affect the impact of grazing on soil chemical properties. We sampled soil to 10-cm depth in adjacent grazed and ungrazed plots in each site, and assessed the percentage dissimilarity (PD) in vegetation composition among pastures. Grazing condition significantly interacted with site (p<0.001) in affecting topsoil C, N, and salinity. Soil C and N were higher in grazed grassland (C = 4.8%; N = 0.42%) than in long-term exclosure (C = 3.7%; N = 0.35%) for the more frequently flooded, lowland site, hut did not vary between grassland plots in the upland site (C = 3.1%; N = 0.29%). Soil electrical conductivity (E.C.) was low in both ungrazed plots (< 2 dS/m), yet in grazed condition salinization was higher in the upland (E.C.= 6.85 dS/m) than in the lowland site (3.88 dS/m). Soil extractable P did not change in any consistent way with grazing treatment. Grazing apparently amplified differences in soil chemistry between lowland and upland sites, while differences in botanical composition between topographical positions were smaller for grazed (PD = 44 %) than for ungrazed (64 %) grassland. Moreover, contrasting responses between sites occurred for various soil parameters, whereas compositional differences between grazed and ungrazed plots were similar in each site (PD = 65%). Thus, soil-vegetation changes in response to grazing appeared to be loosely coupled in this rangeland ecosystem
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002692
    Scopus Count
    Collections
    Journal of Range Management, Volume 49, Number 2 (March 1996)

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