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    • Journal of Range Management, Volume 51 (1998)
    • Journal of Range Management, Volume 51, Number 6 (November 1998)
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    Long term dynamics of 2 populations of Prosopis caldenia Burkart

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    Author
    Dussart, E.
    Lerner, P.
    Peinetti, R.
    Issue Date
    1998-11-01
    Keywords
    landscape ecology
    Prosopis
    savanna woodlands
    ecological succession
    population dynamics
    rain
    shrubs
    sheep
    cattle
    Argentina
    grazing
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    Citation
    Dussart, E., Lerner, P., & Peinetti, R. (1998). Long term dynamics of 2 populations of Prosopis caldenia Burkart. Journal of Range Management, 51(6), 685-691.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643978
    DOI
    10.2307/4003613
    Additional Links
    https://rangelands.org/
    Abstract
    Invasion of pristine grasslands by caldén (Prosopis caldenia Burkart), and increased densities of this species in savannas are well-known vegetation changes in the semiarid region of central Argentina although little is known about its rates and patterns. In this paper we studied the relationship between dynamics of 2 representative P. caldenia populations and factors that could control the invasion process such as range management, fire events and precipitation regimes. Rates of implantation and spatial patterns are quantified using the present age distribution and dendroecological techniques. The pristine landscapes of the 2 study sites were grassland plains with (Site 2) and without trees (Site 1). The present density of the caldén is 586 and 1,259 shrubs/ha in Site 1 and 2, respectively. No evidence of clustering was found at the spatial scale of the study (p = 0.52, Site 1 and p = 0.08, Site 2 for n = 112). The ages of sampled individuals ranged from 3 to 65 years in site 1 and 8 to 55 years in Site 2 (only trees with diameter lower than 30 cm were sampled in Site 2). The importance of cattle as an effective disperser of caldén seeds was confirmed, as changes in measured establishment rates coincided fairly well with changes in cattle management. Establishment rates during the period of sheep grazing were 0.99 plant/ha/yr (16 years) in Site 1 and 10 plant/ha/yr (15 years) in Site 2. However, 10 years after the introduction of cattle these values reach 12.7 plant/ha/yr and 48.5 plant/ha/yr, respectively. One fire event occurred at each site (1980 in Site 1 and 1964 at Site 2). This factor did not change the density trend at Site 1, and at Site 2 it coincided with cattle introduction and caused an impressive increase in tree establishment. Fire was not an effective means of controlling P. caldenia populations. No relationship was found between population dynamics and available precipitation data.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003613
    Scopus Count
    Collections
    Journal of Range Management, Volume 51, Number 6 (November 1998)

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