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首页> 外文期刊>oecologia >Water flux through a semi-deciduous forest grove of the Orinoco savannas
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Water flux through a semi-deciduous forest grove of the Orinoco savannas

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摘要

Water relations were analysed in a semi-deciduous forest grove occurring in the oxisols of the Orinoco savannas. This grove has a shallow unconsolidated ironstone cuirass, which is overlaid by a sandy loam layer (0.0–0.5 m) that contains more than 90 of the grove forest root phytomass. Evapotranspiration and through drainage were calculated by using data from the soil profile as related to physical characteristics of the site root zone, hydraulic conductivity, volumetric water content and potential hydraulic gradient. Mean annual evapotranspiration was 783 mm year−1and annual through drainage below the root zone was 14 (162 mm year−1) of the gross rainfall. This drainage recharged the 42 of the annual saturation deficit of the water table. Similar mean annual evapotranspiration (770 mm year−1) was also calculated by using the water balance components. The mean daily coupling omega factor (Ω) between the grove canopy and the surrounding atmosphere indicated that a high degree of coupling (Ω=0.14±0.16) occurs in the grove and evapotranspiration was mainly controlled by surface conductance. As the dry season proceeded, the soil saturation deficit (δθ) increased rapidly resulting in a threshold surface conductance (0.030–0.005 m s−1) for δθ ranging from 0.05 to 0.10. Hypotheses to explain the omnipresence of perennial species in the wide range of physical conditions in neotropical sava

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  • 来源
    《oecologia》 |1995年第2期|141-150|共页
  • 作者

    JoséJ.San José; RubenA.Montes; AdrianaFlorentino;

  • 作者单位

    Instituto Venezolano de Investigaciones Científicas;

    Universidad Simón Bolívar;

    Universidad Central de Venezuela;

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  • 正文语种 英语
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