Abstract

RAMOS HERNANDEZ, César Gerardo et al. Water losses from rainfall interception in a fragment of a mixed forest in the state of Durango. Rev. mex. de cienc. forestales [online]. 2024, vol.15, n.83, pp.55-79.  Epub Aug 02, 2024. ISSN 2007-1132.  https://doi.org/10.29298/rmcf.v15i83.1443.

In order to understand the hydrological properties of a fragment of mixed forest in the state of Durango, Mexico, an experiment was carried out during the 2017-2020 period. The distribution and flow of rainwater incident rainfall, direct rainfall and stemflow, were quantified in order to assess the interception losses and the physical and chemical properties of the water. 77 events with an accumulation of 2 236.1 mm of rainfall were evaluated. Direct rainfall in Pinus durangensis, P. engelmannii, and P. teocote amounted to 72.4, 71.9, and 70.4 %, respectively. The rainfall that trickled down through the canopy showed an acceptable relationship with respect to incident rainfall, with average values of 0.83 of the Coefficient of Determination (R 2 ); the stemflow was 0.41 for P. durangensis, 0.40 for P. engelmannii, and 0.46 % for P. teocote, with an average R 2 of 0.47 and a greater variation. The interception losses were 27, 28, and 29 %, respectively, with an R 2 ranging between 0.35, for P. teocote, and 0.44 for P. engelmannii. The pH of throughfall was 5.9 for incident rainfall, 5.0 for the direct rainfall, and 4.1 for stemflow. Electrical conductivity evidenced a chemical change in the water composition, with 32.4 μS cm-1 values for incident rainfall, 39.0 μS cm-1 for direct rainfall and 75.0 μS cm-1 for stemflow. The hydrological properties of the three species of conifers do not exhibit variation in terms of the various pathways of redistribution of rainfall.

Keywords : Stemflow; interception; throughfall; rainfall; physiochemical properties; hydrological properties.

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