Resumen de Precipitación Neta e Intercepción en un Bosque Adulto de Pinus radiata (D.Don.)

Anton Huber J, Carlos E. Oyarzún

• español

  Se estudió la redistribución de las precipitacione s en un bosqu e adult o de Pinus radiata, en las cercanía s de la ciudad de Valdivia (Chile). Las precipitacione s que alcanzaron el suelo en forma directa fueron recogidas mediant e un a canaleta metálica, mientra s que el agua de escurrimiento fustal fue captada con collares especiales ubicados alrededor de los troncos. La precipitación interceptad a por las copa s y tronco s alcanzó a un promedi o anual de 10,3 % . El agua que llegó a la superficie del suelo del bosqu e está constitu í d a en un 87 % por precipitación directa y 13 % por escurrimiento fustal. Estos valores fluctuaron mensualment e dependiend o de las características de las precipitaciones.

• English

  The monthly , seasonal and annual distribution of the interception, net precipitation, throughfall and stemflow was studied in an adult forest of plantation Pinus radiata, in the proximity of Valdivia (Chile) during 1981 - 1982 . The rainfall tha t reached the soil by throughfall were collected by means of a metalic channel, while wate r of stemflow was collected with special collars placed around the stems. The rainfall intercepted by the crowns and stems reached an annual average of 10.3 % . T h e wate r tha t reached the surface of the forest soil is constituted in a 8 7 % by throughfall and 1 3 % by stemflow. These values fluctuated monthl y depending on the rainfall characteristics. The interception decreases to values lower than 10 % whe n the precipitation reach values over 40 mm. It was established that aproximately 0.9 mm of rain are necessary to saturat e the capacity of wate r retention of the crowns. Besides, it was determined thar the stemflow manisfest itself after 6 mm of precipitation, which is a quantity necessary to saturat e with wate r the stem barks. Regression equation were calculated for net precipitation, throughfall and stemflow on a weekly basis.