Resumo

HUBER J, ANTON  e  TRECAMAN V, RAMIRO. Water-use efficiency for Pinus radiata stands in Chile. Bosque (Valdivia) [online]. 2004, vol.25, n.3, pp.33-43. ISSN 0717-9200.  http://dx.doi.org/10.4067/S0717-92002004000300004.

The water-use efficiency of Pinus radiata, D. Don stands in Chile was determined. The transpiration rate (net evapotranspiration / tree volumetric increase) of selected plantations with different management between the Seventh and Tenth regions of Chile were calculated. Transpiration rate ranged between 241 and 717 m³/ m³. The smaller transpiration rate was registered in zones containing soils with a high water retention, heavy rainfall and little vegetation. The greatest rates of transpiration were determined in the plantations established in zones with less intense precipitation and a high potential evaporation. The transpiration rate was also high in sandy soils because here the trees are exposed to a prolonged water stress which restricts their growth. Precipitation, net precipitation, density of the stand, soil-water retention capacity, summer temperature, and the characteristics of the vegetation explain more than 83.8% (r²) of the variability in the transpiration rate between the studied plantations.

Palavras-chave : transpiration rate; Pinus radiata.

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