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  http://www.elmundo.es/suplementos/cronica/2007/584

  Calculation method to obtain the water
  consumption in forestal species.

  Prieto's equation for the real
  evapotranspiration.

  Antonio Manuel Estévez Prieto
  January 26, 2007

  Introduction

  I've developed a calculation method to obtain, with precision, the water consumption of any forestal species, and with it elaborate a simple mathematical formula, valid to anyone of the aforementioned species.

  Comparing the numerical constant obtained from applying the formula to a given species of tree, measured in liters of water per day of consumption,with pluviometric data measured in the nearest meteorological station one can determine the compatibility of a certain species with the geographical niche in which it is planned to be implanted. This measurement is independent of possible local humidity sources or of what is called horizontal rain.

  The knowledge of the supportability threshold, in terms of a hydric deficit,is a growing urgency in the present time. Such a knowledge would allow an optimal selection of species to replant a certain area, and would help avoiding mistakes applying the main technique we have to stop the climatic change, the desertification and desertization: forestal repopulation, which also conveys sole fixation by means of the rooting of the radicular system.

  Aim

  Disentangling wasteful plants from others that can manage water consumption in a more efficient way in order to apply to repopulation, forraging, gardening or research always the most convenient species, so to cope with the growing scarceness of water resources, be it for antropogenic or natural causes.

  With a simple mathematical formula and the ratio that from it results,along with the maintenance of isolated species, it is possible to assign a specific category to each plant, to denote the economy in the consumption of resources that the species can develop, with optimal results on growing quality and fructification.

  Prieto's equation:

  E =A/M/P·3.5t·1/H·(V + 1)·S

  Where:

  • E represents the evapotranspiration.
    
  • A measures the water supply.
    
  • M is the foliar surface.
    
  • P symbolizes time.
    
  • T stands for temperature.
    
  • H is the relative humidity.
    
  • V accounts for the wind speed.
    
  • S denotes the tipe of soil.

  Epilogue

  Thanks Mr. Branson, thanks for you good feelings.

  I,m not intresting in the money, only in the earth and the nature conservation, but thank you very much Sir.

  And remember: Only the forestry repoblation can stop at CO2 and climatic change.

  Antonio Manuel Estévez Prieto
  Energy, Conservation Nature and Envyroment Technic of Ourense (Galicia - Spain) Provintial Diputation
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