Contribution of transpiration to forest ambient vapour based on isotopic measurements

M. Z. Moreira, Leonel Sternberg, L. A. Martinelli, R. L. Victoria, E. M. Barbosa, L. C M Bonates, D. C. Nepstad

Research output: Chapter in Book/Report/Conference proceedingChapter

151 Scopus citations


Using a simple isotope mixing model, we evaluated the relative proportion of water vapour generated by plant transpiration and by soil evaporation at two sites in the Amazon basin. Sampling was carried out at two different soil covers (forest and pasture), in a seasonal tropical rainforest at eastern Amazon where major deforestation is the result land-use change, and compared to a less seasonal central Aamzon forest. In both forests, vapour from transpiration was repsonsible for most, if not all, of the water vapour generated in the forest, while it could not be detected above the grassy pastures. Thus the canopy transpiration may be a major source of water vapour to the forest and perhaps to the atmospehre during the dry season. The results are discussed in relation to predictive models based on net radiation that usually are not able to distinguish between transpriation and evaporation.

Original languageEnglish
Title of host publicationGlobal Change Biology
Number of pages12
StatePublished - Dec 1 1997

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)
  • Ecology
  • Environmental Chemistry
  • Global and Planetary Change


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