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 of land‐use change, and compared to a less seasonal central Amazon forest. In both forests, vapour from transpiration was responsible 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 atmosphere 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 transpiration and evaporation.
Boletim Amazônia em Pauta 8 – 10 razões para o desmatamento zero ilegal e legal na Amazônia
Boletim Amazônia em Pauta 8 – 10 razões para o desmatamento zero ilegal e legal na Amazônia
No que se refere à redução do desmatamento amazônico e de suas emissões associadas, a meta estabelecida precisa urgentemente ser cumprida muito antes de 2030, e mais: deve-se buscar o fim da supressão legal da vegetação nativa da região. Neste boletim são citadas as dez principais razões para colocar fim à destruição da maior floresta tropical do planeta.