Forested water catchments in a changing environment

摘要: In the past, headwater catchments have often been studied to elucidate effect of forests on water cycle. This has interest since centuries and we recall here this historical context. We review quantitative effects found in numerous studies around world, especially those from paired-catchment experiments. As a rule, they indicate lower yield compared shorter vegetation types, which can be explained by their high evapotranspiration. Discharge peaks are thereby less affected type than low flows, while erosion is prevented other permanent soil cover. The quality obtained forested high, average better under land-uses. mainly result inputs pollutants rather an active cleaning. future, cycle will change regional global scale because three ongoing processes: land-use changes, climatic changes deposition pollutants. Long-term monitoring continue help us understanding such changes. many cases, however, single disturbances like windstorm, fire or pest outbreaks more impact progressive Especially regard, experiments remain powerful tool assess environmental at large enough account for interactions.