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Attempts to determine the effects of forest cover on stream flow by direct hydrological measurements in Los Negros, Bolivia

Domaine de recherche: Uncategorized Année: 2009
Type de publication: Article Mots-clés: Payments for environmental services; Hydrology; Monitoring; BoliviaECOSYSTEM SERVICES; PAYMENTS
  • V. LeTellier
  • A. Carrasco
  • N. Asquith
Journal: Forest Ecology and Management Volume: 258
Nombre: 9 Pages: 1881-1888
ISI Document Delivery No.: 510MS Times Cited: 1 Cited Reference Count: 25
Underlying many payments for watershed services (PWS) schemes in tropical montane forest contexts is the assumption of a direct positive relationship between forest cover and city season stream flow. We developed a low cost research program to assess the forest cover-stream flow relationship in the Los Negros watershed in eastern Bolivia. We asked three questions: (I) can watersheds that are similar enough to undertake paired catchment studies be identified using only simple parameters such as size, aspect and geographic proximity; (2)cana functioning locally based hydrological monitoring system be set up for less than $10000 by training local farmers to collect hydrological data, and (3)can such data be used to improve the functioning of a PWS initiative? A land use map of the tipper Los Negros valley was created from a 2005 Landsat image and a digital elevation model used to calculate physical and hydrological properties of 10 sub-watersheds Farmers measured stream flow rates in these sub-watersheds from 2005 to 2008 and maintained 10 automatic rain gauges. We found no relationship between forest cover and stream flow. This may indicate that no such relationship exists, but could also reflect the short period of the study, the low quality of the data, and the fact that the sub-watersheds had relatively similar forest coverage (54-76%). We conclude that (1) watersheds can be identified as "similar-enough-for-analysis" using the criteria of size. aspect and proximity without undertaking further research, (2) a useful hydrological monitoring system can be developed for