Land use changes in Southeastern Amazon and trends in rainfall and water yield of the Xingu River during 1976-2015

Autor(es)

Rizzo, Rodnei ^[1] ; Garcia, Andrea S. ^[1] ; Vilela, Vivian M. de F. N. ^[1] ; Ballester, Maria Victoria R. ^[1] ; Neill, Christopher ^[2] ; Victoria, Daniel C. ^[3] ; da Rocha, Humberto R. ^[4] ; Coe, Michael T. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Nucl Energy Agr, Environm Anal & Geoproc Lab, Av Centenario 303, BR-13416000 Piracicaba, SP - Brazil

^[2] Woods Hole Res Ctr, 149 Woods Hole Rd, Falmouth, MA 02540 - USA

^[3] Brazilian Agr Res Corp, Embrapa Agr Informat, BR-13070 Campinas, SP - Brazil

^[4] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Climatic Change; v. 162, n. 3 JUN 2020.
• Citações Web of Science: 0

Resumo

Since the early 1970s, the agricultural frontier of southeastern Amazon has undergone extensive land use changes. These alterations, combined with regional climate changes, have the potential to influence the hydrologic cycle at small to large scales. We evaluated a 40-year time series (1976 to 2015) of rainfall and water yield and related them to land use changes in the Upper Xingu River Basin (UX). We acquired data from six rainfall stations and four river gauges and mapped land use changes. Mann-Kendall trend analysis and Pettitt's change point detection were employed to describe annual and seasonal changes in the time series. Monthly water yield from the Xingu River was used to derive annual, seasonal, and monthly water yield, as well as the runoff coefficient. The largest changes in land use occurred during the last two decades and approximately 60,900 km(2) in the Upper Xingu Basin were deforested between 1985 and 2015. Rainfall in the Xingu Basin decreased by about 245 mm over the period but there was no trend in water yield. The number of rainy days and intensity of events also decreased, but the length of the rainy season and seasonal and annual water yield did not change. Although watershed deforestation has increased water yield in other Amazon rivers, the reduction in rainfall in the Upper Xingu Basin was high enough to mask this effect. (AU)

• Processo FAPESP: 13/50180-5 - Xingu: integrando o planejamento do uso da terra e a governança da água na Amazônia: em busca da melhoria da segurança hídrica na fronteira agrícola do Mato Grosso
• Beneficiário: Alex Vladimir Krusche
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 13/20377-1 - Desenvolvimento do mapa de água virtual da soja na Bacia do Alto Xingu, MT - Brasil
• Beneficiário: Rodnei Rizzo
• Modalidade de apoio: Bolsas no Brasil - Doutorado