The influence of sugarcane crop development on rainfall interception losses

Autor(es)

Fernandes, Rafael Pires ; da Costa Silva, Robson Willians ; Salemi, Luiz Felippe ; Berteli de Andrade, Tatiana Morgan ; de Moraes, Jorge Marcos ; van Dijk, Albert I. J. M. ; Martinelli, Luiz Antonio

• Tipo de documento: Artigo Científico
• Fonte: Journal of Hydrology; v. 551, p. 8-pg., 2017-08-01.

Resumo

The expansion of sugarcane plantations in Brazil has raised concerns regarding its hydrological impacts. One of these impacts is related to rainfall interception, which can be expected to vary in response to substantial changes in canopy structure throughout the cropping cycle. We collected field measurements to determine interception losses and interpreted the observations using an adapted Gash model during different stages of a sugarcane ratoon cropping cycle. Cumulative gross rainfall (PG), throughfall (TF) and stemflow (SF) were measured biweekly, along with vegetation structure measurements of leaf area index (LAI) and plant height. For the first 300 days after the first harvest, the cumulative PG of 1095 mm was partitioned into 635 mm TF (58%) and 263 mm SF (24%). The inferred interception loss (I-L) was 263 mm (24%). There was a gradual and clear increase in I-L from 3% to 46% while partitioning between TF and SF also changed during ratoon regrowth. After model parameter optimisation, observed I-L was simulated satisfactorily. Model estimates suggested that evaporation from the saturated canopy is the main I-L pathway, followed by evaporation after storms. Plant architecture, LAI and meteorological conditions during the cropping cycle appeared the main factors determining I-L. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/15695-9 - Fluxos hidrológicos e de nitrogênio em vertentes de uma microbacia coberta por cana-de-açúcar
• Beneficiário: Rafael Pires Fernandes
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 13/09283-5 - Modelagem da redistribuição da chuva pela copa da cana-de-açúcar
• Beneficiário: Rafael Pires Fernandes
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Mestrado
• Processo FAPESP: 10/20256-1 - Hidrologia e dinâmica do nitrogênio e do carbono em microbacias com cobertura de cana-de-açúcar
• Beneficiário: Jorge Marcos de Moraes
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/51226-0 - Processos hidrologicos e transporte de nitrogenio e carbono em bacias com cobertura de cana-de-acucar e floresta estacional semidecidual.
• Beneficiário: Robson Willians da Costa Silva
• Modalidade de apoio: Bolsas no Brasil - Doutorado