| Texto completo | |
| Autor(es): |
Oliveira, P. T. S.
[1, 2]
;
Wendland, E.
[1]
;
Nearing, M. A.
[2]
;
Scott, R. L.
[2]
;
Rosolem, R.
[3]
;
da Rocha, H. R.
[4]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Dept Hydraul & Sanit Engn, BR-13560970 Sao Carlos, SP - Brazil
[2] USDA ARS, Southwest Watershed Res Ctr, Tucson, AZ 85719 - USA
[3] Univ Bristol, Queens Sch Engn, Bristol, Avon - England
[4] Univ Sao Paulo, IAG, Dept Ciencias Atmosfer, Sao Paulo - Brazil
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | HYDROLOGY AND EARTH SYSTEM SCIENCES; v. 19, n. 6, p. 2899-2910, 2015. |
| Citações Web of Science: | 24 |
| Resumo | |
Deforestation of the Brazilian cerrado region has caused major changes in hydrological processes. These changes in water balance components are still poorly understood but are important for making land management decisions in this region. To better understand pre-deforestation conditions, we determined the main components of the water balance for an undisturbed tropical woodland classified as `cerrado sensu stricto denso'. We developed an empirical model to estimate actual evapotranspiration (ET) by using flux tower measurements and vegetation conditions inferred from the enhanced vegetation index and reference evapotranspiration. Canopy interception, throughfall, stemflow, surface runoff, and water table level were assessed from ground measurements. We used data from two cerrado sites, P, de Gigante (PDG) and Instituto Arruda Botelho (IAB). Flux tower data from the PDG site collected from 2001 to 2003 were used to develop the empirical model to estimate ET. The other hydrological processes were measured at the field scale between 2011 and 2014 at the IAB site. The empirical model showed significant agreement (R-2 = 0.73) with observed ET at the daily timescale. The average values of estimated ET at the IAB site ranged from 1.91 to 2.60 mm day(-1) for the dry and wet seasons, respectively. Canopy interception ranged from 4 to 20 % and stemflow values were approximately 1 % of the gross precipitation. The average runoff coefficient was less than 1 %, while cerrado deforestation has the potential to increase that amount up to 20-fold. As relatively little excess water runs off (either by surface water or groundwater), the water storage may be estimated by the difference between precipitation and evapotranspiration. Our results provide benchmark values of water balance dynamics in the undisturbed cerrado that will be useful to evaluate past and future land-cover and land-use changes for this region. (AU) | |
| Processo FAPESP: | 10/18788-5 - Balanço hídrico e erosão do solo em mata nativa do bioma Cerrado |
| Beneficiário: | Paulo Tarso Sanches de Oliveira |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 11/14273-3 - Balanço hídrico e erosão do solo em mata nativa do bioma cerrado |
| Beneficiário: | Luisa Fernanda Ribeiro Reis |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 12/03764-9 - Dinâmica do balanço hídrico e erosão do solo em área de cerrado |
| Beneficiário: | Paulo Tarso Sanches de Oliveira |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |