DOI: 10.5194/hess-19-2899-2015
Scopus记录号: 2-s2.0-84934945686
论文题名: The water balance components of undisturbed tropical woodlands in the Brazilian cerrado
作者: Oliveira P ; T ; S ; , Wendland E ; , Nearing M ; A ; , Scott R ; L ; , Rosolem R ; , Da Rocha H ; R
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2015
卷: 19, 期: 6 起始页码: 2899
结束页码: 2910
语种: 英语
Scopus关键词: Deforestation
; Digital storage
; Evapotranspiration
; Groundwater
; Land use
; Runoff
; Surface waters
; Water supply
; Actual evapotranspiration
; Enhanced vegetation index
; Ground measurements
; Hydrological process
; Reference evapotranspiration
; Runoff coefficients
; Vegetation condition
; Water balance components
; Vegetation
; cerrado
; deforestation
; evapotranspiration
; hydrological modeling
; interception
; land use change
; timescale
; tropical region
; water budget
; woodland
; Brazil
英文摘要: 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, Pé 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 (R2 = 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. © Author(s) 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78486
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Hydraulics and Sanitary Engineering, University of São Paulo, CxP. 359, São Carlos, SP, Brazil; USDA-ARS, Southwest Watershed Research Center, 2000 E. Allen Rd., Tucson, AZ, United States; Queens School of Engineering, University of Bristol, Bristol, United Kingdom; Departamento de Ciências Atmosféricas, IAG, Universidade de São Paulo, Sao Paulo, Brazil
Recommended Citation:
Oliveira P,T,S,et al. The water balance components of undisturbed tropical woodlands in the Brazilian cerrado[J]. Hydrology and Earth System Sciences,2015-01-01,19(6)