Event-based hydrology and sedimentation in paired watersheds under commercial eucalyptus and grasslands in the Brazilian Pampa biome  

作　　者：Ederson Diniz Ebling Jose Miguel Reichert Jhon Jairo Zuluaga Pelaez Miriam Fernanda Rodrigues Mirian Lago Valente Rosane Barbosa Lopes Cavalcante Paolo Reggiani Raghavan Srinivasan 

机构地区：[1]Soils Department,Universidade Federal de Santa Maria,Avenida Roraima,1000 Bairro Camobi,Santa Maria,RS,97105-900,Brazil [2]Corporacion Colombiana de Investigacion Agropecuaria(AGROSAVIA),Centro de Investigacion Nataima,Espinal,Colombia [3]CMPC Celulose Riograndense,Rua Sao Geraldo,1680,Guaiba,RS,92500-000,Brazil [4]Department of Civil Engineering,University of Siegen,Paul Bonatz Strasse 9-11,Siegen D,57068,Germany [5]Department of Ecology and Conservation Biology,Texas A&M University(TAMU),534 John Kimbrough Blvd.,Room 305,College Station,TX,77843-2120,USA [6]Current address:Instituto Tecnologico Vale.Rua Boaventura da Silva,955,Umarizal,Belem,PA,Brazil.

出　　处：《International Soil and Water Conservation Research》2021年第2期180-194,共15页国际水土保持研究（英文）

基　　金：This study was financed in part by the“Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior”(CAPES)-Finance Code 001;Fapergs(“Fundacao de Amparoa Pesquisa do Estado do Rio Grande do Sul”);CMPC Celulose Riograndense.JMR thanks CNPq(Brazilian Council for Scientific and Technological Development)for the research fellowship.

摘　　要：Ecological and hydrological impacts are expected when watersheds are under commercial eucalyptus.In this study we evaluated event-based hydrology and sedimentation in paired watersheds under commercial eucalyptus and grasslands cover.Flow,suspended sediment concentration,and sediment production were measured and simulated with the Limburg Soil Erosion Model(LISEM)in paired hydrographic watersheds located in southern Brazil;one occupied with 7-years old Eucalyptus saligna plantation(forest watershed-FW;0.83 km^(2))and another Pampa biome with native and exotic grasses used for beef cattle production(grassland watershed-GW;1.10 km^(2)).The effect of rainfall on hydrological and sedimentological variables was more evident in GW compared with FW.The shape of the hydrograph was steepest in GW,with rapid,marked increase and decrease in flow during rainfall.The parameters changed for model calibration in FW and GW were soil saturated hydraulic conductivity,initial soil moisture,and Manning roughness coefficient,whereby the statistical performance was classified as good(NSE>0.75).Fourteen events different from those used in the calibration process were validated for FW and GW,with NSE index classified as“good”and“very good”for hydrology.Our study shows limitations of LISEM in calibrating and validating the sediment yield for individual events due to the spatial variability of factors controlling soil erosion.The validated modeling results of this study may be applied in simulating soil and crop scenarios in watersheds cultivated with commercial forest and grassland for grazing.

关 键 词：Southern grasslands Paired watersheds RUNOFF Erosion LISEM 

分 类 号：P33[天文地球—水文科学]