| Autor: |
da Rocha Junior PR; Universidade Federal do Espírito Santo, Center of Agrarian Sciences and Engineering - CCAE, Department of Plant Production, Alto Universitário, Gurarema s/n, Alegre, ES, 29500-000, Brazil. rocha.pjunior@gmail.com., Andrade FV; Universidade Federal do Espírito Santo, Center of Agrarian Sciences and Engineering - CCAE, Department of Plant Production, Alto Universitário, Gurarema s/n, Alegre, ES, 29500-000, Brazil., Santos Satiro L; 'Luiz de Queiroz' College of Agriculture, Department of Soil Science, Universidade de São Paulo, 11 Pádua Dias Avenue, Piracicaba, SP, 13418-900, Brazil., Donagemma GK; Empresa Brasileira de Pesquisa Agropecuária, Rua Jardim Botânico 1024, Jardim Botânico, Rio de Janeiro, RJ, 24460-000, Brazil., de Sá Mendonça E; Universidade Federal do Espírito Santo, Center of Agrarian Sciences and Engineering - CCAE, Department of Plant Production, Alto Universitário, Gurarema s/n, Alegre, ES, 29500-000, Brazil. |
| Abstrakt: |
Few studies have shown the importance of different pasture management practices on C storage and the reduction of CO 2 -C emissions in tropical conditions. The objective of the present study was to determine short-term changes in C pools and C balance from different pasture management practices established in the Atlantic Rainforest. A field study was carried out in Alegre, ES, Brazil from September 2013 to August 2014 to investigate the first-year effect of pasture management practices on a Udult clayey soil. The different pasture management practices studied included the following: control (CON), chiseled (CHI), fertilized (FER), burned (BUR), integrated with crop-livestock (iCL) systems, and plowed and harrowed (PH). Monthly disturbed and undisturbed soil samples were taken at two different layers (0.00-0.05 and 0.05-0.20 m) for chemical, physical, and organic matter characterization. C inputs monitored in aboveground pools included plant aerial parts and litter, and belowground pools included roots and soil C stocks. C outputs monitored were CO 2 -C emissions, erosion water, and sediment. C balance was considered the difference between inputs and outputs in each treatment during four seasons. The spring and summer seasons had a strong influence on C inputs and outputs where there is significant difference between spring and summer, while the autumn and winter seasons had less influence. All pasture management practices exhibited positive C balance after 1 year. High values of C balance were verified in pastures fertilized (FER) (53.04 Mg ha -1 year -1 . Intermediate C balance was found in the burned (BUR) (40.84 Mg ha -1 year -1 ), traditional control (CON) (40.31 Mg ha -1 year -1 ), and in the plowing and harrowing (PH) (40.02 Mg ha -1 year -1 ) management practices. The practices of chiseled (40.00 Mg ha -1 year -1 ) and integrated crop-livestock systems (iCL) (59.06 Mg ha -1 year -1 ) resulted in low C balance. |
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