Impact of rainfed and irrigated agriculture systems on soil carbon stock under different climate scenarios in the semi-arid region of Brazil

作     者：André L CARVALHO Renato A ARAúJO-NETO Guilherme B LYRA Carlos E P CERRI Stoécio M F MAIA AndréL CARVALHO;Renato A ARAúJO-NETO;Guilherme B LYRA;Carlos E P CERRI;Stoécio M F MAIA

作者机构：Center for Agrarian SciencesFederal University of AlagoasRio Largo 57072-900Brazil Luiz de Queiroz College of AgricultureThe University of Sao PauloPiracicaba 13418-900Brazil Federal Institute of AlagoasMarechal Deodoro 57160-000Brazil 

出 版 物：《Journal of Arid Land》 (干旱区科学（英文版）)

年 卷 期：2022年第14卷第4期

页      面：359-373页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：supported by the the National Council for Scientific and Technological Development of Brazil and Ministry of Science,Technology,Innovation(MCTI)of Brazil(383697/2015-8) Brazilian Research Network on Global Climate Change(Rede Clima),which provided the scholarship to Renato Américo ARAúJO-NETO 

主　　题：soil carbon stock agriculture systems climate scenarios Century model semi-arid region 

摘      要：Understanding the dynamics of soil organic carbon(SOC) is of fundamental importance in land use and management, whether in the current researches or in future scenarios of agriculture systems considering climate change. In order to evaluate SOC stock of the three districts(Delmiro Gouveia, Pariconha, and Inhapi districts) in the semi-arid region of Brazil in rainfed and irrigated agriculture systems under different climate scenarios using the Century model, we obtained RCP4.5 and RCP8.5 climate scenarios derived from the Eta Regional Climate Model(Eta-Had GEM2-ES and Eta-MIROC5) from the National Institute for Space Research, and then input the data of bulk density, p H, soil texture, maximum temperature, minimum temperature, and rainfall into the soil and climate files of the Century model. The results of this study showed that the Eta-Had GEM2-ES model was effective in estimating air temperature in the future period. In rainfed agriculture system, SOC stock under the baseline scenario was lower than that under RCP4.5 and RCP8.5 climate scenarios, while in irrigated agriculture system, SOC stock in the almost all climate scenarios(RCP4.5 and RCP8.5) and models(Eta-Had GEM2-ES and Eta-MIROC5) will increase by 2100. The results of this study will help producers in the semi-arid region of Brazil adopt specific agriculture systems aimed at mitigating greenhouse gas emissions.