Seeing the forest not for the carbon: why concentrating on land-use-induced carbon stock changes of soils in Brazil can be climate-unfriendly

Springer Science and Business Media LLC - Tập 18 - Trang 63-75 - 2016
Jens Boy1, Simone Strey1, Regine Schönenberg2, Robert Strey1, Oscarlina Weber-Santos3, Claas Nendel4, Michael Klingler5, Charlotte Schumann2, Korbinian Hartberger2, Georg Guggenberger1
1Institute of Soil Science, Leibniz Universität Hannover, Hanover, Germany
2Lateinamerika Institut (LAI), Freie Universität Berlin, Berlin, Germany
3Departamento de Solos e Engenharia Rural, Universidade Federal do Mato Grosso – UFMT/FAMEV, Cuiabá, Brazil
4Institut für Landschaftssystemanalyse, Leibniz-Zentrum für Agrarlandschaftsforschung (ZALF), Müncheberg, Germany
5Geographisches Institut, Universität Innsbruck, Innsbruck, Austria

Tóm tắt

Soil carbon stocks of 29 plots along a transect through tropical Brazil showed only minor soil carbon losses after land use shift, although replacement of forest-derived carbon was detectable in subsoil and topsoil, indicating that new equilibria in soil carbon stocks might not have been reached after deforestation. The proportion of carbon lost from soils was negligible as compared to the emissions from biomass reduction by deforestation itself. Industrial agriculture had the best ratio between food production and carbon loss, pointing toward a potential reduction of deforestation pressure by further agricultural intensification, which is not achieved in practice due to institutional obstacles and uneven benefit sharing. In contrast, farmers at the agricultural frontier were identified as change agents if alternative sustainable land uses, taking advantage of biodiversity-related ecosystem services, are fostered by better access to credit lines and extension management. Thus, constraining the climate change debate in agriculture to sole management of carbon stock changes in soil is misleading and draws the attention from the most urgent problems: deforestation caused by wrong incentives.

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