Erosion-induced carbon redistribution, burial and mineralisation — Is the episodic nature of erosion processes important?

摘要: Abstract There is still an ongoing scientific discussion regarding the importance of erosion-induced lateral soil organic carbon (SOC) redistribution for burial and/or mineralisation and resulting long-term C balance at catchment scale. Especially effects event driven nature water erosion potentially associated enrichment SOC in sediment delivery are unclear. In general, two processes lead to SOC: (i) due selective interrill sites, (ii) depletion deposition sites. this study, conceptual turnover model SPEROS-C was adapted integrate these applied a small arable (4.2 ha) Germany 57-year period. A total number 901 runs were performed with different realisations frequency magnitude as well ratios taken from literature compared reference run representing mean annual without processes. our modelling study indicates that ignoring temporal variability may substantial misinterpretation fluxes. vertical flux (difference between inputs plant assimilates fertilizer mineralisation) sites strongly depends on parameterisation ranging maximum source − 336 g C m− 2 sink 44 g C m− 2. combination substantially higher export processes, overall turns into − 44 g C m− 2 end simulation period − 1 g C m− 2 run.