The role of South American grazing lands in mitigating greenhouse gas emissions. A reply to: 'Reassessing the role of grazing lands in carbon-balance estimations: Meta-analysis and review', by Viglizzo et al., (2019)

摘要

We conclude that the major flaws described above, in addition to the other listed concerns, invalidate the C sequestration rates estimated by Viglizzo et al. (2019). Thus, their main conclusion that C accrual in grassland soils can offset greenhouse gas emissions from rural plus non-rural sectors of MERCOSUR region is not valid. We agree with them in that IPCC Tier 1 methodologies for national inventories in the region have shortcomings, including that some grazing lands are probably not in steady state. However, we argue that the proposed revised method does not improve our understanding of carbon balances.