Bhattarai Mukesh Dev, Secchi Silvia, Schoof Justin
Southern Illinois University Carbondale, Illinois, USA.
Environ Manage. 2017 Jan;59(1):77-86. doi: 10.1007/s00267-016-0771-6. Epub 2016 Oct 11.
Land-based carbon sequestration constitutes a major low cost and immediately viable option in climate change mitigation. Using downscaled data from eight atmosphere-ocean general circulation models for a simulation period between 2015 and 2099, we examine the carbon sequestration potential of alternative agricultural land uses in an intensively farmed Corn Belt watershed and the impact of climate change on crop yields. Our results show that switching from conventional tillage continuous corn to no-till corn-soybean can sequester the equivalent of 192.1 MtCO eq of soil organic carbon per hectare with a sequestration rate of 2.26 MtCO eq ha yr. Our results also indicate that switchgrass can sequester the equivalent of 310.7 MtCO eq of soil organic carbon per hectare with a sequestration rate of 3.65 MtCO eq ha yr. Our findings suggest that, unlike for corn and soybean yields, climate change does not have a significant effect on switchgrass yields, possibly due to the carbon fertilization effect.
陆地碳封存是缓解气候变化的一种主要低成本且立即可行的选择。利用八个大气 - 海洋通用环流模型的降尺度数据，对2015年至2099年的模拟期进行研究，我们考察了集约化种植的玉米带流域替代农业土地利用方式的碳封存潜力以及气候变化对作物产量的影响。我们的结果表明，从传统耕作的连作玉米转换为免耕玉米 - 大豆，每公顷可封存相当于192.1 MtCO₂当量的土壤有机碳，封存速率为2.26 MtCO₂当量/公顷·年。我们的结果还表明，柳枝稷每公顷可封存相当于310.7 MtCO₂当量的土壤有机碳，封存速率为3.65 MtCO₂当量/公顷·年。我们的研究结果表明，与玉米和大豆产量不同，气候变化对柳枝稷产量没有显著影响，这可能是由于碳施肥效应。
