Warming temperatures lead to reduced summer carbon sequestration in the U.S. Corn Belt
Warming temperatures lead to reduced summer carbon sequestration in the U.S. Corn Belt
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DOI：
10.1038/s43247-021-00123-9
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发表时间：
2021-03
影响因子：
7.9
通讯作者：
Zhongjie Yu;T. Griffis;J. Baker
中科院分区：
文献类型：
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作者：
Zhongjie Yu;T. Griffis;J. Baker
中纬度北部高产农田对气候变化的反应是全球碳循环不确定性的主要来源，也是对未来粮食生产的关切。我们提供了在美国玉米带一座非常高的塔上测量的每小时二氧化碳浓度的十年时间序列(2007至2019年)。对这一记录的分析以及该区域的其他长期数据表明，气候变暖对作物生长早期的二氧化碳净吸收产生了积极影响，但在生长旺季减少了农田和自然生态系统的二氧化碳净吸收。未来夏季气温的升高预计将使玉米地带每年的二氧化碳固存减少10-20%。这些发现突出了气候变暖对农田二氧化碳交换和作物产量的动态控制，并挑战了气候变暖将继续有利于中纬度北部生态系统二氧化碳封存的范式。
The response of highly productive croplands at northern mid-latitudes to climate change is a primary source of uncertainty in the global carbon cycle, and a concern for future food production. We present a decadal time series (2007 to 2019) of hourly CO2concentration measured at a very tall tower in the United States Corn Belt. Analyses of this record, with other long-term data in the region, reveal that warming has had a positive impact on net CO2uptake during the early crop growth stage, but has reduced net CO2uptake in both croplands and natural ecosystems during the peak growing season. Future increase in summer temperature is projected to reduce annual CO2sequestration in the Corn Belt by 10–20%. These findings highlight the dynamic control of warming on cropland CO2exchange and crop yields and challenge the paradigm that warming will continue to favor CO2sequestration in northern mid-latitude ecosystems.