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在温带生态系统中十年碳流动的驱动因素
Ankur R Desai1, Bailey A Murphy1, Susanne Wiesner2
1Department of Atmospheric and Oceanic Sciences University of Wisconsin-Madison Madison WI USA.
概括
长期的旋转协变流塔揭示了陆地碳循环的变化. 呼吸,而不是光合作用,驱动二氧化碳交换,随着时间的推移,局部干扰会影响流动.
科学领域:
- 生态系统科学 生态系统科学
- 气候科学是气候科学.
- 生物地质化学生物地质化学
背景情况:
- 厄迪共变量流量塔在各种时间尺度上提供关于陆地碳循环动态的关键数据.
- 了解二氧化碳 (CO2) 交换对于气候变化研究至关重要.
研究的目的:
- 评估二氧化碳的净生态系统交换 (NEE) 在上大湖地区的AmeriFlux核心站点多样化的集群中的变化.
- 分析从1997年到2020年的碳流的十年变化和空间异质性.
主要方法:
- 利用来自多个的协变流量塔的数据,包括成熟的森林,湿地和一个高高的景观塔.
- 纳入了来自高密度运动 (CHE3X) 的数据,以评估NEE的空间变化.
- 分析了超过70个站点年的观测,跨越24年.
主要成果:
- 在所有地点观察到十年变化,随着时间的推移,年间NEE的一致性下降.
- 呼吸在NEE变异中扮演的角色比所有地点的光合作用更为重要.
- 降雪量减少和春季延迟的绿化,由于土壤绝缘性较差,影响了碳同化.
- 较高的二氧化碳水平提高了最大净同化,但并没有提高总毛初级生产率.
- 与景观级塔相比,站立规模的站点充当了较大的碳汇.
结论:
- 聚类的,长期的碳流量数据对于理解碳气候相互作用至关重要.
- 当地干扰越来越多地影响了流动时间序列,挑战了扩大规模的努力.
- 该研究强调了陆地碳循环的复杂性和需要进行多层次观测的必要性.
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