近几十年来全球土壤异构呼吸量上升
Ben Bond-Lamberty1, Vanessa L Bailey2, Min Chen3
1Pacific Northwest National Laboratory, Joint Global Change Research Institute at the University of Maryland-College Park, College Park, MD, USA. bondlamberty@pnnl.gov.
Nature
|August 3, 2018
概括
全球土壤呼吸 (Rs) 正在增加,其中越来越多的比例归因于异质呼吸 (Rh). 这表明气候变化正在推动全球土壤的可检测碳损失.
科学领域:
- 土壤科学
- 生态学
- 气候变化研究
背景情况:
- 全球土壤储存大量的碳, 比大气更多.
- 观察到土壤到大气中的二氧化碳 (CO2) 流量增加.
- 关于气候变化对通过异质呼吸 (Rh) 的土壤碳损失的影响存在不确定性.
研究的目的:
- 调查异质呼吸 (Rh) 与土壤总呼吸 (Rs) 的比率的趋势.
- 为全球土壤呼吸动态的变化提供观察证据.
- 评估环境变化对土壤碳储存和释放的影响.
主要方法:
- 使用更新的全球土壤呼吸数据库 (1990-2014).
- 分析了全球原始生产 (GPP) 数据集和太阳引起的光.
- 对净生态系统交换趋势的FLUXNET2015数据进行了审查.
主要成果:
- 在1990年至2014年期间,Rh:Rs比率从0.54增加到0.63.
- 随着时间的推移,Rh和Rs的比率也增加了.
- 在多个全球数据集和模型中观察到一致的Rh上升趋势.
结论:
- 这些发现提供了全球异构呼吸 (Rh) 增加的观察证据.
- 这种趋势表明土壤碳在各种生态系统中持续损失.
- 一个可检测和持续的土壤碳损失趋势正在全球出现.
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