文章基本信息

标题：Completing the FACE of elevated CO2 research
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作者：Alan G. Jones ; Alan G. Jones ; John Scullion 等
期刊名称：Environment International
印刷版ISSN：0160-4120
电子版ISSN：1873-6750
出版年度：2014
卷号：73
页码：252-258
DOI：10.1016/j.envint.2014.07.021
语种：English
出版社：Pergamon
摘要：Abstract We appraise the present geographical extent and inherent knowledge limits, following two decades of research on elevated CO2 responses in plant communities, and ask whether such research has answered the key question in quantifying the limits of compensatory CO2 uptake in the major biomes. Our synthesis of all ecosystem-scale (between 10m2 and 3000m2 total experimental plot area) elevated CO2 (eCO2) experiments in natural ecosystems conducted worldwide since 1987 (n =151) demonstrates that the locations of these eCO2 experiments have been spatially biased, targeting primarily the temperate ecosystems of northern America and Europe. We consider the consequences, suggesting fundamentally that this limits the capacity of the research to understand how the world's major plant communities will respond to eCO2. Most notably, our synthesis shows that this research lacks understanding of impacts on tropical forests and boreal regions, which are potentially the most significant biomes for C sink and storage activity, respectively. Using a meta-analysis of the available data across all biomes, we show equivocal increases in net primary productivity (NPP) from eCO2 studies, suggesting that global validation is needed, especially in the most important biomes for C processing. Further, our meta-analysis identifies that few research programs have addressed eCO2 effects on below-ground C storage, such that at the global scale, no overall responses are discernable. Given the disparity highlighted in the distribution of eCO2 experiments globally, we suggest opportunities for newly-industrialized or developing nations to become involved in further research, particularly as these countries host some of the most important regions for tropical or sub-tropical forest systems. Modeling approaches that thus far have attempted to understand the biological response to eCO2 are constrained with respect to collective predictions, suggesting that further work is needed, which will link models to in situ eCO2 experiments, in order to understand how the world's most important regions for terrestrial C uptake and storage will respond to a future eCO2 atmosphere. Highlights • Limits to understanding following two decades' elevated CO2 (eCO2) research are examined. • A bias in the global distribution of plant community eCO2 experiments is demonstrated. • The implications via global metrics for carbon dynamics are considered. • Whether limited experimental lengths and soil carbon analyses have been inadequate is examined. • New collaborative frameworks for experiments in carbon dense regions are proposed.
关键词：Elevated; CO2; Ecosystem; Carbon; Sequestration;