Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.3390/soilsystems3010010 |
| Reconciling Negative Soil CO2 Fluxes: Insights from a Large-Scale Experimental Hillslope | |
| Cueva, Alejandro; Volkmann, Till H. M.; van Haren, Joost; Troch, Peter A.; Meredith, Laura K. | |
| 通讯作者 | Cueva, A |
| 来源期刊 | SOIL SYSTEMS
 |
| EISSN | 2571-8789 |
| 出版年 | 2019 |
| 卷号 | 3期号:1 |
| 英文摘要 | Soil fluxes of CO2 (F-s) have long been considered unidirectional, reflecting the predominant roles of metabolic activity by microbes and roots in ecosystem carbon cycling. Nonetheless, there is a growing body of evidence that non-biological processes in soils can outcompete biological ones, pivoting soils from a net source to sink of CO2, as evident mainly in hot and cold deserts with alkaline soils. Widespread reporting of unidirectional fluxes may lead to misrepresentation of F-s in process-based models and lead to errors in estimates of local to global carbon balances. In this study, we investigate the variability and environmental controls of F-s in a large-scale, vegetation-free, and highly instrumented hillslope located within the Biosphere 2 facility, where the main carbon sink is driven by carbonate weathering. We found that the hillslope soils were persistent sinks of CO2 comparable to natural desert shrublands, with an average rate of -0.15 +/- 0.06 mu mol CO2 m(2) s(-1) and annual sink of -56.8 +/- 22.7 g C m(-2) y(-1). Furthermore, higher uptake rates (more negative F-s) were observed at night, coinciding with strong soil-air temperature gradients and [CO2] inversions in the soil profile, consistent with carbonate weathering. Our results confirm previous studies that reported negative values of F-s in hot and cold deserts around the globe and suggest that negative F-s are more common than previously assumed. This is particularly important as negative F-s may occur widely in arid and semiarid ecosystems, which play a dominant role in the interannual variability of the terrestrial carbon cycle. This study contributes to the growing recognition of the prevalence of negative F-s as an important yet, often overlooked component of ecosystem C cycling. |
| 英文关键词 | net soil exchange biosphere 2 carbonate weathering negative emission technology microbial induced carbonate precipitation |
| 类型 | Article |
| 语种 | 英语 |
| 开放获取类型 | DOAJ Gold, Green Published |
| 收录类别 | ESCI |
| WOS记录号 | WOS:000500757400009 |
| WOS关键词 | CARBON-DIOXIDE EMISSIONS ; NET ECOSYSTEM EXCHANGE ; EDDY COVARIANCE ; HETEROTROPHIC RESPIRATION ; TEMPERATURE-DEPENDENCE ; INTERANNUAL VARIABILITY ; SEMIARID ECOSYSTEMS ; WEATHERING RATE ; RAIN PULSES ; EFFLUX |
| WOS类目 | Soil Science |
| WOS研究方向 | Agriculture |
| 来源机构 | University of Arizona |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/333967 |
| 作者单位 | [Cueva, Alejandro; Volkmann, Till H. M.; van Haren, Joost; Troch, Peter A.; Meredith, Laura K.] Univ Arizona, Biosphere 2, Tucson, AZ 85623 USA; [van Haren, Joost] Univ Arizona, Honors Coll, Tucson, AZ 85721 USA; [Troch, Peter A.] Univ Arizona, Dept Hydrol & Atmospher Sci, Tucson, AZ 85721 USA; [Meredith, Laura K.] Univ Arizona, Sch Nat Resources & Environm, Tucson, AZ 85721 USA |
| 推荐引用方式 GB/T 7714 | Cueva, Alejandro,Volkmann, Till H. M.,van Haren, Joost,et al. Reconciling Negative Soil CO2 Fluxes: Insights from a Large-Scale Experimental Hillslope[J]. University of Arizona,2019,3(1). |
| APA | Cueva, Alejandro,Volkmann, Till H. M.,van Haren, Joost,Troch, Peter A.,&Meredith, Laura K..(2019).Reconciling Negative Soil CO2 Fluxes: Insights from a Large-Scale Experimental Hillslope.SOIL SYSTEMS,3(1). |
| MLA | Cueva, Alejandro,et al."Reconciling Negative Soil CO2 Fluxes: Insights from a Large-Scale Experimental Hillslope".SOIL SYSTEMS 3.1(2019). |
| 条目包含的文件 | 条目无相关文件。 | |||||
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
