Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.3390/soilsystems3010006 |
| Environmental and Vegetative Controls on Soil CO2 Efflux in Three Semiarid Ecosystems | |
| Roby, Matthew C.; Scott, Russell L.; Barron-Gafford, Greg A.; Hamerlynck, Erik P.; Moore, David J. P. | |
| 通讯作者 | Scott, RL |
| 来源期刊 | SOIL SYSTEMS
 |
| EISSN | 2571-8789 |
| 出版年 | 2019 |
| 卷号 | 3期号:1 |
| 英文摘要 | Soil CO2 efflux (F-soil) is a major component of the ecosystem carbon balance. Globally expansive semiarid ecosystems have been shown to influence the trend and interannual variability of the terrestrial carbon sink. Modeling F-soil in water-limited ecosystems remains relatively difficult due to high spatial and temporal variability associated with dynamics in moisture availability and biological activity. Measurements of the processes underlying variability in F-soil can help evaluate F-soil models for water-limited ecosystems. Here we combine automated soil chamber and flux tower data with models to investigate how soil temperature (T-s), soil moisture (theta), and gross ecosystem photosynthesis (GEP) control F-soil in semiarid ecosystems with similar climates and different vegetation types. Across grassland, shrubland, and savanna sites, theta regulated the relationship between F-soil and T-s, and GEP influenced F-soil magnitude. Thus, the combination of T-s, theta, and GEP controlled rates and patterns of F-soil. In a root exclusion experiment at the grassland, we found that growing season autotrophic respiration accounted for 45% of F-soil. Our modeling results indicate that a combination of T-s, theta, and GEP terms is required to model spatial and temporal dynamics in F-soil, particularly in deeper-rooted shrublands and savannas where coupling between GEP and shallow theta is weaker than in grasslands. Together, these results highlight that including theta and GEP in F-soil models can help reduce uncertainty in semiarid ecosystem carbon dynamics. |
| 英文关键词 | soil respiration drylands water availability spatial variation temporal dynamics pulses photosynthesis ecosystem respiration |
| 类型 | Article |
| 语种 | 英语 |
| 开放获取类型 | Green Published, Other Gold |
| 收录类别 | ESCI |
| WOS记录号 | WOS:000500757400006 |
| WOS关键词 | HETEROTROPHIC RESPIRATION ; PRECIPITATION PULSES ; TEMPERATURE SENSITIVITY ; SONORAN DESERT ; CARBON BALANCE ; CLIMATE-CHANGE ; HIGH-ELEVATION ; PHOTOSYNTHESIS ; MOISTURE ; WATER |
| 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/2XILL650/333966 |
| 作者单位 | [Roby, Matthew C.; Moore, David J. P.] Univ Arizona, Sch Nat Resources & Environm, Tucson, AZ 85721 USA; [Roby, Matthew C.; Scott, Russell L.] USDA ARS, Southwest Watershed Res Ctr, Tucson, AZ 85719 USA; [Barron-Gafford, Greg A.] Univ Arizona, Sch Geog & Dev, Tucson, AZ 85721 USA; [Barron-Gafford, Greg A.] Univ Arizona, Coll Sci, Biosphere 2, Tucson, AZ 85721 USA; [Hamerlynck, Erik P.] USDA ARS, Eastern Oregon Agr Res Ctr, Burns, OR 97720 USA |
| 推荐引用方式 GB/T 7714 | Roby, Matthew C.,Scott, Russell L.,Barron-Gafford, Greg A.,et al. Environmental and Vegetative Controls on Soil CO2 Efflux in Three Semiarid Ecosystems[J]. University of Arizona,2019,3(1). |
| APA | Roby, Matthew C.,Scott, Russell L.,Barron-Gafford, Greg A.,Hamerlynck, Erik P.,&Moore, David J. P..(2019).Environmental and Vegetative Controls on Soil CO2 Efflux in Three Semiarid Ecosystems.SOIL SYSTEMS,3(1). |
| MLA | Roby, Matthew C.,et al."Environmental and Vegetative Controls on Soil CO2 Efflux in Three Semiarid Ecosystems".SOIL SYSTEMS 3.1(2019). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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