Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/ecs2.2315 |
Biocrust contribution to ecosystem carbon fluxes varies along an elevational gradient | |
Dettweiler-Robinson, Eva; Nuanez, Michelle; Litvak, Marcy E. | |
通讯作者 | Dettweiler-Robinson, Eva |
来源期刊 | ECOSPHERE
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ISSN | 2150-8925 |
出版年 | 2018 |
卷号 | 9期号:6 |
英文摘要 | Understanding how each component of an ecosystem contributes to carbon fluxes across a range of abiotic conditions enables accurate forecasts for future emission scenarios. In drylands, biological soil crust (biocrust) contribution to ecosystem carbon fluxes may vary at a regional scale but is rarely quantified due to the difficulty of parameterizing process-based models or parsing biocrust (on the soil surface) from whole-soil flux measurements. We measured excised biocrust carbon fluxes across current and future predicted warmer summertime temperatures from dryland sites (grassland, shrubland, savanna, and woodland) and compared those to the ecosystem and soil fluxes from eddy flux towers. Overall, biocrust fluxes showed net carbon loss during the warm growing season temperatures, suggesting that cool-season photosynthesis is likely critical for maintaining positive biocrust carbon balance in these sites. Biocrust flux temperature responses differed by site: Grassland and shrubland biocrust gross photosynthesis was relatively invariant, while respiration increased with temperature; in the woodland and savanna, biocrust gross photosynthesis and respiration increased with temperature. Biocrust fluxes contributed <3% to the observed ecosystem gross primary productivity at 26 degrees C and ecosystem respiration at 19 degrees C in grassland, shrubland, and woodland, but contributed >10% of observed soil respiration in grassland and shrubland at 19 degrees C, reinforcing the need to separate biocrust activity from root and subsurface heterotroph activity to understand drivers of fluxes at different sites. Regional resolution of biocrust type and cover will improve predictions of biocrust contribution to global carbon flux with changing temperatures. |
英文关键词 | biological soil crust drylands ecosystem carbon exchange eddy flux covariance soil respiration |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000439997600027 |
WOS关键词 | BIOLOGICAL SOIL CRUSTS ; SEMIARID ECOSYSTEMS ; CO2 EXCHANGE ; DESERT ; TEMPERATURE ; RESPIRATION ; VARIABILITY ; RESPONSES ; MOISTURE ; PHOTOSYNTHESIS |
WOS类目 | Ecology |
WOS研究方向 | Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/208841 |
作者单位 | Univ New Mexico, Dept Biol, MSCO3 2020,1, Albuquerque, NM 87131 USA |
推荐引用方式 GB/T 7714 | Dettweiler-Robinson, Eva,Nuanez, Michelle,Litvak, Marcy E.. Biocrust contribution to ecosystem carbon fluxes varies along an elevational gradient[J],2018,9(6). |
APA | Dettweiler-Robinson, Eva,Nuanez, Michelle,&Litvak, Marcy E..(2018).Biocrust contribution to ecosystem carbon fluxes varies along an elevational gradient.ECOSPHERE,9(6). |
MLA | Dettweiler-Robinson, Eva,et al."Biocrust contribution to ecosystem carbon fluxes varies along an elevational gradient".ECOSPHERE 9.6(2018). |
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