Arid
DOI10.1002/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
ISSN2150-8925
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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