DOI: 10.1029/2017JG004176
Scopus记录号: 2-s2.0-85049825881
论文题名: Playa-Wetlands Effects on Dryland Biogeochemistry: Space and Time Interactions
作者: McKenna O.P. ; Sala O.E.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 6 起始页码: 1879
结束页码: 1887
语种: 英语
英文关键词: Jornada LTER
; playas
; primary production
; runoff
; sedimentation
; soil nutrients
Scopus关键词: allochthon
; arid region
; autochthon
; biogeochemistry
; carbon fixation
; net primary production
; playa
; research work
; runoff
; sedimentation
; soil carbon
; soil nutrient
; spatiotemporal analysis
; upland region
; wetland
英文摘要: Playas are ephemerally flooded wetlands found in hydrologically closed dryland catchments. Recent research showed how upland-catchment biophysical characteristics control the amount of organic carbon and nutrients that accumulates in playas from upland grasslands and shrublands. Here we further explored the role of allochthonous and autochthonous processes in fixing carbon and accruing soil nutrients in playas across a desert basin. We assessed whether playas contribute soil nutrient, organic-carbon stocks, and primary productivity rates in amounts disproportionately higher or lower than upland grasslands and shrublands. We found that playas had higher soil carbon and nutrient storage but no difference in mean annual primary production. Playas, on average, had similar primary productivity than upland systems, because they exhibited lower productivity during extremely wet years that offset the larger productivity during average or below average precipitation years. These results suggest that playas contain higher carbon and soil nutrient stocks because of runoff-mediated allochthonous inputs, rather than autochthonous sources, since long-term average productivity was similar to upland ecosystems. We also used the precipitation-aboveground net primary production (ANPP) relationships to accurately measure run-on in playas using differences between playa and upland grassland ANPP. The dependence of playa ANPP on surface-water inputs from upland catchments makes them susceptible to future changes in extreme precipitation events. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113795
Appears in Collections: 气候减缓与适应
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作者单位: Global Drylands Center, Arizona State University, Tempe, AZ, United States; School of Life Sciences, Arizona State University, Tempe, AZ, United States; School of Sustainability, Arizona State University, Tempe, AZ, United States
Recommended Citation:
McKenna O.P.,Sala O.E.. Playa-Wetlands Effects on Dryland Biogeochemistry: Space and Time Interactions[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(6)