RCCZO -- Nutrient Fluxes, Stream Water Chemistry, Vegetation -- Litter Decomposition in Stream Reaches, Landscapes -- Arizona, USA -- (2010-2014)


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Created: Sep 01, 2020 at 8:22 p.m.
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Abstract

Ephemeral and intermittent streams are increasing with climate and land use changes, and alteration in stream water presence or flow duration will likely affect litter decomposition in channel and riparian zones more than dryland uplands. To investigate the influence of varying climate and stream flow regimes on rates of decomposition, we used a space-for-time substitution design and deployed common leaf litter over an 18-month period across a range of ephemeral to seasonally- intermittent stream reaches (10) and landscape positions (channel, riparian, upland) in Arizona, USA. The monitoring reaches were located in largely undisturbed military facilities, long term ecological research areas and a nature preserve. The most arid study washes, Black Gap (BG) and Sauceda Wash (SW), were located within the Barry M. Goldwater Air Force Base near Gila Bend, Arizona in the Lower Gila River Basin. Nine study sites were located on the Huachuca Mountains near Sierra Vista, Arizona and form part of the San Pedro River Basin. The study sites were located along 3 distinct elevations in 3 canyons: Huachuca Canyon and Garden Canyon which are located within the Fort Huachuca Army Post; and Ramsey Canyon, within the Nature Conservancy’s Ramsey Canyon Preserve (one was later dropped owing to a fire). We established three cross-sectional transects 100 m apart at each reach, except Sauceda and Black Gap Washes where there were 5 transects, and installed electrical resistance sensors (TidbiT v2 UTBI-001 data logger, Onset Corporation, Bourne, MA) at the thalweg of each cross-sectional transect to identify surface water presence frequency and duration. Consistent with expectations, rates of litter decomposition (k) decreased significantly in the channels as cumulative percentage (%) of water presence decreased below 40%. Indeed, differences in cumulative duration of water presence as well as channel bed material silt content explained 79% of the variation in k across flow regimes. Collectively, our findings suggest that rates of decomposition in intermittent stream channels will decrease with reduced duration of stream flow and water presence whereas rates in riparian zones will be less responsive to changes in climate and associated subsidies of stream flow.

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Resource Level Coverage

Spatial

Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
North Latitude
37.0101°
East Longitude
-109.1613°
South Latitude
31.3805°
West Longitude
-114.5666°

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Additional Metadata

Name Value
DOI 10.18122/boisestate/reynoldscreek/18
Recommended Citation Lohse, Kathleen A.; Gallo, Erika L.; and Meixner, Thomas. (2020). Dataset on Rates of In-situ Litter Decomposition across a Range of Ephemeral to Seasonally-Intermittent Stream Reaches and Landscape Positions in Arizona, USA [Data set]. Retrieved from 10.18122/boisestate/reynoldscreek/18
BSU ScholarWorks Link https://scholarworks.boisestate.edu/reynoldscreek/18/

Credits

Funding Agencies

This resource was created using funding from the following sources:
Agency Name Award Title Award Number
Department of Defense Strategic Environmental Research and Development Program RC-1726

How to Cite

Lohse, K. A., E. L. Gallo, T. Meixner, C. Reynolds (2020). RCCZO -- Nutrient Fluxes, Stream Water Chemistry, Vegetation -- Litter Decomposition in Stream Reaches, Landscapes -- Arizona, USA -- (2010-2014), HydroShare, http://www.hydroshare.org/resource/2f5fc96b1a434b6f9b31dca3022d6aac

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 http://creativecommons.org/licenses/by/4.0/
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