Datasets produced by Multiscale Impacts of Cyanobacterial Crusts on Landscape Stability (1/6) (NERC grant NE/K011464/1)
Data from laboratory experiments conducted as part of project NE/K011464/1 (associated with NE/K011626/1) Multiscale Impacts of Cyanobacterial Crusts on Landscape stability. Soils were collected from two sites in eastern Australia and transferred to a laboratory at Griffith University, Queensland for conduct of experiments. Soils were A, a sandy loam, and B a loamy fine sand. Trays 120 mm x 1200 mm x 50 mm were filled with untreated soil that contained a natural population of biota. Soils were either used immediately for experiments (physical soil crust only: PC) or were placed in a greenhouse and spray irrigated until a cyanobacterial crust has grown from the natural biota. Growth was for a period of 5 days (SS), c.30 days (MS2) or c.60 days (MS1). Following the growing period (if applicable) trays were placed in a temperature/humidity controlled room at 35° and 30% humidity until soil moisture (measured 5 mm below the surface) was 5%. Trays were then subject to rainfall simulation. Rainfall intensity of 60 mm hr-1 was used and rainfall was applied for 2 minutes (achieving 2 mm application), 8 minutes (achieving 8 mm application) or 15 minutes (achieving 15 mm application). Following rainfall, trays were returned to the temperature/humidity-controlled room under UV lighting until soil moisture at 5 mm below the surface was 5%. A wind tunnel was then placed on top of each tray in turn and a sequential series of wind velocities (5, 7, 8.5, 10, 12 m s-1) applied each for one minute duration. On each tray the five wind velocities were run without saltation providing a cumulative dust flux. For the highest wind speed, an additional simulation run was conducted with the injection of saltation sands. Three replicates of each rainfall treatment were made. Variables measured include photographs, spectral reflectance, surface roughness, fluorescence, penetrometry, chlorophyll content, extracellular polysaccharide content, Carbon, Nitrogen and splash erosion and particle-size analysis (of wind eroded material). Details of rainfall simulator, growth of cyanobacteria, laser soil surface roughness characterisation and wind tunnel design and deployment in Strong et al., 2016; Bullard et al. 2018, 2019. Bullard, J.E., Ockelford, A., Strong, C.L., Aubault, H. 2018a. Impact of multi-day rainfall events on surface roughness and physical crusting of very fine soils. Geoderma, 313, 181-192. doi: 10.1016/j.geoderma.2017.10.038. Bullard, J.E., Ockelford, A., Strong, C.L., Aubault, H. 2018b. Effects of cyanobacterial soil crusts on surface roughness and splash erosion. Journal of Geophysical Research – Biogeosciences. doi: 10.1029/2018. Strong, C.S., Leys, J.F., Raupach, M.R., Bullard, J.E., Aubault, H.A., Butler, H.J., McTainsh, G.H. 2016. Development and testing of a micro wind tunnel for on-site wind erosion simulations. Environmental Fluid Mechanics, 16, 1065-1083.
nonGeographicDataset
https://www.bgs.ac.uk/services/ngdc/accessions/index.html#item126992
function: download
http://data.bgs.ac.uk/id/dataHolding/13607455
eng
geoscientificInformation
publication
2008-06-01
Bacteria
NGDC Deposited Data
Wind erosion
Rainfall
Soils
revision
2022
NERC_DDC
2014-03-17
2019-04-07
creation
2019-04-08
notApplicable
Soil A is a sandy loam, soil B is a loamy fine sand and the biota of both soils is dominated by cyanobacteria (28%) (detailed in Bullard et al. 2018b). Biological soil crusts were grown in a greenhouse for 5, 30 or 60 days and spray irrigated with filtered water (equiv. 2 mm rainfall per day). Rainfall was simulated using the Griffith University Mobile Rainfall simulator detailed in Bullard et al. 2018a. Soil surface topography was determined using a Micro-Epsilon ScanCONTROL 2900-100 laser profiler, scanner height was 24 cm above the soil surface and used to scan an area of 100 x 100 mm at a resolution of 0.078 mm (detailed in Bullard et al. 2018a). The trays were proportioned to fit exactly beneath the Micro Wind Tunnel with perimeter seals to avoid air leakage. Details of the wind tunnel development and testing are in Strong et al. 2016.
publication
2011
false
See the referenced specification
publication
2010-12-08
false
See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
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Department of Geography
University of Loughborough
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British Geological Survey
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2025-04-06