must be taken with a quadrat Vegetation measured using a line-intercept transect of 30m Random number (1-20) selection
out of a plastic bag Estimate center of hill for starting point Soil moisture sample taken at 15m mark of
transects 2 &204 10 m 10 m 10
m m * Haphazard slope selection * Throw a rock to
determine starting point o flats 20 m 20 m
Soil crust thickness taken at 10m & Starting height randomly generated
Transects Line-Intercept Method Calculating percent vegetation cover Vegetatio n Cover = Length covered by
vegetation Length of transect Quadrats Determining Soil Moisture Content Weigh out 200g of soil Baked soil
Weigh baked soil Use (Wa - Wb)/Wa Results Question: What is the relationship between soil crust thickness on shrub cover?
p>0.10 R^2=0.0013 B A A
p<0.01 B B A p<0.01
A B B p=0.001
Interpretation Average soil crust thickness v. Aspect: Flash floods and annual crust disturbance Water content v. Aspect: Largest particles stay in wash Low retention
Shrub coverage v. Aspect: Vegetation capitalization Connections to Other Research 0.1
R^2=0.098 Ram et. al 2006 suggest that
thicker soil crusts decrease plant available moisture Soil Crusts and Climate Change Red areas indicate high C fixation from Cryptobiotic crusts L.G. Sancho et al.
Thank You! Citations Ram, Almog, and Yair Aaron. Negative and Positive Effects of Topsoil Biological Crusts on Water Availability along a Rainfall Gradient in a Sandy Arid Area. CATENA 70, no. 3 (August 1, 2007): 43742. doi:10.1016/j.catena.2006.11.012.
Zhang, Yuanming, Asa L. Aradottir, Marcelo Serpe, and Bertrand Boeken. Interactions of Biological Soil Crusts with Vascular Plants. In Biological Soil Crusts: An Organizing Principle in Drylands, edited by Bettina Weber, Burkhard Bdel, and Jayne Belnap, 226:385406. Cham: Springer International Publishing, 2016. doi:10.1007/978-3-319-30214-0_19.
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