Table 2. Areal Density and Total Salt Mass Estimates for the Crust, Substrate, and Nearby Soils on Beaches and Dunes Around Alkali Lakea


Salt Repository	Area (m2)	Areal Salt Mass Density (kgmiddotm-2)	Total Salt Mass (kg)	Equivalent Solute Concentration (gmiddotL-1)

Lake water	4.9 middot 105	NA	1.3 middot 107	53
Crust	3.3 middot 105	1.3 +/- 0.2	4.4 middot 105	NA
Substrate	3.3 middot 105	1.9 +/- 0.4b	6.3 middot 105	167 +/- 63c
Soil (average)	5.2 middot 106	0.028b	1.5 middot 105	1.7d
Soil (background)	NA	0.012 +/- 0.008b	NA	0.7d
Annual groundwater inseepage	4.9 middot 105	NA	5.9 middot 104	0.2

aAlso shown are total salt mass values for the lake water and annual groundwater inseepage.
bSalt mass in the samples was measured to a depth of 3.8 cm.
cEquivalent solute concentration in substrate was estimated using a porosity of 30 +/- 5%.
dEquivalent solute concentration in dune soil was estimated using a porosity of 43 +/- 5%.