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Water-Dispersible Colloids

Effects of Measurement Method, Clay Content, Initial Soil Matric Potential, and Wetting Rate

^a Environmental Engineering Section, Dep. of Life Sciences, Aalborg University, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark
^b Dep. of Agroecology, Danish Institute of Agricultural Sciences, P.O. Box 50, DK-8830 Tjele, Denmark

View larger version (38K): [in a new window]   Fig. 1. Map of the sampling area at Lerbjerg with contours of soil clay content. The designations L1 to L6 refer to sampling locations.

View larger version (32K): [in a new window]   Fig. 2. Pretreatment procedures for measurement of low-energy water-dispersible colloids (LE-WDC) as a function of initial matric potential (IMP) and wetting rate.

View larger version (17K): [in a new window]   Fig. 3. Amount of (a) high-energy water-dispersible colloids (HE-WDC) as a function of clay content, and (b) low-energy water-dispersible colloids (LE-WDC) as a function of clay content and initial matric potential (IMP). Error bars: ±SE.

View larger version (14K): [in a new window]   Fig. 4. Percentage of water-stable aggregates (WSA) in fractions >0.25 and >4 mm as a function of clay content. Error bars: ±SE.

View larger version (17K): [in a new window]   Fig. 5. Regression plot between water-stable aggregates (WSA) and low-energy water-dispersible colloids (LE-WDC) at IMP –2.5 hPa. Error bars: ±SE.

View larger version (20K): [in a new window]   Fig. 6. Amount of low-energy water-dispersible colloids (LE-WDC) as a function of time and initial matric potential (IMP) at 11.5% clay. Error bars: ±SE.

View larger version (21K): [in a new window]   Fig. 7. Effect of wetting rate on (a) volume change after fast infiltration as a function of clay content and initial matric potential (IMP), and (b) amount of low-energy water-dispersible colloids (LE-WDC) at –15500 hPa as a function of clay content.