I have soil columns containing isotope enriched gases (N2O, CO2)
in the soil profile. This soil column is going to be wetted up,
resulting in a moving water front containing dissolved gases. I want
to take small discrete samples of the water from the wetting front
without causing major disruption to it or the dissolved gases.  This
rules out suction sampling devices I think. One idea is to bury
small, concave vessels in the soil column that should passively
collect water and could be immediately siphoned off to exetainers.
Any ideas would be greatly appreciated.

Tim Clough.

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Dr Tim Clough,
Research Scientist,
Soil, Plant and Ecological Sciences Division,
Soil and Physical Sciences Group,
P O Box 84,
Lincoln University,
Canterbury,
New Zealand.

Phone: (64) (3) 325 2811
Fax:  (64) (3) 325 3607