Lesson 32 Mineral Cycling - Alaska Geobotany Center
Lesson 32 Mineral Cycling - Alaska Geobotany Center
Lesson 32 Mineral Cycling - Alaska Geobotany Center
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Soil lysimeter to collect water for chemical<br />
analysis<br />
• Open pit containing partially installed<br />
zero-tension lysimeters.<br />
• Researchers dig a large whole in the<br />
ground and install lysimeter cups into the<br />
uphill side of the pit, as shown here.<br />
Eventually, all the tubing is connected<br />
and the pit is filled back in.<br />
• When it rains, water filters through the<br />
soil (uphill of the pit), enters the cup, and<br />
travels through a tube (dotted line) to a<br />
buried (barely visible) "reservoir," which<br />
collects the sample.<br />
• Approximately once a month technicians<br />
visit these sites and, using a hand pump,<br />
empty the reservoirs using the "sampling<br />
tube." The end of the sampling tube is<br />
the only part of the lysimeter that is<br />
above ground.<br />
Courtesy of Hubbard Brook web page: www.hubbardbrook.org/education/SubjectPages/AcidRainPage.htm
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