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Assessment of Water Loss Patterns with Microlysimeters¹

It is difficult to measure the distribution of evapotranspiration(ET) in the field because of mixed soil types, moisture regime, and vegetation. Portable, cylindrical, grass-growing lysimeters were constructed and used to obtain distribution patterns of evapotranspiration. The objective of the study was to develop a practical method of evaluating ET in the field. The microlysimeters were laboratory and field checked and the final study was carried out on a 58-ha watershed. Laboratory check showed that at high soil water contents periodic removal of lysimeters for weighing did not destroy the continuity of flow. The field check demonstrated feasibility of field use and showed no significant diferences in ET between different segments of a small study area. The watershed study in addition to microlysimeter observations, included gamma-probe measurements and ET predictions with an ET model. Except for a very stony and a wooded site ET estimates obtained by the three methods appeared satisfactory.

Key Words: Lysimeter • Evapotranspiration • Watershed ET-model • Soil-water

² Soil scientist, USDA-ARS, Northeast Watershed Res. Ctr., University Park, Penn.; and hydrologic technician, USDA-ARS, Northeast Watershed Res. Ctr., Klingerstown, Penn.

Received for publication February 26, 1976.