Large, Monolithic, Weighing Lysimetersby Arland D. Schneider, USDA-ARS, Bushland, United States,
Terry A. Howell, USDA-ARS, Bushland, United States,
Abstract: Monolithic lysimeters preserve existing vegetation and soil properties that can be destroyed by excavation and filling. Site preparation for constructing large, monolithic lysimeters includes operations such as wetting or drying the soil, preserving vegetation, preventing soil compaction and installing anchors for pulldown operations. Large soil monoliths are collected by coring from the top, by encasing soil blocks from the side and by compositing smaller soil monoliths within a soil tank. Soil monoliths can be under-cut with steel plates that later become the soil tank bottom, or they can be lifted and overturned for installation of the tank bottom. Enclosure tanks for monolithic lysimeters are preferably installed with minimum excavation to eliminate large areas of disturbed soil around the lysimeter.
Subject Headings: Measuring instruments | Construction sites | Compacted soils | Concrete blocks | Vegetation | Soil properties | Excavation | Steel plates
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