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Measurement of dew, fog, and rime with a high‐precision gravitation lysimeter
Author(s) -
Meissner Ralph,
Seeger Juliane,
Rupp Holger,
Seyfarth Manfred,
Borg Heinz
Publication year - 2007
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/jpln.200625002
Subject(s) - lysimeter , environmental science , dew , evapotranspiration , hydrology (agriculture) , water balance , water table , soil science , water content , soil water , meteorology , geology , groundwater , geotechnical engineering , ecology , physics , biology , condensation
Exact information about soil water flow is needed to quantify solute transfer within the unsaturated zone. Water flux densities are often measured indirectly, e.g. , with water‐balance, water content–change, or tracer methods, and, therefore, often predicted with notable uncertainties. Over the last years, direct lysimetry methods have been increasingly used to study water and solute migration in soil profiles. A large weighable lysimeter is the best method to obtain reliable drainage data, but it requires relatively high investment and maintenance expenses. To reduce cost and improve comparability with undisturbed sites, a new technology to collect large monolithic soil columns with a surface area of 0.5–2 m 2 and a depth of 1–3 m as well as a containerized polyethylene (PE‐HD) lysimeter station were developed. In addition, the station was fitted with a new high‐precision weighing technique. In this paper, the latter is demonstrated with data from a newly constructed gravitation lysimeter. Besides recording rainfall and seepage, its weighing precision makes it possible to register mass input by dew, fog, or rime. It also permits a very accurate calculation of actual evapotranspiration. Because this new type of lysimeter allows a very high temporal resolution, it is ideally suited to develop and test models for soil hydrologic processes.