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http://dx.doi.org/10.7745/KJSSF.2017.50.5.336

Interpreting in situ Soil Water Characteristics Curve under Different Paddy Soil Types Using Undisturbed Lysimeter with Soil Sensor  

Seo, Mijin (National Institute of Environmental Research)
Han, Kyunghwa (National Institute of Agricultural Sciences)
Cho, Heerae (National Institute of Agricultural Sciences)
Ok, Junghun (National Institute of Agricultural Sciences)
Zhang, Yongseon (National Institute of Agricultural Sciences)
Seo, Youngho (Gangwon Agricultural Research & Extension Services)
Jung, Kangho (National Institute of Agricultural Sciences)
Lee, Hyubsung (National Institute of Agricultural Sciences)
Kim, Gisun (National Institute of Agricultural Sciences)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.50, no.5, 2017 , pp. 336-344 More about this Journal
Abstract
The soil water characteristics curve (SWCC) represents the relation between soil water potential and soil water content. The shape and range of SWCC according to the relation could vary depending on soil characteristics. The objective of the study was to estimate SWCC depending on soil types and layers and to analyze the trend among them. To accomplish this goal, the unsaturated three soils were considered: silty clay loam, loam, and sandy loam soils. Weighable lysimeters were used for exactly measuring soil water content and soil water potential. Two fitting models, van Genuchten and Campbell, were applied. Two models entirely fitted well the measured SWCC, indicating low RMSE and high $R^2$ values. However, the large difference between the measured and the estimated was found at the 30 cm layer of the silty clay loam soil, and the gap was wider as soil water potential increased. In addition, the non-linear decrease of soil water content according to the increase of soil water potential tended to be more distinct in the sandy loam soil and at the 10 cm layer than in the silty clay loam soil and at the lower layers. These might be seen due to the various factors such as not only pore size distribution, but also cracks by high clay content and plow pan layers by compaction. This study clearly showed difficulty in the estimation of SWCC by such kind of factors.
Keywords
SWCC; Weighable lysimeter; Fitting model; Soil types; Soil layers;
Citations & Related Records
Times Cited By KSCI : 13  (Citation Analysis)
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