Characteristics of soil moisture variation with land-use in the Haean basin of Gangwon province

초록

In this study, we observed the soil moisture with altitude and land use in Haean-myeon, Yanggu-gun, Gangwon-province. For understanding the variation of characteristi0613cs in more details, we installed the automatic monitoring system with depth at apple orchard and ginseng field, which are rapidly expanding in the research area. For automatic soil moisture monitoring and time-series analysis, we installed the soil moisture sensors with depth (10, 20, 40, 70, 100 cm) at two sites (RTA, RTG) and extracted the data from October 19, 2021 to December 20, 2021. In addition, twenty measurement sites (EDN1-10, EDS1-10) were selected to measure soil moisture content with 10 cm in depth with altitude and land use and we conducted the field works every two weeks from February 16, 2022 to April 12, 2022. There was no significant difference in soil moisture content when compared by altitude. However, in the result of comparing soil moisture contents by land use, the median soil moisture contents in potato field was 0.316 m3/m3, which was significantly higher than other land uses. The median of soil moisture content in radish field was 0.139 m3/m3, which was the lowest among the five types of land use. As a result of autocorrelation analysis on soil moisture content in RTA and RTG, both land uses responded rapidly to external influences in the order of depths (10, 40, 20, 100, and 70 cm). As a result of crosscorrelation analysis, the RTA showed the maximum crosscorrelation coefficient of 0.39 when the input factor was temperature, and the RTG showed the maximum crosscorrelation coefficient of 0.48 when the input factor was precipitation. The result of this study is useful to understand the hydrological process that rainfall recharge groundwater through unsaturated zone.

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