Climate change impact on soil salt accumulation in khon kaen, northeast thailand

Koshi Yoshida, Supranee Sritumboon, Mallika Srisutham, Koki Homma, Masayasu Maki, Kazuo Oki

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)


    In northeast Thailand, 17% of the total agricultural land is classified as salt-affected. In the future, climate change may exacerbate salt-affected soil problems. Therefore, in this study, we conducted a field survey to evaluate seasonal changes in soil electrical conductivity (ECe) in salt-affected paddy areas of Ban Phai District, Khon Kaen Province, northeast Thailand. Fifteen soil samples were collected every 2 weeks from October 2016 to December 2018, and the ECe, soil water content, and soil textures were ana-lyzed. Then, the HYDRUS-1D model was applied to esti-mate seasonal changes in the salinity level, and the simu-lated results corresponded well with observed data. Using HYDRUS-1D and the global circulation model (MIROC5) outputs under the Representative Concentration Pathways 8.5 scenario, future ECe was predicted. Under a tempera-ture increase of 2.8°C from 2016 to 2100, annual potential evapotranspiration increased from 1,430 mm (2016–2025) to 1,584 mm (2081–2100). The average ECe in cultivation season increased from 2.63 dS/m (2016–2025) to 3.31 dS/m (2081–2100). As a countermeasure to mitigate soil salt accumulation, a 5 cm reduction in groundwater level offsets the negative impact of climate change, and a 10 cm reduction significantly improves the soil ECe rela-tive to the current soil salinity level.

    Original languageEnglish
    Pages (from-to)92-97
    Number of pages6
    JournalHydrological Research Letters
    Issue number4
    Publication statusPublished - 2021


    • Climate change
    • HYDRUS-1D
    • Paddy rice
    • Salt affected soil
    • Thailand

    ASJC Scopus subject areas

    • Water Science and Technology
    • Earth and Planetary Sciences (miscellaneous)


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