Seasonal variation of soil moisture in dry dipterocarp forest on sandstone and volcanic rock at Huai Hong Khrai Royal Development Study Center, Chiang Mai Province Thananiti Thichan, Soontorn Khamyong, Niwat Anongrak, Amarin Boontun and Panida Kachina 2020 National Research Online http://doi.nrct.go.th/index.php?page=resolve_doi&resolve_doi=10.14456/kaj.2020.117