Häkkinen, Miira---Simolin, ToniTampere UniversityResearcher-Santaoja, MinnaTampere UniversityUniversity Lecturer, Experienced researcher, University Researcher, Senior Lecturer, Project researc...-Chen, Ping---Viskari, TiaFinnish Institute for Health and Welfare, Tampere UniversityVisiting Researcher, Doctoral Researcher, Grant Researcherphysical activity, mental health, school, children, adolescentsDomisch, TimoNatural Resources Institute Finland (Luke)-carbon fluxes, decomposition, ecology, forest soil, tree roots, wood antsYu, JunlinUniversity of HelsinkiAcademy Research Fellow, Postdoctoral Researcher-Lahti, LeoUniversity of TurkuAssociate Professor-Postareff, Liisa---Elsilä, LauriUniversity of HelsinkiDoctoral researcher-