Title Page
Contents
ABSTRACT 9
Ⅰ. Introduction 11
Ⅱ. Methods and Materials 15
2.1. Study site 15
2.2. Measurement of environmental factors 18
2.3. Soil analysis 19
Ⅲ. Results and Discussion 21
3.1. Photosynthetic photon flux density(µmol) 21
3.2. Air and soil temperatures 24
3.3. Precipitation(mm) 26
3.4. Soil moisture content (%) 28
3.4.1. Statistical analysis 32
3.4.2. Seasonal variation of soil moisture content (%) 34
3.4.3. Soil moisture content and environmental variables 39
3.5. Variation of soil moisture content (%) on precipitation at 0mm 42
Ⅳ. Conclusion 44
References 46
Abstract (in Korean) 55
Table 1. Forest types and the extent of area (ha) in Gongju-si 16
Table 2. Species composition obtained from vegetation survey in the study site 17
Figure 1. Weight of organic matter of the soil sample obtained at the study site (2021 -2023). 20
Figure 2. Soil density (Kg/m³) of the soil sample obtained at the study site (2021 -2023). 20
Figure 3. Daily variation of photosynthetic photon flux density (µmol/m²/s) during study period (2021 to 2023). Foliage season (FS), Non foliage season (NFS) 22
Figure 4. Daily variation of photosynthetic photon flux density - PPFD (µmol/m²/s) during foliage season (a) and non-foliage season (b) from 2021 to 2023. 23
Figure 5. Variation of daily mean air (Ta) and soil temperature (Ts) during study period (2021 to 2023) Foliage season (FS), Non foliage season (NFS). 25
Figure 6. Change of daily precipitation(mm) recorded during study period (2021 to 2023). 27
Figure 7. Total mean measurement of soil moisture content of each point (1 to 3); Soil moisture content (SMC %), soil temperature (Ts ℃) 29
Figure 8. Total mean measurement of soil moisture content of each point (4 to 6); Soil moisture content (SMC %), soil temperature (Ts ℃) 30
Figure 9. Variation of soil moisture content (SMC) in points (1 to 4), (5 & 6) and precipitation in the study site in 2021 to 2023. 31
Figure 10. Standard deviation (%) and Coefficient of variation (%) versus average soil moisture contents from 2021 to 2023 at the study period. 33
Figure 11. Seasonal variation (foliage season) of soil moisture content (%) in points a] (1-4), b] (5-6) and precipitation in the study site in 2021 to 2023. 37
Figure 12. Seasonal variation (non - foliage season) of soil moisture content (%) in point a] (1-4), b] (5-6) and precipitation in the study site in 2021 to 2023. 38
Figure 13. Variation of monthly mean air (Ta) and soil temperature (Ts) from 2021 to 2023. 40
Figure 14. Variation of monthly photosynthetic photon flux density(µmol) during study period; a) Foliage season, b) Non foliage season. 40
Figure 15. Variation of soil moisture content (%) on precipitation(0mm) events at point 1 (a)~point 6 (f) during study period (2021 to 2023). 43