Integrated Fundamentals of Soil Science: Processes, Properties and Sustainable Management

Soil is a dynamic natural body that mediates exchanges among the lithosphere, biosphere, hydrosphere and atmosphere, while supporting terrestrial productivity, biodiversity, water regulation and biogeochemical cycling. This chapter introduces the conceptual foundations of soil science for advanced study in geoscience, agriculture and environmental science. It traces the development of soil concepts from early agricultural interpretations to modern views of soil as a living, self-organising biogeochemical system within the critical zone. The chapter explains the scope of soil science through its principal domains, including pedology, edaphology, soil physics, soil chemistry and biochemistry, soil ecology and soil information science. It then examines soil as a natural body through the clorpt framework, soil profiles, master horizons and key morphological properties such as colour, texture and structure. The discussion further presents the four-component model of soil, comprising mineral matter, organic matter, water and air, and relates these components to the elemental and mineralogical composition of the earth's crust. Processes of mineral weathering, organic matter stabilisation, soil water and soil air dynamics are described in relation to nutrient supply, carbon storage and greenhouse gas exchange. Finally, the chapter situates soil science in the anthropocene, where degradation, climate change and food security concerns require integrated approaches, including digital soil mapping, regenerative land management and evidence-based soil carbon management.