华中科技大学同济医学院：《环境卫生学》课程教学资源（PPT课件）第六章 土壤卫生 Soil and Health

Chapter 6 Soil and Health 我

Chapter 6 Soil and Health

Hygiene significances and characteristics of soil ( Hygiene significances of soi the essence of life Relationship between soil characteristics and human life >Impact of soil quality on humans survival and health

一、Hygiene significances and characteristics of soil （一）Hygiene significances of soil ➢ the essence of life ➢ Relationship between soil characteristics and human life ➢ Impact of soil quality on humans survival and health

Relation of soil science to other sciences Rerxtion of SoilScieite to Otheysiences Soil scence

Chemistry Zoology Micro￾biology Agronomy Engin Arch￾aeology Forestry Geography Geology Physics Climat￾ology Relation of Soil Science to Other Sciences Relation of Soil Science to Other Sciences

What is Soil? It is not dirt PEEPLES 80 JOEDIRT 可,、英

What is Soil? It is not Dirt

What is soil?- continued unconsolidated surficial material Short-sighted Engineer, 1985 The unconsolidated mineral or organic material on the immediate surface of the earth that serves as a natural medium for the growth of land plants Sense the soil-feel, smell, see, hear No one's definition is necessarily right or wrong

What is Soil? — continued …unconsolidated surficial material Short-sighted Engineer, 1985 The unconsolidated mineral or organic material on the immediate surface of the earth that serves as a natural medium for the growth of land plants. Sense the Soil – feel, smell, see, hear… —No one's definition is necessarily right or wrong

What is Soil? 下基 Agronomist Forester Horticulturalist Engineer Environmentalist

Agronomist Forester Horticulturalist Engineer Environmentalist What is Soil? — continued

What is soil?continued Soil is a natural body consisting of horizontal layers of mineral and organic constituents of variable thicknesses which differ from the original material in their morphological physical, chemical, and mineralogical properties. At least some of these properties are due to soil-forming processes

What is Soil? — continued Soil is a natural body consisting of horizontal layers of mineral and organic constituents of variable thicknesses which differ from the original material in their morphological, physical, chemical, and mineralogical properties. At least some of these properties are due to soil-forming processes

What DDoes soil do? Healthy soil gives us clean air and water, bountiful crops and forests, productive rangeland, diverse wildlife, and beautiful landscapes

What Does soil do? Healthy soil gives us clean air and water, bountiful crops and forests, productive rangeland, diverse wildlife, and beautiful landscapes

Soil components The Soil Ecosystem includes biotic and abiotic Solid phase: minerals and weathered rock; fragments, organic matter, microorganism Liquid phase: water(rain, snow Gas phase: gases CO2(higher), O2(lower)

Soil components The Soil Ecosystem includes biotic and abiotic. Solid phase: minerals and weathered rock; fragments, organic matter; microorganism Liquid phase: water (rain、snow) Gas phase: gases CO2 (higher)、O2(lower)

Soil components Air 25% Mineral Water 25% Particles 45% Organic Matter 5% Organisms 10% Humus Roots 80% 10% Figure 1 Most soils contain four basic components: mineral particles, water, air, and organic matter. Organic matter can be further sub-divided into humus, roots, and living organisms. The values given above are for an average soil

Soil components Figure 1 Most soils contain four basic components: mineral particles, water, air, and organic matter. Organic matter can be further sub-divided into humus, roots, and living organisms. The values given above are for an average soil