文档介绍：Chapter 6 Soil 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
Soil Science
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
What is Soil? — continued
…unconsolidated surficial material
Short-sighted Engineer, 1985
The unconsolidated mineral anic 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.
Agronomist
Forester
Horticulturalist
Engineer
Environmentalist
What is Soil?
— continued
What is Soil? — continued
Soil is a natural body consisting of horizontal layers of mineral anic 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 Does soil do?
Healthy soil gives us clean air and water, bountiful crops and forests, productive rangeland, diverse wildlife, and beautiful landscapes.
ponents
The Soil Ecosystem includes biotic and abiotic.
Solid phase: minerals and weathered rock; fragments,
organic matter; anism
Liquid phase: water (rain、snow)
Gas phase: gases CO2 (higher)、O2(lower)
ponents
Figure 1 Most soils contain four ponents: mineral particles, water, air, anic matter. Organic matter can be further sub-divided into humus, roots, and anisms. The values given above are for an average soil.