“Jackson-Sherman soil weathering stages”的意思、由来-百科全书

Jackson-Sherman soil weathering stages

Table

Jackson-Sherman soil weathering stages

characteristic minerals in soil clay fraction

characteristic chemical and physical conditions of soil

characteristic soil profile features

early stage

gypsum, carbonates, olivine/pyroxene/ amphibole, Fe²⁺-bearing micas, and feldspars

low water and humus content, limited leaching, reducing environments, and limited time for weathering

minimally weathered soils all over the world, though mainly in arid regions, where low rainfall keeps weathering to a minimum

intermediate stage

quartz, mica/illite, vermiculite/chlorite, and smectite

retention of Na, K, Ca, Mg, Fe²⁺, and silica; alkalinity

and ineffective leaching; igneous rock rich in Ca, Mg, and Fe²⁺ but no Fe²⁺ oxides; easily hydrolyzed silicates; and transport of silica into

the weathering zone

soils of temperate regions developed under grass or

trees--i.e., the major agricultural soils of the

world

advanced stage

kaolin, aluminum and

iron oxides, and titanium oxides

removal of Na, K, Ca, Mg, Fe²⁺, and silica; effective leaching by fresh water; low pH; and dispersion of silica

intensely weathered soils of the humid tropics, frequently characterized by acidity and low fertility

See as table:

词条	Jackson-Sherman soil weathering stages
释义	Jackson-Sherman soil weathering stages Table Jackson-Sherman soil weathering stages characteristic minerals in soil clay fraction characteristic chemical and physical conditions of soil characteristic soil profile features early stage gypsum, carbonates, olivine/pyroxene/ amphibole, Fe²⁺-bearing micas, and feldspars low water and humus content, limited leaching, reducing environments, and limited time for weathering minimally weathered soils all over the world, though mainly in arid regions, where low rainfall keeps weathering to a minimum intermediate stage quartz, mica/illite, vermiculite/chlorite, and smectite retention of Na, K, Ca, Mg, Fe²⁺, and silica; alkalinity and ineffective leaching; igneous rock rich in Ca, Mg, and Fe²⁺ but no Fe²⁺ oxides; easily hydrolyzed silicates; and transport of silica into the weathering zone soils of temperate regions developed under grass or trees--i.e., the major agricultural soils of the world advanced stage kaolin, aluminum and iron oxides, and titanium oxides removal of Na, K, Ca, Mg, Fe²⁺, and silica; effective leaching by fresh water; low pH; and dispersion of silica intensely weathered soils of the humid tropics, frequently characterized by acidity and low fertility See as table:
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