lecture 7 Flashcards
soil taxonomy
factors of soil formation
climate, organism, relief, parent material, time
a comprehensice classification system developed by the US department of agriculture (USDA) soil survey staff
soil taxonomy
2 unique features of soil taxonomy
- based on soil properties that can be objectively observed or measured
- nomenclature gives a definite connotation of the major characteristics of the soil
No name derivation
Recently formed
No diagnostic horizon
Found in any climate on every recent geomarphic surfaces
forest or savanna vegetation
entisols
from the latin “ultimus’ means last
argilic diagnosis horizon
Has an argilic diagnosis horizon
Low supply of bases <35% base saturation or decreseases with depth, must contain weatherable minerals
formed under moist condition but with dry periods during warmer months
ultisols
from the french “oxide” which means oxidized
soils of the tropics and subtropics
low traces of weatherable minerals
low cation exchange capacity
have an oxic diagnostic horizon
oxisols
from the latin “inceptum” which means the beginning
has a diagnostic horizon that can form in a short time
usually moist with pedogenic horizons of alternation of paremt material but not of illuviation
direction of soil development is no
I AM SUAVE HOG
Inceptisols
Ardisols
Mollisols
Spodsols
Ultisols
Andisols
Vertisols
Entisols
Histosols
Oxisols
Gelisols
means the beginning, diagnostic horizon, moist with pedogenic horizon
inceptisols
Argillic diagnostic horizon
Alfisols
soft, lack of vertisols (cracking)
mollisols
wood ash, humid cool region
spodsols
last, dry period during warm months
ultisols
black, dark soil from volcanix ejrcta
andisols
turn/inverted shrink swelling clay
vertisols
