Paleaquult and landscape CN
Soil profile: An Aquic soil profile (Typic Paleaqult) in Boluo County, Guangdong Province, China (PRC-01).
Landscape: Rice field post harvesting. We asked how long rice had been cultivated in this area. After several minutes someone returned and informed us rice had “always” been grown here... thousands of years!
Note the horizonation of the A horizon. The second layer is a mechanically compacted zone (densic layer) that acts as an aquitard. Densic materials (d) are normally little affected by soil development, the exception being mechanically compacted layers such as a plow pan if they are root limiting and not cemented. This pedon had been in continuous rice production for over a thousand years
An aqult is a suborder of the soil order Ultisol; seasonally wet, it is saturated with water a significant part of the year unless drained; surface horizon of the soil profile is dark and varies in thickness, grading to gray in the deeper portions; it occurs in depressions or on wide upland flats from which water drains very slowly.
This profile contained 3 to 5 percent plinthite below a depth of 125 centimeters.
An aquic soil is saturated with water and virtually free of gaseous oxygen for sufficient periods of time, such that there is evidence of poor aeration (gleying and mottling), common in wetlands.
For more information on Soil Taxonomy, visit:
www.nrcs.usda.gov/wps/portal/nrcs/main/soils/survey/class/
For more photos related to soils and landscapes visit:
www.flickr.com/photos/soilscience/sets/72157622983226139/
Paleaquult and landscape CN
Soil profile: An Aquic soil profile (Typic Paleaqult) in Boluo County, Guangdong Province, China (PRC-01).
Landscape: Rice field post harvesting. We asked how long rice had been cultivated in this area. After several minutes someone returned and informed us rice had “always” been grown here... thousands of years!
Note the horizonation of the A horizon. The second layer is a mechanically compacted zone (densic layer) that acts as an aquitard. Densic materials (d) are normally little affected by soil development, the exception being mechanically compacted layers such as a plow pan if they are root limiting and not cemented. This pedon had been in continuous rice production for over a thousand years
An aqult is a suborder of the soil order Ultisol; seasonally wet, it is saturated with water a significant part of the year unless drained; surface horizon of the soil profile is dark and varies in thickness, grading to gray in the deeper portions; it occurs in depressions or on wide upland flats from which water drains very slowly.
This profile contained 3 to 5 percent plinthite below a depth of 125 centimeters.
An aquic soil is saturated with water and virtually free of gaseous oxygen for sufficient periods of time, such that there is evidence of poor aeration (gleying and mottling), common in wetlands.
For more information on Soil Taxonomy, visit:
www.nrcs.usda.gov/wps/portal/nrcs/main/soils/survey/class/
For more photos related to soils and landscapes visit:
www.flickr.com/photos/soilscience/sets/72157622983226139/