Nebraska Soils Field Trip - Virginia Tech

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4th IUSS Soil Classification Conference <strong>Field</strong> Tour Guidebook 1) Definition of human-transported materials added to Soil Taxonomy. 2) Definition of anthropogenic features added to Soil Taxonomy. 3) Manufactured layers and manufactured layer contact defined, added to Soil Taxonomy. 4) Proposal to add “^” (caret) before the master horizon letter of horizons and layers formed in humantransported materials accepted. Caret added to list of Master Horizon prefixes, added to Soil Taxonomy. 5) Proposal to add new master horizon letter M for human-manufactured impervious subsurface layers [geotextile liners, asphalt, concrete, rubber, and plastic] accepted, added to Soil Taxonomy. 6) Proposal to add “u” as a choice of suffix lowercase letters to indicate the presence of artifacts was accepted, added to Soil Taxonomy. 7) Definition of terms for artifacts added to NRCS soil survey system including National Soil Survey Handbook and NASIS: a) Artifacts defined. 1) Safety categories added (not accepted). 2) Size Categories added (not accepted). 3) Type categories defined (not accepted, individual type described). 4) Rupture resistance (use the same as for other soil material). 5) Texture Modifiers (categories added for artifactual, very artifactual, extremely artifactual using the same percentage volume as rock fragments). Added artifacts as a term in lieu of texture [similar to fragmental]. b) Modification of definition of fragments to include artifacts. 8) Current proposals to amend Soil Taxonomy, to be evaluated May, 2011 at the National Soil Survey Conference in Asheville, NC: CHAPTER 1. CHANGES TO THE DEFINITION OF “BURIED SOILS” Proposed Action 1: Change the definition of buried soils to list plaggen epipedon and human-transported material as equivalent to the mantle. CHAPTER 3. CHANGES TO HORIZONS AND CHARACTERISTICS OF MINERAL SOILS Proposed Action 2: Insert a more explicit definition before the required characteristics for the anthropic epipedon Proposed Action 3: Modify the definition of the anthropic epipedon to delete some requirements that are the same as mollic epipedon, exclude evidence of long-term manuring, modify the minimum thickness, and modify the carbon requirement. Proposed Action 4: Change item 7 of the definition of the mollic epipedon on page 8 and the umbric epipedon to exclude human-transported materials, anthraquic conditions, artifacts, and intentional additions of human-applied organic amendments to meet the minimum organic carbon content. Proposed Action 5: Change the definition of plaggen epipedon to include reference to the ad hoc proposal to amend the National Soil Survey Handbook, Part 629: Glossary of Landform and Geologic Terms where raised landforms are discussed, and mention of human-altered and human-transported materials. Proposed Action 6: Change the following parts of the definition of folistic, histic, and melanic epipedons to exclude them from meeting the definition of anthropic epipedon. Proposed Action 7: Add definition of Artifacts to Chapter 3. 108
4th IUSS Soil Classification Conference <strong>Field</strong> Tour Guidebook Proposed Action 8: Add: Definition of Human-altered Material to Chapter 3, including a specific description and evidence (e.g., similar to the evidence listed for lithologic discontinuity rather than the specific criteria requirements for andic soil properties). Proposed Action 9: Add definition of Human-transported Material to Chapter 3, including a specific description and evidence (e.g., similar to the evidence listed for lithologic discontinuity rather than the specific criteria requirements for andic soil properties). Proposed Action 10: Add definition of Manufactured Layer to Chapter 3. Proposed Action 11: Add definition of Manufactured Layer Contact to Chapter 3. Proposed Action 12: Modify and move definition of Surface Mantle of New Soil Material from Chapter 1 to Chapter 3. Criteria listed in a format consistent with other defined materials. CHAPTER 4. MODIFICATION TO THE KEY TO SOIL ORDERS Proposed Action 13: Modify the Key to Soil Orders for Inceptisols to include anthropic and folistic epipedons to the list of epipedons (such as histic, mollic, or umbric) that qualify soils in the order. CHAPTER 5-16: CHANGES IN KEYS IN MULTIPLE PLACES Changes to Chapter 7: Key to Aridisols. Proposed Action 14: Delete Anthracambids great group and Typic Anthracambids subgroup. Changes to Chapter 8: The Key to Entisols. Proposed Action 15: Delete the Key to Arents, and the Key to Great Groups of Arents. Move Torriarents and Xerarents from a suborder to subgroup level. Proposed Action 16: Delete the Key to Arents, and the Key to Great Groups of Arents. Move Ustarents and Udarents from a suborder to subgroup level recognition. Proposed Action 17: Delete the Plagganthreptic intergrade subgroup of Udipsamments. Proposed Action 18: Delete the subgroup of Anthropic Torrifluvents. Proposed Action 19: Add an exclusionary statement to Fluvents to prevent human-transported soils from being classified as Fluvents. These soils would then be classified as Orthents. Proposed Action 20: Add an exclusionary statement to Fluvaquents on page 124 to prevent humantransported soils from being classified as Fluvaquents. These soils would then be classified as Epiaquents or Endoaquents. Changes to Chapter 11: Key to Suborders of Inceptisols. Proposed Action 21: Eliminate Anthrepts. Changes to Chapter 14: Key to Spodosols. Proposed Action 22: Eliminate Plagganthreptic Fragiaquods. Proposed Action 23: Eliminate Plagganthreptic Haplohumods. 109
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Nebraska Soils Field Trip - Virginia Tech

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