An Introduction to Hydric Soils and Hydric Soil Terminology. A word about the NTCHS. Wetlands
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1 An Introduction to Hydric Soils and Hydric Soil Terminology Based on deliberations of: The National Technical Committee for Hydric Soils (NTCHS). A word about the NTCHS The National Technical Committee for Hydric Soils is a committee with the following representation: Seven representatives from the various universities. Five representatives from the USDA, Natural Resources Conservation Service (NRCS). One representatives from each the following federal agencies: USDA, Forest Service, US Army Corps of Engineering, EPA, US Fish and Wildlife Service, and Bureau of Land Management. The NTCHS make all decisions concerning hydric soils. Decision are by majority vote. The only agency bound by NTCHS decisions is NRCS. By relying heavily on the scientific and technical communities for its membership, most NTCHS decisions are quite sound. Wetlands 1
2 Wetlands In most cases (previous slide) there are three technical criteria that must be met before an area can be called a wetland: Wetland Hydrology, Wetland Vegetation, and Hydric Soils. Throughout this lecture and all remaining lectures we are not going to concern ourselves with Wetland Hydrology and Wetland Vegetation. We are going to concentrate our efforts on learning about Hydric Soils. Hydric Soil Topics Hydric Soil Definition Hydric Soil Lists Hydric Soil Indicators Hydric Soil The definition provides up the basis for this lecture, the hydric soil lists are for off-site (office use), and the indicators provide us the best method of field identifying and delineating hydric soils. The ultimate goal of this lecture series is for you to fully understand hydric soils. Hydric Soil Definition A soil that formed under conditions of saturation, flooding, or ponding long enough during the growing season to develop anaerobic conditions in the upper part (Federal Register. July 13, 1994). The definition sets the stage for this and future lectures and parts of the definition will be referenced often. that formed under means that there are such things as drained hydric soils; that the presence of ditches do not alter the status of a hydric soil. saturation, flooding, and ponding tells us there are three conditions for wetness. These 3 conditions of wetness are utilized differently. during the growing season will be applied differently for different applications. develop anaerobic conditions tell us that a hydric soil need not be reduced but only lack oxygen. in the upper part is vague enough to allow interpretations that vary from region to region and from climate to climate. This definition has many different forms in the 1 1/2 decades prior to 1994; the NTCHS does not anticipate changing this (1994) version. 2
3 Special consideration: Flooded and Ponded Soils The NTCHS has deliberated that a soil that is frequently flooded or ponded for long or very long duration (longer than 7 days) during the growing season is a Hydric Soil. However; Anaerobic conditions (as defined in the Hydric Soil Technical Standard) must exist also. This (meaning inundation)) provides us the first method of identifying a hydric soil (there will be two others). This method of identifying a hydric soil requires use of during the growing season data. Growing Season Growing Season: The portion of the year when soil temperatures are above biologic zero 5 degrees C (41 degrees F) at 50 cm (19.7"). The following growing season months are assumed for each of the actual mean annual soil temperatures and soil temperature regimes of Soil Taxonomy: No Permafrost and 22 0 C or higher Isohyperthermic: January-December 22 0 C or Higher Hyperthermic: February-December 15 to 22 0 C Isothermic: January-December 15 to 22 0 C Thermic: February-October 8 to 15 0 C Isomesic: January-December 8 to 15 0 C Mesic: March-October Lower than 8 0 C Frigid: May-September Lower than 8 0 C Isofrigid: May-September Soil Taxonomy Requirements Cryic: May -August Permafrost and C or lower Hypergelic: July-August -4 to C Pergelic: July-August +1 to -4 0 C Subgelic: July-August Hydric Soil List: Most hydric soil lists are created by a soil scientist based on local experience and knowledge. 3
4 Clay County, Florida Percent Map symbol and Component Landform Hydric map unit name of map rating unit 8: Sapelo fine sand Sapelo, hydric 20 Flats Yes Rutlege 3 Depressions Yes Albany 10 Knolls No Sapalo, nonhydric 67 Flatwoods No 9: Leon fine sand Leon, hydric 10 Flats Yes Lynn Haven 3 Flats Yes Sapelo, hydric 3 Flats Yes Leon, nonhydric 70 Flatwoods No Sapelo, nonhydric 14 Flatwoods No 11: Allanton and Rutlege Allanton 45 Depressions Yes mucky fine sands, depressional Rutlege 35 Depressions Yes Surrency 5 Depressions Yes Sapelo, hydric 5 Flats Yes Leon, nonhydric 10 Flatwoods No 12: Surrency fine sand, depressional Surrency 80 Depressions Yes Leon, hydric 3 Flats Yes Meggett 3 Flats Yes Rutlege 3 Depressions Yes Santee 2 Flood plains Yes Plummer 9 Flatwoods No 13: Meggett fine sandy loam Meggett 85 Flats Yes Goldhead, nonhydric 15 Flatwoods No 17: Plummer fine sand Plummer, hydric 20 Flats Yes Pelham, nonhydric 15 Flatwoods No Plummer, nonhydric 65 Flatwoods No 19: Osier fine sand Osier, hydric 15 Flats Yes Rutlege 2 Depressions Yes Osier, nonhydric 65 Flatwoods No Albany 10 Knolls No Hurricane 8 Knolls No 20: Scranton fine sand Scranton, hydric 15 Flats Yes Leon, hydric 3 Flats Yes Rutlege 2 Depressions Yes Scranton 68 Flatwoods No Ridgewood 5 Knolls No Ona, nonhydric 3 Flatwoods No 4
5 Inherent Problems with Hydric Soil Lists There is a problem with hydric soil lists which may confuse users (Hurt and Carlisle. 1997). The presence of a soil on a hydric soil list does not mean that the soil is in fact hydric. This is only an interpretive rating. Just as is the case with all interpretations based on information in a published soil survey or other sources of estimated soil properties, hydric soil interpretations are confirmed by on-site investigations. Hydric soil indicators (Hurt and Vasilas. 2006) provides us a method of on-site confirmation of the presence or absence of a hydric soil. Hydric Soil Indicators Field Indicators of Hydric Soils in the US (Vasilas, et.al. 2006) has been approved as the sole source document for hydric soil identification and delineation i by the NRCS, US Army COE, EPA, and US Fish and Wildlife Service. It has also been approved as the sole source document for hydric soil identification and delineation by the State of Florida (DEP and Water Management Districts). The beauty of the hydric soil indicators is that they provide us a method to prove or disproved the presence of a hydric soil based on something felt, seen, or smelled and not estimated or guessed. 5
6 Indicators are based on biogeochemical processes that occur when a soil is saturated or inundated. Biogeochemical Processes Biogeochemical processes are processes that alter soil due to the interaction of its chemical composition and the animal and plant life it supports. Hydric soil indicators are based on several biogeochemical processes (Vepraskas. 1994) that occur when soils are saturated or inundated (this subject will be covered thoroughly in the lecture of redoximorphic features). Iron Carbon Carbon and Iron Carbon and/or Iron Carbon and Iron/Manganese Iron/Manganese Sulfur Algae The processes and the hydric soil indicator that result from the processes are reviewed in the next few slides. The indicators will be covered in depth during a later lecture. Ignore their being referenced for now; you may need to refer back after the next lecture. Twelve indicators are based on iron reduction, transformation, and differential accumulation: A13, A14, A15, S4, S5, F2, F3, F8, F9, F18, F19 and F20. Iron 6
7 Nineteen indicators are based on carbon accumulation and differential i decomposition: A1, A2, A3, A5, A6, A7, A8, A9, A10, S1, S2, S3, S7, S8, S9, F1, F11, F13, and F17. Carbon Carbon and Iron Four indicators are based on carbon accumulation and differential decomposition and iron reduction, translocation, and differential accumulation: A11, A12, F6, and F7. Carbon and/or Iron One indicator is based on carbon accumulation and differential decomposition and/or iron reduction, translocation, and differential accumulation: S6. 7
8 Carbon and Iron/Manganese One indicator is based on carbon accumulation and differential decomposition and iron/manganese reduction, translocation, and differential accumulation: F16. One indicator is based on iron/manganese reduction, transformation, and differential accumulation: F12. Iron/Manganese One indicator is based on sulfur reduction: A4. Sulfur 8
9 One indicator is based on precipitation of calcium carbonate by algae: F10. Algae Where do we begin our observations? To determine whether an indicator is present or not it is critical to know where to begin looking. To determine whether a hydric soil indicator is present we would begin our observation of the soil in the photo to the right beneath the knife blade (below the fibric and hemic material) in most LRRs but where we begin our observations varies from region to region (next slide). Where to look for an Indicator by LRR (see slide 31) The soil surface is the very top of the material upon which standing nationwide when applying indicators A1 and A2 and in LRRs F, G, H, and M if the material beneath any mucky peat and/or peat is sandy. In LRR R the soil surface is the top of the mineral surface (underneath any and all fibric, hemic, and/or sapric material) except for application of A1 and A2. In the remaining LRRs and in LRRs F, G, H, and M if the material beneath any mucky peat and/or peat is not sandy the soil surface is the top of the muck or mineral surface (underneath any fibric and/or hemic material) except for application of A1 and A2. 9
10 Field Indicators of Hydric Soils in the US The remain portion of this lecture pertains to the publication Field Indicators of Hydric Soils in the US (Hurt and Vasilas 2006) The current version is Version 6.0; the picture to the right is of the cover to Version 3.2 (Hurt, et al. 1996) Regionalization of Hydric Soil Indicators The NTCHS has approved each of the indicators for use in specific regions of the US (USDA, SCS. 1981). Most are based on Land Resource Regions (LRRs, next slide). Some are based on the smaller Major Land Resource Areas (MLRAs). Appendix 1 in Field Indicators of Hydric Soils in the US is a listing of the indicators approved for use in each LRR. A prime example of regionalization: Only the presence of muck is required in south Florida, as one goes North thicker layers are required. In New England (and other areas) muck (sapric material) occurs on upland soils so this indicator is not used in LRR R. 10
11 Basic Terms There are some basic terms used throughout that need explaining. These terms are defined here because they are used in the definitions of many of the indicators. Depleted Matrix - Indicators A11, A12, F3, F9, and F12. Gleyed Matrix Indicators A11, A12, A14, S4, and F2. Reduced Matrix Indicators A11,A12, A14, S4, F2, F3, F9, and F12. 70% masked by organic matter- Indicators A5, A11, A12, S7, S8, and S9. Depleted Matrix For loamy and clayey soil material (and sandy soil material for application of Indicators A11 and A12), a depleted matrix refers to the volume of a soil horizon or subhorizon from which iron has been removed or transformed by processes of reduction and translocation to create colors of low chroma and high value. A, E and calcic horizons may have low chromas and high values and may therefore be mistaken for a depleted matrix; however, they are excluded from the concept of depleted matrix unless common or many, distinct or prominent redox concentrations as soft masses or pore linings are present. In some places the depleted matrix may change color upon exposure to air (Reduced Matrix), this phenomena is included in the concept of depleted matrix. 11
12 Depleted Matrix The following combinations of value and chroma identify a depleted matrix: 1. Matrix value 5 or more and chroma 1 with or without redox concentrations as soft masses and/or pore linings; or 2. Matrix value 6 or more and chroma 1 or 2 with or without redox concentrations as soft masses and/or pore linings; or 3. Matrix value 4 or 5 and chroma 2 and has 2 percent or more distinct or prominent redox concentrations as soft masses and/or pore linings; or 4. Matrix value 4 and chroma 1 and has 2 percent or more distinct or prominent redox concentrations as soft masses and/or pore linings. Gleyed Matrix Soils with a gleyed matrix have the following combinations of hue, value, and chroma and the soils are not glauconitic: 1. 10Y, 5GY, 10GY, 10G, 5BG, 10BG, 5B, 10B, or 5PB with value 4 or more and chroma is 1; or 2. 5G with value 4 or more and chroma is 1 or 2; or 3. N with value 4 or more; or In some places the gleyed matrix may change color upon exposure to air (reduced matrix). This phenomena is included in the concept of gleyed matrix. Depleted Depleted Gleyed 4/2, 5/2, 4/1 >5/1, >6/2 value >4, with 2% or more with or gley pages redox without redox of color concentrations concentrations charts 12
13 Depleted Matrix The range of colors for the depleted matrix is value 4 or more and chroma 1 or 2; however, colors of value 4 and chroma 1 or 2 and value 5 and chroma 2 must have redox concentrations. Prominent Prominent Prominent Distinct Distinct Distinct Faint Faint Faint Matrix Color 10YR 4/2 Gleyed Matrix The range of colors for the gleyed matrix is value 4 or more on either ih of the two gley color charts. 13
14 Reduced Matrix A reduced matrix is a matrix that upon initial exposure fits the color requirements of either a depleted matrix or a gleyed matrix but changes color (redder hue) when exposed to air for about 30 minutes (Vepraskas. 1994). In the next slide a soil (left photo) with a depleted/gleyed matrix upon initial exposure was air dried for 7 days (right photo). This is a classic example of a reduced matrix. The most reduced areas turned the reddest after exposure. Some hue changes occurred after 30 minutes but the change was more dramatic after 7 days. The white bar in both photos is 1 cm long. Reduced Matrix The picture on the right is sandy soil material with (clockwise from top) 50, 60, and 70% masked with organic material. Organic carbon content of the samples are about 2, 3, and 4 % respectively. 70% Masked 14
15 Moist Color All color requirements (hue, value, and chroma) are for moist color. If dry, moisten to record color; if wet, allow to dry to moist state. This picture shows moist soil (L) and dry soil (R). Features are usually more readily identifiable in moist state; they may be missing if soil is too wet (let dry). Chroma 2 2+ Soil colors specified in the Indicators do not have decimal points listed; however, colors do occur between Munsell (Gretag/Macbeth. 2000) chips. Soil colors should not be rounded to qualify as meeting an indicator. For example: a soil matrix with a chroma between 2 and 3 should be listed as having a chroma of 2+. This soil material does not have a chroma 2 and would not meet any indicator that requires a chroma 2 or less. Summary We have explained the Hydric Soil Definition, Hydric Soil Lists. Hydric Soil Indicators, and introduced Hydric Soil. The definition provides up the basis for this lecture, hydric soil lists are for off-site (office use), and the indicators provide us the best method of identifying and delineating hydric soils (field use). Evidence of flooding and ponding can be used as the sole source of evidence that an area has hydric soils if it has been shown that anaerobic conditions have been met but really should not be invoked. The presence of a soil on a hydric soil list does not mean that the soil is in fact hydric; it is only an interpretive rating. 15
16 Summary (cont.) Hydric soil indicators are based on several biogeochemical processes that occur when soils are saturated or inundated: Iron, Carbon, Carbon and Iron, Carbon and/or Iron, Carbon and Iron/Manganese, Iron/Manganese, Sulfur, and Algae. Field Indicators of Hydric Soils in the US (Hurt and Vasilas) provides the structure of the regionalization of hydric soil indicators and defines the terms depleted matrix, gleyed matrix, and reduced matrix. Moist colors should be recorded and, although colors do occur between Munsell chips, soil colors should not be rounded to qualify as meeting an indicator. Literature Cited Environmental Laboratory Corps of Engineers Wetland Delineation Manual - Technical Report Y US Army Engineers Waterways Experiment Station, Vicksburg, MS. Federal Register. July 13, Changes in Hydric Soils of the United States. Washington, DC. (current Hydric Soil Definition). Hurt, G.W., and V.W. Carlisle Proper use of hydric soil terminology. Soil Survey Horizons, Vol. 38, No. 4, Madison, WI. Literature Cited (cont.) Vasilas, L.M., G.W. Hurt, and C.V. Noble Field indicators of hydric soils in the United States (Version 7.0), USDA, NRCS, Fort Worth, TX. Xrite Munsell Color. New Windsor, NY. USDA, SCS Land Resource Regions and Major Land Resource Areas of the United States. USDA-SCS Agricultural Handbook 296. US Govt. Printing Off., Washington, DC. Vepraskas, M. J Redoximorphic Features for Identifying Aquic Conditions. Tech. Bulletin 301. North Carolina Ag. Research Service, North Carolina State Univ., Raleigh, North Carolina. 16
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