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Ecological site F145XY001MA

Silty High Floodplain

Last updated: 9/27/2024
Accessed: 11/24/2024

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General information

Provisional. A provisional ecological site description has undergone quality control and quality assurance review. It contains a working state and transition model and enough information to identify the ecological site.

MLRA notes

Major Land Resource Area (MLRA): 145X–Connecticut Valley

Major Land Resource Area (MLRA): 145 – Connecticut Valley (USDA-NRCS, 2006).
The nearly level floor of the Connecticut Valley makes up most of the area. Nearly level to sloping lowlands are at the outer edges of the river valley. These lowlands are broken by isolated, north- to south-trending trap-rock ridges that are hilly and steep. Elevation ranges from sea level to 100 meters (330 feet) in the lowlands and from 50 to 100 meters (650 to 1,000 feet) on ridges. The geology of this rift valley is a late Triassic and early Jurassic sandstone, shale, and conglomerate sequence. Tilted basalt flows along rift zones form the trap rock ridges exhibiting the greatest landscape relief. Glaciation accounts for glacial lake deposits, outwash, and till. Following glacial retreat, wind-deposited loess caps some areas. Recent alluvium deposits form well-developed flood plain along the Connecticut River. These deposits created some of the most productive agricultural soils in New England. The dominant soils are entisols and inceptisols with a mesic temperature regime in combination with parent materials such as glacial lakebeds, glacial outwash, glacial till, and recent alluvium. From north-to-south within the Connecticut Valley, the climate transitions from humid-continental to humid temperate with pronounced seasons and frequent storms. The forests are predominately central hardwoods to the south and transition hardwoods to the north. Significant habitats include trap rock ridges, sandplains, and floodplains of the Connecticut River and major tributaries. Much of the area is currently in residential and urban development and agriculture. While much of the areas is also forested, habitat loss and fragmentation are widespread throughout the Connecticut Valley. The Silty High Floodplain ecological site is found in the highest position with the least flooding in the elevational profile of active floodplains of variously sized rivers.

Classification relationships

USDA-NRCS (USDA, 2006):
Land Resource Region (LRR): R – Northeastern Forage and Forest Region
Major Land Resource Area (MLRA): 145 – Connecticut Valley

USDA-FS (Cleland et al, 2007):
Province: 221 – Eastern Broadleaf Forest
Section: 221A – Lower New England
Subsection: 221Af –Lower Connecticut River Valley
Province: M211 – Adirondack New England Mixed Forest – Coniferous Forest – Alpine Meadow (in part)
Section: M211B– New England Piedmont (in part)
Subsection: 211Bb – Southern Piedmont (in part)

Ecological site concept

The Silty High Floodplain ecological site consists of deep, coarse-silty, well drained, alluvial soils on high floodplains of mostly large rivers, but can occasionally develop along medium to small-sized rivers. The site is flooded less frequently or for a shorter duration than low floodplains. The representative soil is Hadley. Reference plant community includes: Sugar Maple - Ash species - American Basswood / Ostrich Fern - White Snakeroot Floodplain Forest, or, occasionally, Silver Maple – American Elm / Sensitive Fern Floodplain Forest. Limited examples of this forest type exist since they have mostly been converted to agricultural use.

Associated sites

F145XY008MA	Dry Outwash
F145XY002MA	Silty Low Floodplain Low Floodplain occurs on moderately well drained soils.

F145XY008MA

Dry Outwash

F145XY002MA

Silty Low Floodplain

Low Floodplain occurs on moderately well drained soils.

Similar sites

F145XY004CT	Wet Lake Plain
F145XY005MA	Moist Lake Plain

F145XY004CT

Wet Lake Plain

F145XY005MA

Moist Lake Plain

Table 1. Dominant plant species

Tree	(1) Acer saccharum (2) Tilia americana
Shrub	(1) Viburnum lentago
Herbaceous	(1) Matteuccia struthiopteris (2) Ageratina altissima

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Physiographic features

The Silty High Floodplain ecological site occurs on nearly level floodplains along rivers, at higher elevational positions in the floodplain profile where flooding is rare to occasional. Flooding by stream overflow ranges from once a year to once in 5 to 10 or more years. Flooding generally occurs during the early spring runoff or occasionally during periods of high rainfall in the fall. Floodwater seldom covers these soils for periods of more than 2 or 3 days on the high bottoms, but the duration is up to 7 days in the lower positions. Slopes range from 0 to 3 percent and runoff potential is low.

Figure 1. High Floodplain - Hadley soils

Table 2. Representative physiographic features

Landforms	(1) River valley > Flood plain (2) Valley > Alluvial flat
Runoff class	Negligible to high
Flooding duration	Very brief (4 to 48 hours) to brief (2 to 7 days)
Flooding frequency	None to frequent
Ponding frequency	None
Elevation	0 – 610 m
Slope	0 – 70%
Water table depth	99 – 183 cm
Aspect	Aspect is not a significant factor

Climatic features

The regional climate of the Connecticut Valley transitions north to south, from humid-continental to humid temperate, respectively, with pronounced seasons and frequent storms. (Beck et al., 2018; Bailey, 2014). Locally, the Silty High Floodplain ecological site is dependent upon extreme flood events coinciding with freshets in the early spring due to snowmelt and heavy precipitation events within the watershed at any time (Metzler and Damman 1985).

Climate change is occurring, and the resiliency of any ecological site will depend upon the direct and indirect effects upon component species and shifting atmospheric and soil conditions. On these ecological sites, floodplain forests are at a moderate vulnerability risk to climate change with impacts considered both negative and positive. Although floodplain forests are adapted to annual and season flooding, more intense precipitation and extreme flooding due to greater storm frequency and magnitude, may pose risks associated with prolonged flooding, and streambank erosion, or provide benefits associate with greater deposition of sediments. Warmer seasonal temperatures as predicted are expected to diminish snowmelt and the benefits of sediment deposition during the spring freshets. Invasive species such as glossy buckthorn (Frangula alnus) and Japanese stiltgrass (Microstegium vimineum) continue to be a threat (Janowiak et al., 2018).

Table 3. Representative climatic features

Frost-free period (characteristic range)	128-144 days
Freeze-free period (characteristic range)	163-187 days
Precipitation total (characteristic range)	1,168-1,321 mm
Frost-free period (actual range)	114-147 days
Freeze-free period (actual range)	148-188 days
Precipitation total (actual range)	1,168-1,321 mm
Frost-free period (average)	135 days
Freeze-free period (average)	173 days
Precipitation total (average)	1,245 mm

Characteristic range

Actual range

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Figure 2. Monthly precipitation range

Characteristic range

Actual range

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Figure 3. Monthly minimum temperature range

Characteristic range

Actual range

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Figure 4. Monthly maximum temperature range

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Figure 5. Monthly average minimum and maximum temperature

Figure 6. Annual precipitation pattern

Figure 7. Annual average temperature pattern

Climate stations used

(1) HARTFORD BRADLEY INTL AP [USW00014740], Suffield, CT
(2) MIDDLETOWN 4 W [USC00064767], Middlefield, CT
(3) MT CARMEL [USC00065077], Hamden, CT
(4) AMHERST [USC00190120], Amherst, MA

Influencing water features

The Silty High Floodplain ecological site is located along low-gradient river systems of varying size from large to small. River flooding is variable, ranging from rare to occasional, coinciding with seasonal flood events during the spring freshet to extreme precipitation events throughout the year.

Wetland description

National Wetland Classification System (Cowardin et al., 1979) considers the Silty High Floodplain ecological site in the Palustrine system, with a vegetated class, such as emergent, scrub-shrub, or forested, and modified by a non-tidal water regime ranging from temporarily flooded to seasonally flooded.

Soil features

The site consists of very deep, well drained soils that formed in silty alluvial sediments derived from mixed crystalline and sedimentary rocks.

Hadley soils mapped within MLRA 145 and surrounding MLRA 144A are associated with the Silty High Floodplain ecological site.

Table 4. Representative soil features

Parent material	(1) Alluvium – metamorphic rock (2) Granite and gneiss (3) Schist (4) Quartzite
Surface texture	(1) Fine sandy loam (2) Silt loam (3) Very fine sandy loam (4) Loamy fine sand (5) Loamy sand
Family particle size	(1) Coarse-loamy (2) Coarse-silty
Drainage class	Well drained to excessively drained
Permeability class	Slow to very rapid
Depth to restrictive layer	183 cm
Surface fragment cover <=3"	0%
Surface fragment cover >3"	0%
Available water capacity (Depth not specified)	2.54 – 20.32 cm
Soil reaction (1:1 water) (Depth not specified)	4.5 – 7.8
Subsurface fragment volume <=3" (Depth not specified)	0 – 40%
Subsurface fragment volume >3" (Depth not specified)	0 – 40%

Ecological dynamics

Caveat: The vegetation information contained in this section is only provisional, based on concepts, not yet validated with field work.*]

The vegetation groupings described in this section are based on the terrestrial ecological system classification and vegetation associations developed by NatureServe (Comer et al., 2003). Terrestrial ecological SYSTEMS are specifically defined as a group of plant community types called ASSOCIATIONS that tend to co-occur within landscapes with similar ecological processes, substrates, and/or environmental gradients. They are intended to provide a classification unit that is readily mappable, often from terrain and remote imagery, and readily identifiable by conservation and resource managers in the field. A given system will typically manifest itself in a landscape at intermediate geographic scales of tens-to-thousands of hectares and will persist for 50 or more years. A vegetation association is a plant community that is much more specific to a given soil, geology, landform, climate, hydrology, and disturbance history. It is the basic unit for vegetation classification and recognized by the US National Vegetation Classification (FDGC, 2008; USNVC, 2017). Each association will be named by the diagnostic and often dominant species that occupy the different height strata (represented by tree, shrub, and herb layers). Within the NatureServe Explorer database, ecological systems are numbered by a community Ecological System Code (CES) and individual vegetation associations are assigned an identification number called a Community Element Global Code (CEGL).

Additional and more localized vegetation information can be provided by the various State Heritage Programs. Additional insights to the vegetation were provided by: "The Vegetation of Connecticut: A Preliminary Classification" (Metzler and Barrett, 2006), "Classification of the Natural Communities of Massachusetts" (Swain 2020), "Wetland, Woodland, Wildland" (Thompson and Sorenson 2000), and "Natural Communities of New Hampshire, 2nd Ed." (Spurduto and Nichols, 2011).

Due to a long history of human activity, the reference condition more accurately reflects the current naturalized, minimally-managed state rather than the historic, pre-European settlement condition. Within the Reference State, plant communities characteristic to the High Silty Floodplain ecological site belong to the Central Appalachian River Floodplain Forest system (CES202.608) (NatureServe (2020). These floodplains are often broad and well-developed along medium to large rivers and occasionally small, low-gradient river systems. Differences in the flood regime, related to proximity to the river and flood elevations, in combination with the variability of the substrate will determine the mix of floodplain vegetation (Marks et al., 2014). Silty High Floodplain ecological sites are areas within the active floodplain profile at the highest elevation and subject to the least flooding. Much of these upper floodplains have been converted to agriculture. Only small remnants of Silty High Floodplain ecological sites exist. High fertility, fragmentation, and lack of natural buffers results in susceptibility to non-native plant invasions. Besides the mature plant community-types listed, other spontaneous, successional plant community-types may exist following natural disturbances.

Other ecological states, a Semi-natural State and a Cultural State are recognized. The Semi-natural State would expect plant communities where ecological processes primarily operate with some conditioning by land management, e.g., managed forests, or plant communities that are an artifact of land management e.g., predominately invasive plants. The Cultural State is a completely converted or transformed state heavily or completely conditioned by land management, e.g., cultivated lands, pasture/haylands, vineyards, and plantations, etc. Generally, the form of vegetation in the Semi-natural State or the Cultural State is not able to be specified until field work is conducted.

[*Caveat] The vegetation information presented is representative of complex plant communities. Key indicator plants and ecological processes are described to help inform land management decisions. Plant communities will differ across the MLRA because of the naturally occurring variability in weather, soils, and geography. The reference plant community is not necessarily the management goal. The drafts of species lists are merely representative and are not botanical descriptions of all species occurring, or potentially occurring, on this site. They are not intended to cover every situation or the full range of conditions, species, and responses for the site.

State and transition model

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Standard diagram

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State 1
Reference State (minimally-managed)

As a result of a long history of human activity, the associations listed below, may in reality, reflect the current naturalized, minimally-managed state rather than the historic, pre-European settlement condition. Notice transition pathways are not always designated between some of the communities in the reference state because the differences in vegetation are more controlled by landscape position, rather than disturbances or management, or that the relationships are not understood. In addition, undisclosed successional plant community-types following disturbance may be included as community phases. Within the reference state, the plant communities are quite variable depending upon the size of the river system. Much of these sites within the active floodplain profile at the highest elevation and subject to the least flooding, have been converted to agriculture. Only small remnants still exist. The following plant communities may be found along medium to larger rivers systems: • Acer saccharum - Fraxinus spp. - Tilia americana / Matteuccia struthiopteris - Ageratina altissima Floodplain Forest (CEGL006114) (Translated Name: Sugar Maple - Ash species - American Basswood / Ostrich Fern - White Snakeroot Floodplain Forest) [Common Name: Terrace Hardwood Floodplain Forest]) • Acer saccharinum - Ulmus americana / Onoclea sensibilis Floodplain Forest (CEGL006001) (Translated Name: Silver Maple - American Elm / Sensitive Fern Floodplain Forest [Common Name: Northeastern Silver Maple - Elm Floodplain Forest]) (Source: NatureServe 2020)

Community 1.1
Sugar Maple - Ash species - American Basswood / Ostrich Fern - White Snakeroot Floodplain Forest

Acer saccharum - Fraxinus spp. - Tilia americana / Matteuccia struthiopteris - Ageratina altissima Floodplain Forest (CEGL006114) (Translated Name: Sugar Maple - Ash species - American Basswood / Ostrich Fern - White Snakeroot Floodplain Forest) [Common Name: Terrace Hardwood Floodplain Forest]) The tree canopy dominants can vary from site to site, but are usually some combination of sugar maple (Acer saccharum), American basswood (Tilia americana), red oak (Quercus rubra), American elm (Ulmus americana), white ash (Fraxinus americana) green ash (Fraxinus pennsylvanica), and black cherry (Prunus serotina). Minor canopy associates include silver maple (Acer saccharinum), black walnut (Juglans cinerea), black ash (Fraxinus nigra), and red maple (Acer rubrum). Unlike lower-elevation floodplain forests, a subcanopy is often present. Shrubs are occasional, but do not form high cover. Shrubs include American hazelnut (Corylus americana), nannyberry (Viburnum lentago), and chokecherry (Prunus virginiana). Vines such as poison ivy (Toxicodendron radicans), creepers (Parthenocissus spp.), or grapes (Vitis spp.) may be locally common. The herb layer can be well-developed and seasonally variable, features ostrich fern (Matteuccia struthiopteris) and a mixture of other ferns, forbs, and graminoids. Characteristic species include white snakeroot (Ageratina altissima [= Eupatorium rugosum]), ramps (Allium tricoccum) meadow garlic (Allium canadense), lady fern (Athyrium filix-femina), blue cohosh (Caulophyllum thalictroides), gracefull sedge (Carex gracillima), greater bladder sedge (Carex intumescens), longbeak sedge (Carex sprengelii), silvery false spleenwort (Deparia acrostichoides), common eastern wildrye (Elymus virginicus), eastern riverbank wildrye (Elymus riparius), Wiegand’s wildrye (Elymus wiegandii [= Elymus canadensis var. wiegandii]), sensitive fern (Onoclea sensibilis), bloodroot (Sanguinaria canadensis), zipzag goldenrod (Solidago flexicaulis), common wrinkleleaf goldenrod (Solidago rugosa) and giant smooth goldenrod (Solidago gigantea). in addition to abundant spring ephemerals in the early growing season. Non-native plants, such as creeping Jenny (Lysimachia nummularia), ground ivy (Glechoma hederacea), and dame’s rocket (Hesperis matronalis), may occur in disturbed areas. (Source: NatureServe 2020 [accessed April 2020], USNVC 2019 [accessed April 2022]). Cross-referenced plant community concepts and relationship (by political State or otherwise): CT – Acer saccharum - Fraxinus americana / Carex sprengelii Floodplain Forest [CT] (Metzler and Barrett, 2006) MA – High Terrace Floodplain Forest [MA] (Swain, 2020) NH – Sugar Maple - Silver Maple - White Ash Floodplain Forest [NH] (Spurduto, 2012) VT – Sugar Maple Floodplain Forest (broader) [VT] (Thompson and Sorenson, 2000)

Community 1.2
Silver Maple - American Elm / Sensitive Fern Floodplain Forest

Acer saccharinum - Ulmus americana / Onoclea sensibilis Floodplain Forest (CEGL006001) (Translated Name: Silver Maple - American Elm / Sensitive Fern Floodplain Forest [Common Name: Northeastern Silver Maple - Elm Floodplain Forest]) Silver maple (Acer saccharinum) dominates the tree canopy along with subcanopy trees: slippery elm (Ulmus rubra), American elm (Ulmus americana), black cherry (Prunus serotina), and green ash (Fraxinus pennsylvanica). Eastern cottonwood (Populus deltoides) sporadically in more sandy soils. At higher elevations in the floodplain, more shrubs are present, including northern arrowwood (Viburnum recognitum), southern arrowwood (Viburnum dentatum), northern spicebush (Lindera benzoin), and red-osier dogwood (Swida [=Cornus] sericea). The herb layer is conspicuously dominated by sensitive fern (Onoclea sensibilis) interspersed with lesser amounts of sweet wood-reed (Cinna arundinacea), white avens (Geum canadense), white turtlehead (Chelone glabra), jewelweed (Impatiens capensis), fringed sedge (Carex crinite), hop sedge (Carex lupulina), and Gray’s sedge(Carex grayi). (Source: NatureServe 2020 [accessed April 2020], USNVC 2019 [accessed April 2020]). Cross-referenced plant community concepts and relationship (by political State or otherwise): CT – Acer saccharum / Onoclea sensibilis Floodplain Forest (Metzler and Barrett, 2006) MA – Transitional Floodplain Forest (Undetermined) (Swain, 2020)

Community 1.3
Successional forest/shrublands

(to be developed)

Community 1.4
Sucessional/[Abandoned] Field/Meadow

to be developed

Pathway P1.1A
Community 1.1 to 1.3

disturbance

Pathway P1.2A
Community 1.2 to 1.3

disturbance

Pathway P1.3A
Community 1.3 to 1.1

vegetation development/succession

Pathway P1.3B
Community 1.3 to 1.2

vegetation development/succession

Pathway P1.3C
Community 1.3 to 1.4

Pathway P1.4A
Community 1.4 to 1.3

Abandonment, succession

State 2
Semi-natural State

The Semi-natural State would expect plant communities where ecological processes are primarily operating with some land conditioning in the past or present, e.g., managed forests, or plant communities that are an artifact of land management e.g., predominately invasive plants.

Community 2.1
Managed Forest/Woodland

(to be developed)

Community 2.2
Invasive Plants

(to be developed)

Pathway P2.1A
Community 2.1 to 2.2

invasive plant establishment, vegetation development/succession

Pathway P2.2A
Community 2.2 to 2.1

invasive plant management, forest management

Conservation practices

Forest Stand Improvement
Invasive Plant Species Control

State 3
Cultural State

The Cultural State would expect the ecological site to be very strongly conditioned by land management, i.e., transformed/converted to cultivated, pasture, or plantation.

Community 3.1
Cultivated

(to be developed)

Community 3.2
Pasture

(to be developed)

Community 3.3
Plantation

(to be developed)

Transition T1A
State 1 to 2

forest management, disturbance, invasive plant establishment

Conservation practices

Forest Stand Improvement

Transition T1B
State 1 to 3

cutting, land clearing, plant establishment

Conservation practices

Land Clearing

Restoration pathway R2A
State 2 to 1

plant removal, plant establishment, successional management

Conservation practices

Restoration and Management of Natural Ecosystems
Native Plant Community Restoration and Management
Invasive Plant Species Control

Transition T2A
State 2 to 3

cutting, land clearing, plant establishment

Conservation practices

Land Clearing

Restoration pathway R3A
State 3 to 1

plant removal, plant establishment, successional management

Conservation practices

Restoration and Management of Natural Ecosystems
Native Plant Community Restoration and Management
Invasive Plant Species Control

Restoration pathway R3B
State 3 to 2

forest management, disturbance, invasive plant establishment

Conservation practices

Restoration and Management of Natural Ecosystems
Native Plant Community Restoration and Management

Additional community tables

Supporting information

Inventory data references

Site Development and Testing Plan
Future work is needed, as described in a future project plan, to validate the information presented in this provisional ecological site description. Future work includes field sampling, data collection and analysis by qualified vegetation ecologists and soil scientists. As warranted, annual reviews of the project plan can be conducted by the Ecological Site Technical Team. A final field review, peer review, quality control, and quality assurance reviews of the ESD are necessary to approve a final document.

References

. 2021 (Date accessed). USDA PLANTS Database. http://plants.usda.gov.

Other references

Bailey, R. 2014. Ecoregions: the ecosystem geography of the oceans and continents. Second Edition. New York, NY: Springer-Verlag.

Beck, H.E., N.E. Zimmermann, T.R. McVicar, N. Vergopolan, A.Berg, E.F. Wood. 2018. Present and future Köppen-Geiger climate classification maps at 1-km resolution. Scientific Data 5(1):1-12.

Cleland, D.T., J.A. Freeouf, J.E. Keys, G.J. Nowacki, C.A.Carpenter, and W.H.McNab. 2007. Ecological Subregions: Sections and Subsections for the conterminous United States. [Map. presentation scale 1:3,500,000, colored; A.M. Sloan, cartographer] General Technical Report WO-76D. U.S. Department of Agriculture, Forest Service, Washington, DC. (https://www.fs.fed.us/research/publications/misc/73326-wo-gtr-76d-cleland2007.pdf).

Comer, P., D. Faber-Langendoen, R. Evans, S. Gawler, C. Josse,G. Kittel, S. Menard, M. Pyne, M. Reid, K. Schulz, and K. Snow.2003. Ecological Systems of the United States: A Working Classification of US Terrestrial Systems. NatureServe, Arlington, VA. (https://www.natureserve.org/sites/default/files/pcom_2003_ecol_systems_us.pdf).

Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe, 1979. Classification of wetlands and deepwater habitats of the United States. FWS/OBS-79/31. Office of Biological Services, Fish and Wildlife Service, US Department of the Interior, Washington, DC.. (https://www.fws.gov/wetlands/documents/classification-of-wetlands-and-deepwater-habitats-of-the-united-states.pdf).

FGDC (Federal Geographic Data Committee). 2008. National Vegetation Classification Standard, Version 2. VGDC‐STD‐005‐2008 (Version 2). FGDC Vegetation Subcommittee, Reston, Virginia. (https://www.fgdc.gov/standards/projects/vegetation/NVCS_V2_FINAL_2008-02.pdf).

Janowiak, M.K., A.W. D'Amato, C.W. Swanston, L. Iverson, F.R. Thompson, W.D Dijak, S. Matthews, M.P. Peters, A. Prasad, J.S. Fraser, J.S. L.A. Brandt, P. Butler-Leopold, S.D. Handler, P.D. Shannon, D. Burbank, J. Campbell, C. Cogbill, M.J. Duveneck, M.R. Emery, N. Fisichelli, J. Foster, J Hushaw, L. Kenefic, A. Mahaffey, T/L. Morelli, N.J. Reo, P.G. Schaberg, K R. Simmons, A. Weiskittel, S. Wilmot, D. Hollinger, E. Lane, L. Rustad, and P.H. Templer. 2018. New England and northern New York forest ecosystem vulnerability assessment and synthesis: a report from the New England Climate Change Response Framework project. General Technical Report NRS-173, US Department of Agriculture, Forest Service, Northern Research Station. Newtown Square, PA.

Marks, C.O., K.H. Nislow, and F.J. Magilligan. 2014. Quantifying flooding regime in floodplain forests to guide river restoration. Elementa: Science of the Anthropocene 2:1-15.

Metzler, K.J. and J.P. Barrett. 2006. The Vegetation of Connecticut: A Preliminary Classification. State Geological and Natural History of Connecticut, Department of Environmental Protection, Hartford, CT.

Metzler, K.J. and A.W.H. Damman. 1985. Vegetation patterns in the Connecticut River flood plain in relation to frequency and duration of flooding. Naturaliste Canadien 112(4):535-547.

NatureServe 2020. NatureServe Explorer: An Online Encyclopedia of Life [web application]. NatureServe, Arlington, VA. Available: http://explorer.natureserve.org (Accessed: April 2020).
PRISM Climate Group, Oregon State University. Available http://prism.oregonstate.edu, (created February 26, 2013).

PRISM Climate Group, Oregon State University. Available http://prism.oregonstate.edu, (created February 26, 2013).

Soil Survey Staff-USDA-NRCS [United States Department of Agriculture, Natural Resources Conservation Service] 2016. National Soils Information Service (NASIS Data Model Version7.3.4). Lincoln, NE. Available description: https://www.nrcs.usda.gov/wps/portal/nrcs/detailfull/soils/survey/tools/?cid=nrcs142p2_053552 (Accessed January 2020).

Sperduto, D.D. and W.F. Nichols. 2011. Natural Communities of New Hampshire. 2nd Ed. New Hampshire Natural Heritage Bureau, Concord, New Hampshire Publication. University of New Hampshire Cooperative Extension, Durham, NH.

Swain, P.C. 2020. Classification of the Natural Communities of Massachusetts. Massachusetts Division of Fisheries and Wildlife, Westborough, MA.

Thompson, E. H., and E.R. Sorenson. 2000. Wetland, woodland, wildland. Vermont Department of Fish and Wildlife and the Nature Conservancy. University Press of New England, Hanover, NH.

USDA, NRCS [United States Department of Agriculture, Natural Resources Conservation Service]. 2022. The PLANTS Database (http://plants.usda.gov, 10/03/2023). National Plant Data Team, Greensboro, NC USA.

USDA-NRCS [United States Department of Agriculture, Natural Resources Conservation Service]. 2006. Land Resource Regions and Major Land Resource Areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. (https://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_051845.pdf).

USNVC [United States National Vegetation Classification]. 2019. United States National Vegetation Classification Database, V2.03. Federal Geographic Data Committee, Vegetation Subcommittee, Washington DC. http://usnvc.org (accessed April 2020).

Contributors

Nels Barrett, Ph.D.

Approval

Nels Barrett, 9/27/2024

Acknowledgments

Michael Margo and tech team assisted w/drafts.

Rangeland health reference sheet

Interpreting Indicators of Rangeland Health is a qualitative assessment protocol used to determine ecosystem condition based on benchmark characteristics described in the Reference Sheet. A suite of 17 (or more) indicators are typically considered in an assessment. The ecological site(s) representative of an assessment location must be known prior to applying the protocol and must be verified based on soils and climate. Current plant community cannot be used to identify the ecological site.

Author(s)/participant(s)
Contact for lead author
Date	11/24/2024
Approved by	Nels Barrett
Approval date
Composition (Indicators 10 and 12) based on	Annual Production

Indicators

Number and extent of rills:
Presence of water flow patterns:
Number and height of erosional pedestals or terracettes:
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
Number of gullies and erosion associated with gullies:
Extent of wind scoured, blowouts and/or depositional areas:
Amount of litter movement (describe size and distance expected to travel):
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
Functional/Structural Groups (list in order of descending dominance by above-ground annual-production or live foliar cover using symbols: >>, >, = to indicate much greater than, greater than, and equal to):

Dominant:

Sub-dominant:

Other:

Additional:
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
Average percent litter cover (%) and depth ( in):
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
Potential invasive (including noxious) species (native and non-native). List species which BOTH characterize degraded states and have the potential to become a dominant or co-dominant species on the ecological site if their future establishment and growth is not actively controlled by management interventions. Species that become dominant for only one to several years (e.g., short-term response to drought or wildfire) are not invasive plants. Note that unlike other indicators, we are describing what is NOT expected in the reference state for the ecological site:
Perennial plant reproductive capability:

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Ecological site F145XY001MA

Silty High Floodplain

Last updated: 9/27/2024 Accessed: 11/24/2024

General information

MLRA notes

Classification relationships

Ecological site concept

Associated sites

Similar sites

Table 1. Dominant plant species

Ecosystem states

State 1 submodel, plant communities

State 2 submodel, plant communities

State 3 submodel, plant communities

Natural Resources
Conservation Service

Last updated: 9/27/2024
Accessed: 11/24/2024