ESD Printable Report Page 1 of 40 United States Department of Agriculture Natural Resources Conservation Service Ecological Site Description Section l: Ecological Site Characteristics Ecological Site Identification and Concept Site stage: Provisional Provisional: an ESD at the provisional status represents the lowest tier of documentation that is releasable to the public. It contains a grouping of soil units that respond similarly to ecological processes. The ESD contains 1) enough information to distinguish it from similar and associated ecological sites and 2) a draft state and transition model capturing the ecological processes and vegetative states and community phases as they are currently conceptualized. The provisional ESD has undergone both quality control and quality assurance protocols. It is expected that the provisional ESD will continue refinement towards an approved status. Site name: Thin Loamy / Schizachyrium scoparium - Hesperostipa spartea ( / LITTLE BLUESTEM - PORCUPINEGRASS) Site type: Rangeland Site ID: R055BY068ND Major land resource area (MLRA): 055B-Central Black Glaciated Plains https://esis.sc.egov.usda.gov/ESDReport/fsReportPrt.aspx?id=R055BY068ND&rptLevel=... 5/21/2016 ESD Printable Report Page 2 of 40 Physiographic Features This site occurs on gently undulating to rolling and steep uplands Landform: (1) Till plain (2) Terrace (3) Lake plain Minimum Maximum Elevation (feet): 1000 2100 Slope (percent): 2 30 Water table depth (inches): 36 80 Flooding Frequency: None Rare Duration: None Brief Ponding Runoff class: Low Medium https://esis.sc.egov.usda.gov/ESDReport/fsReportPrt.aspx?id=R055BY068ND&rptLevel=... 5/21/2016 ESD Printable Report Page 3 of 40 Aspect: No Influence on this site Climatic Features MLRA 55B is considered to have a continental climate – cold winters and hot summers, low humidity, light rainfall, and much sunshine. Extremes in temperature are characteristic. The climate is the result of this MLRA’s location in the geographic center of North America. There are few natural barriers on the northern Great Plains. The air masses move unobstructed across the plains and account for rapid changes in temperature. Annual precipitation ranges from 16 to 21 inches per year. The normal average annual temperature is about 41.5° F. January is the coldest month with average temperatures ranging from about 2° F (Maddock, ND) to about 11° F (Mellette, SD). July is the warmest month with temperatures averaging from about 67° F (Maddock, ND) to about 73° F (Redfield 2 NE, SD). The range of normal average monthly temperatures between the coldest and warmest months is about 64° F. This large annual range attests to the continental nature of this MLRA's climate. Winds average about 11 miles per hour annually, ranging from about 13 miles per hour during the spring to about 10 miles per hour during the summer. Daytime winds are generally stronger than nighttime and occasional strong storms may bring brief periods of high winds with gusts to more than 50 miles per hour. Growth of native cool-season plants begins in late March and continues to early to mid July. Native warm-season plants begin growth in mid May and continue to the end of August. Green up of cool-season plants can occur in September and October when adequate soil moisture is present. Averaged Frost-free period (days): 129 Freeze-free period (days): 146 Mean annual precipitation (inches): 21.00 Monthly Precipitation (Inches): Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High 0.68 0.56 1.22 2.09 2.87 3.84 3.19 2.36 2.01 1.48 0.83 0.51 Low 0.38 0.27 0.61 1.02 2.35 3.20 2.58 1.82 1.56 1.04 0.49 0.35 https://esis.sc.egov.usda.gov/ESDReport/fsReportPrt.aspx?id=R055BY068ND&rptLevel=... 5/21/2016 ESD Printable Report Page 4 of 40 4 inches 3 inches 2 inches 1 inches 0 inches Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Monthly Temperature (°F): Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec High 23.0 28.6 41.0 58.5 70.7 79.8 86.6 85.4 74.9 61.8 42.3 28.7 Low -7.9 -1.4 10.8 28.1 39.1 49.7 54.1 51.9 41.8 31.5 16.7 1.4 102 °F 82 °F 62 °F 42 °F 22 °F 2 °F -17 °F Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Climate stations: (1) ND1224, Butte. Period of record 1948-2007 5 inches (2) ND1360 Carrington Period of Record 1948-2004 https://esis.sc.egov.usda.gov/ESDReport/fsReportPrt.aspx?id=R055BY068ND&rptLevel=... 5/21/2016 ESD Printable Report Page 5 of 40 (3) ND3117 Forman 5 SSE Period of Record 1948-2007 (4) ND4013 Harvey Period of Record 1948-2007 (5) ND4937 LaMoure Period of Record 1948-2007 (6) ND5434 Maddock Period of Record 1948-2004 (7) SD5456 Mellette Period of Record 1896-2007 (8) SD7052 Redfield 2 NE Period of Record 1949-2007 Influencing Water Features No significant water features influence this site. Representative Soil Features These are very deep, moderately well to well drained, and moderately coarse to moderately fine textured soils. These soils have strongly calcareous subsoil or are calcareous to the surface. Saturated hydraulic conductivity is moderate to moderately slow and available water capacity is high. Salinity is none and sodicity is none. This site is on side slopes or ridges on gently sloping to very steep residual uplands and till plains. Slope ranges from 0 to 60 percent. It is not uncommon to have some pedestalling of plants due to the inherent instability of the soils. Water flow paths are broken, irregular in appearance or discontinuous. There is a risk of rills and eventually gullies if vegetative cover is not adequate. Cryptobiotic crusts are present. Sub-surface soil layers are non-restrictive to water movement and root penetration. These soils are highly susceptible to water erosion and to a lesser degree wind erosion. The hazard of water erosion increases where vegetative cover is not adequate. Loss of the soil surface layer can result in a shift in species composition and/or production. Major soil series correlated to this ecological site can be found in Section II of the Natural Resources Conservation Service Field Office Technical Guide or the following web sites: http://www.nrcs.usda.gov/technical/efotg/ Access Web Soil Survey (http://websoilsurvey.nrcs.gov/app/) for specific local soils information. Surface texture: (1) Loam (2) Silt loam (3) Silty clay loam Subsurface texture group: Loamy Minimum Maximum Surface fragments <=3" (% cover): 0 10 https://esis.sc.egov.usda.gov/ESDReport/fsReportPrt.aspx?id=R055BY068ND&rptLevel=... 5/21/2016 ESD Printable Report Page 6 of 40 Surface fragments >3" (% cover): 0 50 Subsurface fragments <=3" (% volume): 0 15 Subsurface fragments >3" (% volume): 0 10 Drainage class: Moderately well drained to well drained Permeability class: Moderately slow to moderate Minimum Maximum Depth (inches): 20 80 Available water capacity (inches): 9.00 12.00 Electrical conductivity (mmhos/cm): 0 4 Sodium adsorption ratio: 0 0 Calcium carbonate equivalent (percent): 0 45 Soil reaction (1:1 water): 6.6 8.4 Plant Communities Ecological Dynamics of the Site The site developed under Northern Great Plains climatic conditions, and included natural influence of large herding herbivores and frequent fire. Changes will occur in the plant communities due to weather fluctuations and/or management actions. Under adverse impacts, a slow decline in vegetative vigor and composition will occur. Under favorable conditions the site has the potential to resemble the reference state. Interpretations for this site are based on 1.1 Bluestem/ Needlegrass/ Sideoats Grama plant community. The 1.1 Bluestem/Needlegrass/Sideoats Grama plant community has been determined by study of rangeland relic areas, areas protected from excessive disturbance, and areas under long-term rotational grazing regimes. Trends in plant community dynamics ranging from heavily grazed to lightly grazed areas, seasonal use pastures, and historical accounts also have been considered. Community phases, community pathways, states, transitions, thresholds and restoration pathways have been determined through similar studies and experience. The natural disturbance regime consisted of frequent fires caused both by natural and Native American ignition sources. These fires occurred during any season of the year, but were concentrated in the spring and late summer or early fall. Lightening fires occurred most frequently in July and August while fires started by Native Americans occurred in April, September and October. Large ungulate grazing was heavy and occurred often, but usually for short durations. Grazing may have been severe when occurring after a fire event. The grazing and fire interaction especially when coupled with drought events, set up the dynamics discussed and displayed in the following state and transition diagram and descriptions. This ecological site has been grazed by domestic livestock since introduced into the area. The introduction of domestic livestock and the use of fencing and reliable water sources have radically changed the disturbance regime of this site. Heavy continuous grazing and/or continuous seasonal (spring) grazing, without adequate recovery periods following https://esis.sc.egov.usda.gov/ESDReport/fsReportPrt.aspx?id=R055BY068ND&rptLevel=... 5/21/2016 ESD Printable Report Page 7 of 40 each grazing occurrence causes this site to depart from the reference plant community. Species such as western wheatgrass and blue grama and, if present, Kentucky bluegrass will initially increase. Little bluestem will initially remain in the plant community but will decline with continued disturbance. Western wheatgrass will increase initially and then begin to decrease. Porcupine grass and/or green needlegrass, plains muhly and sideoats grama will decrease in frequency and production.