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NRI 2 2009 Colorado Adams
<br /> NRI 3 2008 Colorado Cheyenne
<br /> NRI 1 2008 Colorado Elbert
<br /> NRI 1 2008 Colorado Kit Carson
<br /> NRI 1 2013 Colorado Kit Carson
<br /> NRI 2 2010 Colorado Lincoln
<br /> NRI 3 2013 Colorado Lincoln
<br /> NRI 3 2011 Colorado Morgan
<br /> NRI 4 2012 Colorado Morgan
<br /> NRI 1 2007 Colorado Weld
<br /> NRI 3 2011 Colorado Weld
<br /> NRI 4 2009 Colorado Weld
<br /> Hierarchical Classification Relationships
<br /> MLRA 67B is in the Colorado Piedmont and Raton Sections of the Great Plains Province(USDA,2006).The MLRA is further defined by
<br /> LRUs A,B,and C.Features such as climate,geology,landforms,and key vegetation further refine these LRU concepts,and are described
<br /> in other sections of the Ecological Site Description(ESD).
<br /> NOTE:To date,these LRU's are DRAFT.
<br /> LRU A is the northeast portion of MLRA 67B,to an extent of approximately 9.0 million acres.Most of the LRU is rangeland,and includes the
<br /> Pawnee National Grassland,managed by the U.S.Forest Service.Dryland winter wheat/fallow rotations(that may include dryland corn,
<br /> sunflowers,and/or sorghum)are grown in most counties.Irrigated cropland is utilized in the South Platte Valley.Small acreage and urban
<br /> ownership are more concentrated on the Front Range.This LRU is found in portions of Adams,Arapahoe,Elbert,Kit Carson,Larimer,
<br /> Lincoln,Logan,Washington,and Weld counties.Other counties include Boulder,Cheyenne,Denver,Jefferson,and Yuma.The soil moisture
<br /> regime is Aridic Ustic.The mean annual air temperature(MAAT)is 50'F.
<br /> LRU B is in the southeast portion of MLRA 67B(2.6 million acres)and include portions of Baca,Bent,Cheyenne,Kiowa,Las Animas,and
<br /> Prowers counties.Most of the LRU remains agricultural.Most of LRU B is rangeland and includes the Comanche National Grassland.
<br /> Dryland winter wheat/fallow rotations(that may include dryland corn,sunflowers,and/or sorghum)are grown.Irrigated cropland is used in
<br /> the Arkansas Valley.The soil moisture regime is Aridic Ustic and the MAAT is 52°F.
<br /> LRU C occurs in portions of Morgan and Weld counties(approximately 1.2 million acres).Most of LRU C is in rangeland.Dryland winter
<br /> wheat/fallow rotations(that may include dryland corn,sunflowers,and/or sorghum)are grown.The soil moisture regime is Ustic Aridic and
<br /> the MAAT is 48°F.
<br /> REVISION NOTES:
<br /> The Sandy Plains site was developed by an earlier version of the Sandy ESD(2004,re-named Sandy Plains in 2007).This earlier version of
<br /> the Sandy ESD(2005)was based on input from NRCS(formerly Soil Conservation service)and historical information obtained from the
<br /> Loamy Plains range site descriptions(1975,revised 1980).This ESD meets the Provisional requirements of the National Ecological Site
<br /> Handbook(NESH).This ESD will continue refinement towards an Approved status according to the NESH.
<br /> Other References
<br /> Data collection for this ecological site was done in conjunction with the progressive soil surveys within the 67B Central High Plains
<br /> (Southern Part)of Colorado.It has been mapped and correlated with soils in the following soil surveys:Adams County,Arapahoe County,
<br /> Baca County,Bent County,Boulder County,Cheyenne County,El Paso County Area,Elbert County,Eastern Part,Kiowa County,Kit Carson
<br /> County,Larimer County Area,Las Animas County Area,Lincoln County,Logan County,Morgan County,Prowers County,Washington
<br /> County,Weld County,Northern Part,and Weld County,Southern Part.
<br /> Agricultural Applied Climate Information system(AgACIS),powered by ACIS NOAA Regional Climate Centers,Frost/Freeze dates
<br /> (1971-2000)http://agacis.rcc-acis.org Accessed February,2017
<br /> Andrews,R.and R.Righter.1992.Colorado Birds.Denver Museum of Natural History,Denver,CO.442
<br /> Armstrong,D.M.1972.Distribution of mammals in Colorado.Univ.Kansas Museum Natural History Monograph#3.415.
<br /> Butler,LID.,J.B.Cropper,R.H.Johnson,A.J.Norman,G.L.Peacock,P.L.Shaver and K.E.Spaeth.1997,revised 2003.National Range and
<br /> Pasture Handbook.National Cartography and Geospatial Center's Technical Publishing Team:Fort Worth,TX.http://www.glti.nres.usda.gov
<br /> /technical/publications/nrph.html Accessed August 2015
<br /> Cleland,D.,P.Avers,W.H.McNab,M.Jensen,R.Bailey,T.King,and W.Russell.1997.National Hierarchical Framework of Ecological
<br /> Units,published in Ecosystem Management:Applications for Sustainable Forest and Wildlife Resources,Yale University Press
<br /> Colorado Climate Center Monthly Data Access(1981-2010)Total Monthly Precipitation http://ccc.atmos.colostate.edu/cgi-bin/monthlydata.pl
<br /> Accessed February,2017
<br /> Colorado Parks&Wildlife.Grassland Species Plan(2003)http://cpw.state.co.us/learn/Pages/GrasslandSpecies.aspx Accessed March,
<br /> 2017
<br /> Colorado Parks&Wildlife.Quick Key to Amphibians and Reptiles of Colorado.2013.Colorado Parks&Wildlife,Denver,CO.
<br /> cpw.state.co.us
<br /> Cooperative climatological data summaries.NOAA.Western Regional Climate Center:Reno,NV.Web.http://www.wrcc.dri.edu/climatedata
<br /> /climsum Accessed February,2017
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