2002 Natural Resources Management

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the more disturbed areas, particularly the grasses smooth brome and Kentucky bluegrass. Also, Cyprus spurge, a nonnative forb is well established in one area near the rail right -of -way. Some of the prairie species present are big bluestem, little bluestem, prairie cordgrass, sky blue aster, harebell, windflower, northern bedstraw, Culver's root, and three - seeded mercury. The southwest portion of this community has a more typical structure for oak woodlands with large, open -grown oaks as the defining feature. A portion of this area is maintained as active park area, while a small area is not maintained. The unmaintained area has a moderately thick layer of buckthorn, and ground layer species similar to the portion of this community on the northeast side of the lake. Because of the amount of past disturbance and the recent colonization of the area by weedier trees and nonnatives, this community received a low rank. Despite this, it has moderately good potential for improvement, partly because the infrastructure present in the park enables active management. The recommendations below assume management toward a savanna and prairie complex away from the lake. Community Activity Priority Estimated Cost Comments CP -U1 Remove High Approximately Cut and treat all stumps with 25 -50% Buckthorn and $2,500, or 100- solution of Roundup or Garlon. Stack and other nonnative 200 volunteer burn brush in winter. Cut before prescribed shrubs hours burning in any particular area. Also plant with native prairie /savanna flowers and grasses where bare soil exists. CP -U1 Reintroduce High $1,000 - 200 Highest priority burn is between trail and Prescribed Fire per event railroad, second priority is between trails and lake. Burning should not be conducted until brush clearing is completed. Burn 2 -3 times in first ten years and every 5 -10 years as community stabilizes. Conduct concurrently with seeding and cutting Table continues City of Roseville 86 Parks Natural Resource Management