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Establishing Permanent Vegetation after Highway Construction.
| 题名： | Establishing Permanent Vegetation after Highway Construction. |
| 作者： | Poe, R.; Schacht, W.; Soper, J.; Wienhold, C. |
| 关键词： | Biological Processes; Environmental Restoration; Highway Construction; Nebraska; Percipitation; Plants; Sediments; Soil Erosion; Soil Stabilization; Vegetation |
| 摘要： | The Nebraska Department of Roads (NDOR) has considerable challenges stabilizing soils on highway shoulders following construction activities. Exposed soils can be prone to erosion and offsite sediment flow during precipitation events. NDOR primarily uses perennial vegetation in concert with erosion control products to stabilize exposed soils. Unfortunately, establishment is often slow or unsuccessful because of a number of environmental and management variables. Once established, the stands of seeded species and some volunteer species provide good ground cover and persist. The main issue is the inconsistent time frame from the exposed site to a fully established and stable site. NDOR staff members have suggested a few possible reasons for the slow establishment: inconsistent use of good topsoil and soil amendments, bare ground with limited plant litter/soil organic matter (mulch), poor soil moisture conditions, ineffective use of cover crops and disturbance of recently seeded areas by high levels of truck and agricultural equipment traffic. In some cases, topsoil is stockpiled and later re-applied to the site. However, this process does not replace all of the nutrients, soil structure and biological processes of the pre-construction soil conditions. While many of these conditions are the result construction activities, NDOR staff has recognized that current re-vegetation techniques could be improved to consistently produce stabilized roadsides. |
| 报告类型： | 科技报告 |
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