A s8lt water blowout 8t 8n oil drilling rite in 1982 in 8 bodhmds UCI of western North D8kot8 aused l~vere d8nuge to the native vegeMion. A study WM initkd to me88ure the effect of reclrm8tion on soils 8nd reveget8tion of the 8ffected 8re8. Burl cover 8nd pl8nt density were me88ured on 8 portion Of the COnt8miMted ue8 followhag the blowout md in 1984 following recl8m8tk-m of the site. The contamin8ted soil ~8s rCel8hned by rdding C8CI? to irrig8tion wrter which ~86 u8ed to le8ch the upper 15 cm of the soil profile. In July 1982, 8fter the blowout, D&tichifs stricta WM essent&lly the only species growing 8t the site. In July 1984, following re&nutlon, speck with the higheet percent b8s81 cover on the reelrimed bilf were Agropyron sm&hU(Rydb.), Boutebua gmdlis (H.E.K. L8g.), 8nd D&t&h& stdctu (Torr.) Rydb. On the unreclrimed half Agropyron smithii, Dist&hli$stricta, L~pidiuw &ni~floras Schnd., 8nd OpunHcr poipmtha HOW. h8d the highat percent baral cover. In 1984, b8881 cover of the gr88sa? on the reelrimed rite ~8s two-third8 of th8t on 8 Site with no visible d8m8ge from the 88lt water. The percent bue ground w8a still 25% on the reclaimed half of the contaminated site in 1984, but h8d incre88ed on the unreclrimed b8lf to 43% laving the surfrce open to potenti8lly serious erosion. Soil d8t8 indic8ted th8t recl8m8tion h8d successfully reduced eodium adsorption ntio (SAR) v8h1ea in the rurf8ce 15 cm to more 8cceptrble levele for veget8tion recovery-. Key Wor& re&m8tion, oil well, gr8seeq forbe, cover
The suitability of soils for salvage and reclamation can be limited by the level of soluble salts. In Montana, surface soil materials with electrical conductivities (EC) in excess of 4 mmhos/cm, or subsoil materials with conductivities in excess of 6 to 8 mmhos/cm are considered unsuitable by the regulatory y agency •. Due to the.high variability of soil EC, it becomes necessary to•monitor EC levels prior to salvage •. Pre-salvage monitoring of soils for soluble salts by conventional sampling and laboratory analysis can be expensive and time consuming. A method for conducting pre-salvage surveys of soil salinity is presentea which makes use of an aboveground electromagnetic induction soil conductivity metJ!r manufactered by Gepnics Limited. The instrument facilitates rapid and extensive coverage of the landscape and field readings of EC, which correlate well with actual soil EC, can be used to adjust salvage depths.
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