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- W1992044960 abstract "Abstract Since 1995 PDVSA environmental management policies for oil exploration and production activities (E&P), have encouraged significant research in order to safely dispose of drill cuttings (DC) in previously drained and consequently acidified wetland soils from the Orinoco upper Delta, due to the exposure of their underlying pyritic (FeS2) marine clays to more oxigenated environment. These soils with pH <3.5, high exchangeable Al (>15 meq/100g.), and low saturation of exchangeable bases (Ca, Mg), are commonly colonized by Cyperaceae weeds. In a field experiment located nearby Varadero de Manamo (Monagas state), the addition and tillage of DC in concentrations ranging from 200 to 1000 m3/ha, produced total reduction of exchangeable Al, as well as pH increase in the range of 5.6 to 6.9. During two years, floristic and successional changes were evaluated. It was observed a progressive substitution of the non palatable sedge cover by useful cattle and wildlife species (Leersia hexandra, Paspalum conjugatum, Oryza rufipogon, Cassia occidentalis, Cassia tora and Axonopus sp.). Net primary productivity changes in the range of 1.7 to 4.6 times over the control plots were found. Changes in soil chemistry, leaching and foliar accumulation of heavy metals are reported. These results show that drill cuttings are a useful resource in the reclamation of wetlands with acid-sulfate soils and for the improvement of regional biological productivity and diversity." @default.
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- W1992044960 date "1998-06-07" @default.
- W1992044960 modified "2023-09-26" @default.
- W1992044960 title "Edafic and Successional Changes Generated by Drill Wastes Application in Acid-sulfate Soils at the Upper Orinoco Delta." @default.
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- W1992044960 doi "https://doi.org/10.2118/48922-ms" @default.
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