The main aim of this study is to assess the recovery of the forest ecosystem in 15-year-old (midterm) hybrid aspen plantations on a reclaimed oil shale quarry.
Repeated monitoring of the main forest ecosystem components (tree growth, soil properties and understory plant cover) was carried out to describe ecosystem recovery on a reclaimed oil shale quarry.
Reclaimed or reprocessed oils will not be acceptable, nor will any oil which has been blended with processed or reclaimed oil
The new entity will rework and put in to production reclaimed oil
and gas wells, with the first target area being the Eastern Texas.
* Illegal refining and subs-standard production of reclaimed oil
* Irrational use of reclaimed oil in lubricant production.
Contractors United used the reclaimed oil
as a fuel for its asphalt hot-mix plants.
The mean SLA (10.8 [m.sup.2] [kg.sup.-1]) of a 7-year-old black alder is comparable to the 12.3 [m.sup.2] [kg.sup.-1] found by Johansson  for young alders growing on abandoned farmland and the 13.3 [m.sup.2] [kg.sup.-1] calculated for a 20-year-old black alder growing on the reclaimed oil shale mining area .
Productivity of black alder (Alnus glutinosa (L.) Gaertn.) plantations on reclaimed oil shale mining detritus and mineral soils in relation to rhizosphere conditions.
The objectives of this study were: (i) to describe the early growth of hybrid aspen in two sites on reclaimed oil
shale opencast and compare it with the results from automorphic arable soils in two sites: in the same region with the quarry area and in South-Estonia; (ii) to study relations between tree growth, foliar and soil properties and define the most limiting growth factors for hybrid aspen in reclaimed quarry areas; (iii) to describe and compare the floristic diversity and vegetation structure in plantations established on reclaimed quarry and on abandoned agricultural land.
The present study was carried out in five planted stands: 4-yr-old and 27-yr-old black alder (Alnus glutinosa (L.) Gaertn.), 4-yr-old and 27-yr-old Scots pine (Pinus sylvestris L.) and 4-yr-old silver birch (Betula pendula Roth) stands on reclaimed oil shale opencast mining spoil and Calcaric Regosols [21, 22] (Table 1).
Productivity of black alder (Alnus glutinosa (L.) Gaertn.) plantations established on reclaimed oil shale mining spoil and mineral soils in relation to rhizosphere conditions // Oil Shale.