1. Changes in soil organic carbon, nitrogen and sulphur stocks due to the conversion of natural forest into tree plantations (Pinus patula and Eucalyptus globulus) in the highlands of Ethiopia;Ashagrie;World Resour. Rev.,2003
2. Litter mass loss rates in pine forests of Europe and eastern United States: Some relationships with climate and litter quality;Berg;Biogeochemistry,1993
3. Long-term decomposition of successive organic strata in a nitrogen saturated Scots pine forest soil;Berg;For. Ecol. Manage.,1998
4. FAO 1997. FAO/UNESCO soil map of the world, revised legened with corrections and updates. World soil resources, Report No. 60, ISRIC, Wageningen, The Netherlands.
5. Acid precipitation and soil solution chemistry within a maple-birch forest in Canada;Foster;For. Ecol. Manage.,1985