Effects of exotic tree plantations of teak (Tectona grandis) and gmelina (Gmelina arborea) on a forest soil in south‐western Nigeria
ABSTRACT The properties of soil under 15-year-old plantations of gmelina (Gmelina arborea) and teak (Tectona grandis) were compared with logged forest soil in south-western Nigeria. The soil was significantly denser in the 0–10 cm layer of plantation soil and total porosity less than that of forest soil. Organic carbon was significantly greater in the 0–10 cm layer of forest soil. Similarly, the concentrations of total N, exchangeable Ca, Mg and K were greater under forest soil, but the concentrations of available P were similar under all three ecosystems. The smaller organic carbon and nutrient content of plantation soil is mainly due to its more open organic matter and nutrient cycles and nutrient immobilization in the fast-growing exotics.
- Soil Science 12/1944; 59(1):39-46. · 1.05 Impact Factor
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ABSTRACT: The physical and chemical properties of soils under rubber plots of 1, 7, 11, 14 and 18 years of age were analysed and compared in order to examine the trend of change in the properties of soils under rubber over time. Changes in soil bulk density and total porosity during the first 18 years of rubber plantation establishment were slight. There was no significant increase in soil organic carbon and total nitrogen contents over time. Soil exchangeable calcium and magnesium declined in the 0–10 cm and 10–30 cm layers of the soils with increasing age of rubber plantation. Decline in the levels of exchangeable potassium was, however, confined to the top 10 cm of the soil profiles. Most of the observed decline in soil mineral-nutrients occurred during the first 11 years following rubber plantation establishment.Agricultural Systems 02/1987; · 2.50 Impact Factor