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Articles by J. Goma-Tchimbakala
Total Records ( 4 ) for J. Goma-Tchimbakala
  J. Goma-Tchimbakala
  A comparative study was carried out in Mayombe, between the soil of natural forest and the soil under three Terminalia superba plantations of 7, 12 and 48 year-old. In each plantation type and natural forest composite soil samples were taken in 0-10 cm layer. The goal was to investigate the dynamic of total carbon and nitrogen in whole and soil aggregate fraction in order to assess the impact of reforestation on the soil fractions. Organic carbon was analyzed by the modified Walkey and Black method. Total nitrogen was determined using the Kjeldhal procedure. Statistically differences between the sites were tested using the Analysis of Variance (ANOVA). The results showed that in the surface soil the carbon content and total nitrogen were respectively 22.2 and 1.56 μg g-1 in the forest. The carbon content was between 14.9 and 23.5 mg g-1 while total nitrogen was between 1.31 and 2.24 μg g-1 in the plantations. The results also revealed that plantation aging had a marked impact on the total carbon and nitrogen concentration of soil aggregate fractions. The carbon and the nitrogen associated with the sand and the clay exhibited a significant increase. The carbon concentration was between 1.51 and 2.09 mg g-1 in the light aggregate fractions and between 0.95 and 1.04 mg g-1 in the organomineral aggregate fraction. The accumulation of total carbon in the whole soil and soil aggregate fractions and their increase during plantation aging suggested that the T. superba plantations could facilitate significant carbon storage.
  J. Goma-Tchimbakala
  .
  J. Goma-Tchimbakala and S. Makosso
  A comparative study was carried out in Mayombe, between the soil of natural forest and the soil under four Terminalia superba plantations of 7, 12, 32 and 48 year old. In each plantation type and natural forest composite soil samples were taken in 0-10, 10-20, 20-30, 30-40 and 40-50 cm layers. The goal was to assess the impact of reforestation on soil organic matter and its biological characteristics. Statistically differences between the sites were tested using the Analysis of Variance (ANOVA). The results showed that there was a general decrease of soil organic matter in the profile of all sites except in the 48 year old plantation for total nitrogen. In the surface soil the carbon content and total nitrogen were respectively, 22.2 mg g-1 and 1.56 μg g-1 in the forest. The carbon content was between 14.9 and 23.5 mg g-1 while total nitrogen was between 1.31 and 2.24 μg g-1 in the plantations. The microbial biomass carbon (Cmic) was 732 μg g-1 soil in the forest, it varied between 461 and 740 μg g-1 in the plantations. The metabolic quotient (qCO2) was between 3.6 mg C-CO2 mg-1 Cmic day-1 and 4.8 mg C-CO2 mg-1 Cmic day-1 in plantations. The qCO2 in forest was 3.6 mg C-CO2 mg-1 Cmic day-1.
  J. Goma-Tchimbakala , J.M. Moutsambote and S. Makosso
  A comparative study was carried out in Mayombe, between the soil of the natural forest and the soil under four Terminalia superba plantations of 7, 12, 32 and 48 years old. Ten composite soil samples were collected from ten systematically located squares (1 m2, four cores from each square) in each plantation. The goal was to evaluate the impact of reforestation on soil pH, exchangeable cations, base saturation, CEC and phosphorus in the 0-10 cm layer. The results showed that soil pH was 4.63 in natural forest and between 4.97 and 5.84 in plantations. Ca content was higher in the 7 year old plantation (7.83 cmol kg-1) than in natural forest (3.14 cmol kg-1). Mg was 3.27 cmol kg-1 in the young plantation and 1.41 cmol kg-1 in forest. K exhibited a low content in the plantations and high content in natural forest. Base saturation varied between 48.6 and 100%. The CEC was almost a steady state. All soil properties showed an initial increase in the seven years after reforestation. The increase was followed by a general decrease with aging of plantations. Despite this decline, the positive Deterioration Index (DI) recorded suggested that reforestation with T. superba slightly improved the soil attributes, except in the case of K and CEC in which a negative DI was obtained.
 
 
 
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