Soil biological activity under different land-uses in Leyte, Philippines
2006
Marohn, Carsten | Jahn, Reinhold | Sauerborn, Joachim
On seven sites in Western Leyte, Philippines, different land-uses, namely reforestation with indigenous tree species ('rainforestation'), reforestation with exotic tree specie Gmelina arborea, and traditional fallow / grassland use were compared with respect to soil biological activity. Analysed parameters were Basal Respiration (BR), microbial carbon (Substrate-Induced Respiration method, Cmjc SIR) and leaf litter decomposition. Correlations between BR, SIR, metabolic quotient (qCO2), soil organic carbon (Cor), soil N (NT) and pH were assessed. BR and Cmjc SIR as well as the metabolic quotient qCO2 (BR/SIR) proved to be sensitive parameters and the methods gave reproducible values to distinguish sites and land-uses in most cases. However, due to differences among fallow / grassland treatments, a uniform tendency between these and rainforestation was not observed. On the other hand, BR and C mic SIR were significantly higher under Gmelina than under either of the other land-uses. Correlations between parameters were strongest for BR vs. Corg and BR vs. pH as well as for Cmic SIR vs. Corrg and qC02vs.Corg.
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