Abstract
In an effort to elucidate the factors affecting soil N dynamics in the Dry Chaco ecosystem, soil respiration and microbial biomass N were measured for one year underneath 5 vegetation types: a leguminous tree (Prosopis flexuosa DC), a non-leguminous tree (Aspidosperma quebracho-blanco Schlecht.), a non leguminous shrub (Larrea spp.), the open interspaces, and a pure grassland. Ammonifier and nitrifier densities and N content in litter were also measured in some cases. Results were compared with previously reported N mineralization rates and soil fertility.
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