Abstract
Soil biological activity is partly determined by human activity. Areas with Pinus halepensis , have the highest microbial carbon contents (1.200 μg C g -1 ), while soils situated between tussocks of Stipa tenacissima and the abandoned fields have values of 300 μg C g -1 . Alivays, cultivated soils have a very low or negligible microbial activity (< 150 μg C g -1 ). In every case, except in the ploughed field, an increase in microbial carbon biomass occurs between June and February. The aggregate stability shows a similar spatial distribution as the microbial biomass. Pinus halepensis has soils with more stable aggregates than elsewhere. The soil in the area between tussocks of Stipa tenacissima is slightly more stable than the cultivated soil. Abandoned areas show intermediate behaviour, although this varies from season to season. The soil aggregate stability shows a clear spatial correspondence with microbial carbon biomass. This occurs at different season, although there is a period of delay that maybe different for each soil type.
Highlights
La estabilidad de los agregados del suelo muestra una clara relación espacial con la biomasa de carbono microbiano
Abandoned areas show intermediate behaviour, this varies from season to season
The soil aggregate stability shows a clear spatial correspondence with microbial carbon biomass. This occurs at different season, there is a period of delay that maybe different for each soil type
Summary
En un trabajo anterior tratamos sobre la variabilidad espacial de la agregación del suelo, recogiendo un mosaico de situaciones que representan distintos grados de intervención humana en el paisaje (Cerda et al, 1 994). Entre los objetivos perseguidos con nuestro trabajo, figura también el de estudiar los factores que intervienen en la agregación del suelo, los cuales -por su naturaleza- están sometidos a una dinámica espacial y temporal abordable desde distintas escalas de observación. La aproximación jerárquica ya ha sido utilizada en los estudios sobre agregación (Dexter, 1 988; Oades y Waters, 1 991 ) y permite establecer de forma recurrente la relación entre distintos niveles dentro de un sistema complejo que, como el suelo, está jerárquicamente estructurado y opera en una gama amplia de escalas espacio-temporales. El estudio de la biomasa microbiana (que incluye los grandes grupos sistemáticos de la microflora edáfica: Bacterias, Actinomicetos, Hongos y Algas), simultáneo al de la evolución de los agregados, supone una aproximación integradora en la que el soporte abiótico y los procesos biológicos en el medio edáfico, se organizan en un nivel superior de la jerarquía estructu ral.
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