• Bodembiologische Indicator 1999. Ecologische kwaliteit van graslanden op zandgrond bij drie categorieen melkveehouderijbedrijven

      Schouten AJ; Bloem J; Didden W; Jagers op Akkerhuis GAJM; Keidel H; Rutgers M; LER (Rijksinstituut voor Volksgezondheid en Milieu RIVMAlterraWURBlgg, 2003-04-10)
      The project Biological Indicator for Soil Quality (BISQ) has its roots in the Convention on Biological Diversity (Rio de Janeiro, 1992) and in the additional research programme of the Dutch government. The main object of the project is to develop quality standards for functional diversity of soil organisms outside protected area's, to fill the gaps in knowledge in the functional aspects of biodiversity. This report describes the measurements that were made in the first year (1999) of the biological monitoring programme. The investigated categories are pastures of (19) extensive and (20) intensive cattle farms on sandy soils. Ten organic cattle farms were used as a reference. The following groups of biota and indicators were assessed: 1) micro-organisms; 2) nematodes; 3) enchytraeids; 4) earth worms; 5) micro-arthropods; 6) potential carbon and nitrogen mineralisation. Results of ecological measurements are integrated in a so-called Amoeba-diagram. It shows the deviance of the individual indicator from the reference value. In the extensive farms 13 of the 63 indicators were significantly different from the reference. In the category intensive 17 out of 63. Of the specific diversity indicators 59% had lower values in extensive farms and 71% in intensive farms. The mean deviation of all the indicators was expressed as a Soil Quality Index (SQI). The SQI of extensive and intensive farms was 73% respectively 67% of the reference.<br>