Abstract
The numbers, weights, and ages of root nodules were determined in a homogeneous 6- to 7-year-old stand ofHippophae rhamnoides in a coastal sand-dune area. Large variations in the number of nodules, which ranges from 30 to 281 per m2 were found. Most of the nodules occurred between 10 and 60 cm below the soil surface. In the surface layer and lower than 60 cm only small numbers of nodules were present. It is concluded that relatively large samples have to be investigated to obtain an impression of the nodulation of a given stand and to permit a comparison of the contribution of dinitrogen fixation in different stands.
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