Fluctuation of the ARA under Elaeagnus Angustifolia Canopy

Abstract

The free fixing microorganisms acting as intermediaries between the atmospherical and edaphic nitrogen carry out regulating action on the total nitrogen available at soil level. On the other hand, plants can influence the physiological activity of these microorganisms through the formation of microclimates by canopy effect and by means of organic material input. Thus, in the rhizosphere there are from 5–10 times more microorganisms than in the soil because the organic compounds liberated by the roots are used directly by the microbial population as substratum for their growth. Dinitrogen fixation in the rhizosphere of some plants also increases because this area is a most favourable place for diazotrophic microflora development.