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    STUDIA GEOLOGIA - Issue no. 1 / 2007  
         
  Article:   EFFECTS OF DIFFERENT SOIL PREPARATIONS METHODS ON THE FOLIAGE N DYNAMICS IN FINNISH BOREAL FORESTS: 15N NATURAL ABUNDANCE ISOTOPIC METHOD APPROACH.

Authors:  S.P. SAH, H. ILVESNIEMI.
 
       
         
  Abstract:  In this paper, we report on the impacts of clear cutting and soil preparations on the foliage N dynamics. We used natural 15N abundance to study this. The clear cutting is a common silvicultural practice in Finland and half of forest cuttings are regenerated from seeds. In order to provide better seed bed conditions and to improve environmental conditions for seedling growth, site preparation methods such as ploughing, burning, fertilization etc. are commonly used, but the effects of the rapid increase in slash and the removal of trees and the site preparation methods on the 15N fractionation, especially on long-term basis, have rarely been studied. This study concerns on the study about the impacts of the different site preparation methods on the foliage N concentrations and 15N. The different methods of site preparations studied were: i) Slash burning, ii) Ploughing, iii) Ploughing and fertilizer and, iv) Fertilizer alone and control (no treatment).  
         
     
         
         
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