-30- 



N-fixation 38 



Nitrate 13,16,22,42,43,56,62,65 



Nitrification 67,70 



Nitrogen (N) 1,3,5,7,9,12,14-17,19,22-23, 



29-3 0,33,35,38-41,4 4,4 5,47, 

 49,50,55,56,61,67,71,73,75 



Oak 6,42,47 



Organic matter (o.m.) . . . 1,5,7,9,11,12,16,19,20,23,30, 



37,39-40,42,45,49-55, 

 58,63,64,70,73,76 



Percolation 68 



pH 1,5,7,8,12,19,23,28,29,33-36, 



45,47,56,61,67,70,73 



Phosphate 1,42,43 



Phosphorus (P) 1,3,5-7,9,12,13,15,19,23,24, 



28,29,33,35,44-45,49,56,61, 



64,67,70,71,73,75 

 Physical properties .... 8,9,11,49,52,60,63,68,69,74 

 Pine 4,5,10,14,15,22,27,35,39,40, 



43,45,63,64,66,69,72,75,76,78 

 Plants 1,3,9,19,33,35,40,44,47,59, 



71,72 



Populations 2,4 



Porosity 9,68 



Potassium (K) 1,3,5-7,12,13,17,19,23,24, 



28-30,3 5,42,44,45,49,56,61, 



64,67,70,73,75 



Rain 1,4,6,17,22,28,43,52,65,76 



Runoff 10,19,21,27,43,51,53 



Sand 6,12,20,27,52,57-59,61,68 



Seedlings 67 



Silt 42 



Slash 7,13,18,23,26,28, 



35,39,67,68,76,77 



Slope 10,24,51,66 



Smoke 17,22 



Sodium (Na) 17,19,23-24,28,35,61,64 



Species 4,36-37,52 



Spruce 15,18,29,70 



Structure of soil 26,28 



Temperature 1,3,9,19,20,34,41,52,54,55, 



61-65,70,75-77 



Texture of soil 20,67 



Time of effects, (and recovery) 



Months 12,13,36,40,64 



Season 1,4,16,33,44,76 



Years 1,7,10,13,18,23,27,29,31,35 



37,4 5-4 7,51,62,63,67,71,73 



