Limitations to net photosynthesis as affected by nitrogen status in jack pine (Pinus banksiana Lamb.) seedlings

arbre forestier azote carbon dioxide carboxylation carence en substance nutritive chemical composition chemical reactions composition chimique deficiencias nutritivas dioxyde de carbone efficiency eficacia electron transfer estoma feuille foliage forest trees gas exchange hojas intercambio de gases leaf conductance leaves nitrogen nutrient deficiencies nutrition des plantes oxidoreductions photosynthese photosynthesis pinus banksiana plant nutrition plantule seedlings stomata stomate transpiration