Fig. 5. Coefficient of leaf N allocation (Ka and Kb) for main stem leaves in relation to Ka and Kb of whole shoots (mean ± s.e.). Open symbols with Ka (NLA = a (I/I0)Ka) and closed symbols with Kb (NLA = b (I/I0)Kb + nb). I+N+ (circles), I+N– (upright triangles), I–N+ (inverted triangles), I–N– (diamonds), and cI–N– (squares).