... biomassinvestment in branches in low light. However, in our study,there was an increase in the fractional investment in needleswith increasing Qint in the fertile site, and no effect of Qint in the ... Differences in branching angle,branch length, and frequency of branching modify the aggregation of the foliage on the branches [19, 20, 40, 78], and thereby change the degree of self-shading within the ... generallyincreases with increasing light availability in the canopy [74],possibly because of the positive scaling of Rb with irradiance. The dependence of Rb on Qint in P. sylvestris in the...