Leaf Area Index and Specific Leaf Area of Natural Poplars in Ergis Basin

Leaf area indice and specific leaf areas of four species poplar species in Ergis basin were measured,namely Populus nigra,P.laurifolia,P.× jrtyschensis and P.alba.Relationship between specific leaf area and the leaf biomass of different diameters as well as the relationship between leaf area index and leaf biomass were examined.The results showed:(1) the variation range of leaf area index was 0.243~4.463 in this area,(2) Linear positive correlationship existed between the individual tree leaf area index and the leaf biomass with an analogue equation y=ax-b,and exhibited a linear increasing pattern(r2=0.917 8~0.972 5);(3) differences in average specific leaf area and leaf biomass of all diameter classes were significant among all kinds of poplars,specific leaf area and leaf biomass of all kinds of poplars assumed the remarkable inverse relation(p0.01).