Relating Corner Rule With Community Structure And Species Compostion In An Evergreen Broad-leaved Forest In Tiantong Region, Zhejiang Province

The correlation between twig size and leaf size is an important life form for biomas distribute strategy. But recent studies for Corner's rule mainly concentrated in the effect of environment, lacking of provement in a local community level. In this paper,3056 plants in lha plot in Tiantong evergreen broad-leaved forest were studied. This research involves three aspects:leaf size-twig size, leaf size-number and twig size-number for Corners rules in community flora component. community quantity character and community structure. The results were as follow:1) In the family level, the significant positive correlation was found between leaf-size and twig-size (p<0.01). For genus level, nearly most of the SMA slopes between annual twig sectional-area and total annual-leaf area were significant larger than 1(p<0.01), plant lean to the investment for total annual-leaf area. But biomas were invested more to twig while comparing twig sectional-area and annual-leaf area, annual twig mass and total annual mass, annual twig mass and annual mass. In the species level, most of plants invest more to total annual-leaf area while comparing twig sectional-area and total annual-leaf area, only few of them showed isometric scaling relationship. Most species showed allometry scaling relationship between annual twig mass and total annual mass, annual twig mass and annual mass, and few showed isometric scaling relationship. The scaling relationship between twig size-number, leaf size-number indicated that most of species in this region were inclined to a great deal of small twigs and leaves.2) For different individual community densities. SMA slopes for annual twig sectional-area and total annual-leaf area were significant larger than 1(p<0.01) but for twig sectional-area and annual-leaf area, annual twig mass and total annual mass, annual twig mass and annual mass were smaller than 1(p<0.01). For the smaller community density, total annual-leaf mass were larger for the given twig mass.For common and rare species, biomas were also invested to twig, twig number and leaf number. The common species brace more leaf mass for a given twig mass, but rare species brace more leaf area for a given twig sectional-area.3) For species below 8m. allometry scaling relationship were found between twig-size and leaf-size, but above 20m, isometric scaling relationship were found. Species lie in the middle level have smaller annual leaf area for a given twig sectional-area, but species total annual leaf mass and annual twig mass were equal for a given twig mass. Species at the bottom level, were inclined to larger number of small leaves and small twigs, but at the top level, species inclined to medium leaf size and twig size.4) In the vally and neutral habitat, the SMA slopes for annual twig sectional-area and total annual-leaf area were larger than 1(p<0.01). others were smaller than 1(p<0.01).Species in vally habitat generally had larger leaf area than species in neutral habitat. Plant inclined to larger number of small leaves and small twigs in neutral habitat.5) Evergreen shrub and deciduous shrub invest more to leaf area, but evergreen tree and deciduous tree showed isometric scaling relationship. Leafing intensity and leaf size, twigging intensity and twig size were negative correlated, plant were inclined to larger number of small leaves and small twigs. For a given leafing intensity, deciduous species had larger leaf area than evergreen species, and evergreen species had larger leaf mass than deciduous species.