According to the investigation and research of the Lithocarpus henryi forest in Nanyue,Hunan Province,this community is a new type that it hasn t been reported,it can be called Association of Lithocarpus henryi+Cyclobalanopsis multinervis-Camellia caudata-Oplismenus undulatifolius and it is belonged to the evergreen and deciduous broad-leaved mixed forest.

the comparative experiment between the rectangular pyrophyllite and the cubic one used in synthesis was discussed in this paper, the result showed that the anvil consumption was effectively reduced and the output and the quality were increased by using the reasonably designed rectangular pyrophyllit

The leaf area estimations were found to be significantly correlated to the parameters (leaf length, leaf width, leaf fresh weight and leaf dry weight) measured, and be applicable in nondestructive experiment by using leaf length or width.

And then,based on observations on leaf length and leaf width of different leaf positions(LP) on main stems under different nitrogen rates and densities with four cultivars(LY108,86Y8,NJ43,YD 6),the change patterns of specific leaf weight(SLW) with leaf position and the relationship between leaf length and width of rice on main stem were analyzed.

629 2x4,for calculating the leaf area and relative indexes of Trifolium repens was established by using its leaf length and leaf width as measuring indexes.