Erosion and deposition variation features of littoral coast are analysed,and regional differentiation and genetic regular of erosion and deposition variation of littoral coast are also studied in this thesis.

On the basis of diplog tadpole plot,the Donghe sandstone of coast deposit is classified into four kinds of 4th-order reservoir architectures,and twelve kinds of 3rd-order reservoir architectures,and twenty-four kinds of lithofacies units.

laosensis plantation wood was systematically studied on the anatomical properties and their radial variation patterns by using electronic microscope and micrograph analysis system of computer,and approaches of quantitative anatomy were us.

Studies on Wood Properties and Variation of Plantation Poplar;

<Abstrcat>This study was conducted for fully understanding of variations of gutta-percha content characters in leaves from different variance-types, which aims to provide theoretical guidance for selections of valuable resources and effective utilization of Eucommia ulmoides Oliv.

Typical tree slelction and random sampling were applied for systematic studies on individual variation of gutta-percha content in samaras of Eucommia ulmoides and the correlations between the characters of samara containing gutta-percha and several macroscopic properties.