The results show that the radial variation patterns are “increasing first, then levelling off” for fiber length and “decreasing first, then levelling off” for microbr.

In this paper, Mytilaria laosensis plantation were systematic studied on the wood anatomical structure, chemical properties, physicao—mechanical properties and their variation pattern.

The tracheid length and width,ratio of length to width,ratio of the cell wall to lumen and mircrofibrillar angle were measured,and their variation patterns were analyzed.

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.

Research on micro seismic monitoring and measurement of overburden strata movement variation law in outcrop seam mining;

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.

The rule of diurnal variation of net photosynthetic rate of the fine half-sib families of slash pine were studied by Licor-6400 portable photosynthesis system in order to adjust planting measurement.