GB/T 1927.1-2021Test methods for physical and mechanical properties of small clear wood specimens - Part 1: Collection of sample tree (English PDF)

1 Scope

This document describes the test method for the physical and mechanical properties of wood with small samples without defects:

material interception and recording, as well as test material numbering and transportation:

This document is applicable to the collection of test materials for the study of wood physical and mechanical properties of standing trees of the same type:

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document:

GB/T 1927:2 Test methods for physical and mechanical properties of wood with small unblemished samples - Part 2: Sampling methods and general requirements (GB/T 1927:2-2021, ISO 3129:2019, MOD)

GB/T 1927:4 Test methods for physical and mechanical properties of wood with small flawless specimens - Part 4: Determination of moisture content (GB/T 1927:4-

2021, ISO 13061-1:2014, MOD)

GB/T 26423-2010 Forest Resource Terminology

LY/T 1788 Terms for wood properties

3 Terms and Definitions

The terms and definitions defined in GB/T 26423-2010 and LY/T 1788 and the following terms and definitions apply to this document:

3:1 homogeneousstand

A forest area that has the same internal forestry characteristics and is significantly different from the surrounding areas:

3:2 canopy density crowndensity; shadedensity

The ratio of the vertical projected area of the canopy to the woodland area:

Note: expressed in tenths:

[Source: GB/T 26423-2010, 6:42, with modifications]

3:3 root neck rootcolar

The part of a standing tree that is transformed from a root to a stem:

3:4 diameter at breast height; DBH The diameter of the trunk above the ground surface at breast height:

Note: Generally, the height of the chest is set as the height of 1:3m above the root neck:

GB/T 18107 | LY/T 2407 | LY/T 1184 | GB/T 1927.4 | GB/T 1927.3 | GB/T 1927.2 | […]