QX/T 301-2015 in English

Interpretation of the core content of the standard

This specification stipulates the electronic balance weighing method for the moisture content of forest floor combustibles. Samples are obtained through stratified sampling (ground cover layer and humus layer), and the mass loss rate is calculated after constant temperature drying at 105℃. Technical points include:

Key technical implementation points

1. Layered sampling specifications

Use a 30cm×30cm standard sampling frame to collect samples in the order of ground cover layer (surface weeds, dead branches) → humus layer (0-20cm). Note:

• During the snow accumulation period, the snow layer needs to be removed for sampling
• The aboveground part of the weeds should be retained
• After mixing, each layer of samples should be immediately packed in aluminum boxes

2. Moisture content determination process

Background of Standard Evolution

Based on 30 forest fuel studies from 2006 to 2015 (references 1-6), this standard unified for the first time:

1. Sampling depth (humus layer ≤ 20cm)
2. Drying judgment threshold (0.2g)
3. Layer calculation method

Implementation recommendations

Quality control measures

• It is recommended to use electronic balance with windshield to avoid airflow interference
• A traceability relationship is established between the aluminum box number and the sampling point
• Re-testing after precipitation must be completed within 3 days

Data application direction

Moisture content data can be used for:

• Forest fire risk level forecast model
• Combustibility evaluation of combustibles
• Study on the impact of climate change on forest ecosystems