GB/T 32740-2016 in English

Background and significance of the standard

This standard was jointly drafted by seven institutions including the Nanjing Institute of Soil Science, Chinese Academy of Sciences, and for the first time established a soil monitoring technology system covering the four major natural ecosystems. Its technological evolution has gone through three stages:

Core monitoring technology specifications

1. Sampling site setting

Use a GPS locator to enclose the sampling site, and the closure error must be ≤1% of the circumference. Setting requirements for different types of ecosystems:

• Forest system: 1hm² projection area, avoid ridges and valleys
• Desert system: Need to be more than 100m away from wind erosion areas

2. Layered monitoring indicators

Quality control system

Adopt a three-level quality control mechanism:

1. Sampling stage: 10% parallel sample control
2. Laboratory: XS control chart (GB/T 4091)
3. Data review: Dickson test method (GB 17378.2)

Critical control point: Trace element analysis requires the use of agate mortar to avoid metal contamination

Implementation suggestions

1. Technical configuration

• Basic configuration: ring knife (bulk density determination), Tullgren funnel (soil animal separation)
• Advanced configuration: ICP-AES (full element analysis)

2. Data management

Establish a five-category document system. The metadata must comply with the requirements of GB/T 20533. It is recommended to adopt a three-media backup strategy (paper + CD + hard disk)