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Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level.
Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document
Collection and preservation of forest soil water and natural water samples
WITHDRAWN published on 1.1.1987
Selected format:Determination of forest soil water content
WITHDRAWN published on 1.1.1987
Selected format:Determination of forest soil water potential
WITHDRAWN published on 1.1.1987
Selected format:Determination of forest soil water-physical properties
WITHDRAWN published on 1.1.1987
Selected format:Determination of forest soil maximum hygroscopic water
WITHDRAWN published on 1.1.1987
Selected format:Determination of forest soil permanent wilting percentage (wilting coefficient)
WITHDRAWN published on 1.1.1987
Selected format:Determination of forest soil permeability
WITHDRAWN published on 1.1.1987
Selected format:Determination of forest soil temperature
WITHDRAWN published on 1.1.1987
Selected format:Determination of forest soil respiration
WITHDRAWN published on 1.1.1987
Selected format:Determination of carbon dioxide content of forest soil air
WITHDRAWN published on 1.1.1987
Selected format:Latest update: 2026-06-11 (Number of items: 2 281 927)
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