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Representative Sampling for Bulk Density in a Vertisol
Author(s) -
Chan K. Y.
Publication year - 1981
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1981.03615995004500030049x
Subject(s) - vertisol , bulk density , sampling (signal processing) , soil science , shrinkage , geology , mineralogy , environmental science , mathematics , soil water , statistics , physics , optics , detector
Undisturbed bulk density samples (7.5 cm internal diam and 7.5 cm long) were collected using a Tanner Sampler at different depths down to 50 cm from a Vertisol in Australia. Representative samples were obtained only for the top 20 cm layer. For the deeper layers, the bulk density results followed the one‐dimensional shrinkage relationship, instead of the three‐dimensional one, and therefore suggested nonrepresentative sampling. This was explained in terms of the increasing size of the soil structural units with depth, and hence the core samples from below 20 cm were too small to represent the field soil structures.