Soils are important compartments of ecosystems which are characterized by s
elf-regulation within specific limits and different spatial and temporal he
terogeneities. Soil sampling has to take into account the sampling strategy
, pre-analytical sample processing, extraction and analysis and the interpr
etation of data as well as quality controls. Some examples from different i
nvestigations illustrate special sampling problems under different circumst
ances. (C) 2001 Elsevier Science B.V. All rights reserved.