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Spatial analysis of water characteristic functions in a sandy podzol under pine forest
Author(s) -
Deurer M.,
Duijnisveld W. H. M.,
Böttcher J.
Publication year - 2000
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2000wr900186
Subject(s) - scaling , similarity (geometry) , mathematics , podzol , soil science , scale (ratio) , nonlinear system , spatial ecology , soil horizon , spatial dependence , soil water , environmental science , statistics , geometry , physics , ecology , quantum mechanics , artificial intelligence , biology , computer science , image (mathematics)
Water characteristic functions of 351 undisturbed soil cores taken at three profiles on a two‐dimensional regular grid with a spacing of 0.15 m are shown to vary linearly and nonlinearly in space. To describe their heterogeneity, linear and nonlinear scaling factors are independently derived with soil horizons as separate similarity classes. Their estimated empirical distributions are different, and the spatial statistics show a comparable integral scale only in the horizontal direction (∼0.15 m). In the vertical direction, nonlinear scaling factors exhibit an integral scale of ∼0.2 m, and linear scaling factors exhibit a pure nugget effect. On a small sample subset, other soil material properties (e.g., texture) were also analyzed. In a multiple linear regression between those material properties and scaling factors the organic carbon content is a significant deterministic factor at the site.