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Spatial and Temporal Variability of Extractable Lipids as Influenced by Cropping History

^a Eastern Cereals and Oilseeds Research Centre, Agriculture and Agri-Food Canada, Ottawa, ON, Canada K1A 0C6
^b Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada, Sainte-Foy, QC, Canada G1V 2J3

View larger version (40K): [in a new window]   Fig. 1 Soil map and sampling points of perennial and annual fields

View larger version (25K): [in a new window]   Fig. 2 Experimental and fitted variograms of selected soil properties: (a) silt content (perennials), (b) clay content (annuals), (c) sand content (annuals), (d) organic C (annuals), (e) DEE/CHCl3 (perennials, 1989), (f) CHCl3/TEL (perennials, 1989), (g)CHCl3/TEL (annuals, 1994), (h) DEE/CHCl3 (annuals, 1994). DEE, CHCl3, and TEL represent diethyl ether–, chloroform-, and total extractable lipids, respectively

View larger version (44K): [in a new window]   Fig. 3 Spatial distribution of sand, silt, clay, and total organic C contents in perennial and annual fields (1989)

View larger version (65K): [in a new window]   Fig. 4 Spatial and temporal distributions of CHCl3–extractable lipids in perennial and annual fields

View larger version (60K): [in a new window]   Fig. 5 Spatial and temporal distributions of DEE/CHCl3 gravimetric ratio in perennial and annual fields

View larger version (64K): [in a new window]   Fig. 6 Spatial and temporal distributions of CHCl3/total extractable lipids (TEL) gravimetric ratio in perennial and annual fields