Figure 1 An analysis of the variation in root channel area with
soil depth in different types of soil.
Note: H- high salinity; M- moderate salinity; L- low salinity;
UP- soil under the plants (a circular area with a radius of 13 cm
centered on the plant stem); IR- inter-row soil. The data are means
(n=5). (A) The variation trend of channel area in different soils with
increasing soil depth; (B) Different lower case letters denote
significant differences among different soil sample types at a given
soil depth (p ≤0.05). The ratios of the root channel area in the 0-200
mm soil layer and the 200-400 mm soil layer for seven different types of
soil were indicated above the lower case letters.