Figure 3 Sampling scheme: (a) diagram of 1.0×1.0 m frame, divided into 0.2×0.2 m quadrates. Grey background represent a trampling route, whereas the white background represents the inter-route spaces. Red stars mark quadrates used for visual observations. Purple triangles mark quadrates used for crust and soil sampling; (b) characteristic dark (top) and light (bottom) crusts; (c) crust sampling.
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