Lichen fields-blooms of orange and gray over red sand and crusts of blackish gypsum-keep the soil stable and are a critical source of food for invertebrates.
The major soil species suited for vegetable were gray salt paddy soil, gray mud paddy soil and black salt paddy soil, which occupied 92. 42% of total fields suited for vegetable in Licheng.
全区宜菜地土壤类型主要为灰埭田、灰泥田和乌埭田，占全区宜菜地总面积的92.42％。
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After median filtering, image mode transforming, and "bad area" filtrating to images of soil layer, the authors extract the characteristic parameter of a image, that is gray-value, and c.