地衣区是指红色沙石和黑色石膏地表之上的橙色及灰色植被区，它能稳固土壤，是无脊椎动物最关键的食物来源。

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.

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蚯蚓作为土壤环境中最常见的无脊椎动物在生活过程中的摄食、做穴、移动、排便等行为都会对土壤重金属产生影响。

Earthworm as one of universal invertebrates in soil, its ACTS including food - intake, burrow and excretion can influence the activity of heavy metals.

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