陕北的榆林地区是全国著名的画像石产区之一。
Yulin of northern Shaanxi is the important production areas of stone reliefs in the whole country.
通过对陕北榆林风沙区防风固沙林体系的配置结构、树种组成、防风固沙效益、改良土壤的作用以及对天然植被的影响等的调查、观测和分析，结果表明：其配置结构较为合理，生态效益较为显著。
The effects of the sandbreak forest system in Yulin sandy area on the sandbreak, soil improvement and natural vegetation recovery were studied by investigating their configuring structure and species.
陕北榆林市既是我国重要的能源重化工基地，又是生态环境极端脆弱的危急区。
Yulin city is an important national base of heavy-chemical engineering, and an extremely vulnerable area as well.
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