Changling County is located at the west of Jilin Province, the hinterland of Songliao Plain.
长岭县位于吉林省西部，松辽平原腹地。
Taken Da 'an city in the west of Jilin Province as a case, this article studies the landscape pattern of a county in the edge of arg-herd in the past 20 years.
本文以吉林省西部大安市为例，研究近20年来我国北方农牧交错带县域农业景观格局的变化情况。
Grassland is the most important vegetation in the West of Jilin Province and is the concentrated reflection of regional comparative advantage of natural resources.
草原是吉林省西部最重要的植被类型，是区域自然资源比较优势的集中体现。
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