山西省吕梁地区地处黄河中游 ,全区有 2 5°以上的陡坡地 14 8万ｈｍ2 ,宜林荒地近 40万ｈｍ2 ,退耕还林还草任务艰巨。今年 ,全区有 5个县被纳入全国西部开发退耕还林还草试点示范区 ,其中中阳县被国家林业局、中国林科院选定为黄河中游地区惟一的退耕还林 (草 )科技支撑试点 The Luliang region of Shanxi Province is located in the middle reaches of the Yellow River. There are 148,000 hm2 steep slopes of more than 25 degrees in the region, and nearly 400,000 hm2 of suitable fallow land. The task of returning farmland to forests and grasslands is arduous. This year, five counties in the region were included in pilot demonstration areas for returning farmland to forest and grassland in the western part of China. Zhongyang County was selected by the State Forestry Administration and the Chinese Academy of Forestry as the only technology for returning farmland to forestry (grass) in the middle reaches of the Yellow River Support pilot