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渭北黄土高原包括渭南、铜川、延安、咸阳、宝鸡等5地市的北部和榆林地区的南部山区。这一地带,南部地形以土石山区为主,北部主要是以丘陵沟壑为主的黄土高原。年均气温5.9～13.3(℃。年降雨量南部600～700mm,北部350mm左右。 陕西黄土高原是黄河中游水土流失最严重的地区,也是飞播造林要啃的硬骨头。由于这一地带属于北温带和暖温带半湿润气候类型,土壤瘠薄,雨量分布不均,干旱指数高,加上北部白于山区植被稀少,飞播成苗风险大大高于全省其它地区。林业部门为了加快这一地段的绿化造林成果,提高飞播成林效果,在飞播造林中,重点推广了三项技术。一是在关中北部旱原区推广秋季播种技术,避
Weibei Loess Plateau Including Weinan, Tongchuan, Yan’an, Xianyang, Baoji and other five cities in northern Yulin and the southern mountainous areas. In this area, the southern terrain is dominated by mountainous areas and the northern part is mainly the loess plateau with mainly hilly gully areas. Average annual temperature of 5.9 ~ 13.3 (℃. Annual rainfall of 600 ~ 700mm in the south, 350mm in the north of Shaanxi Loess Plateau is the most serious areas of soil erosion in the middle reaches of the Yellow River, but also fly bosch afforestation to eat the hard bones .Because this area belongs to the north temperate zone and Warm temperate sub-humid climate types, soil infertility, uneven rainfall distribution, high drought index, coupled with scarce vegetation in the northern Baiyu Mountain, the risk of aerial seeding is much higher than the rest of the province.Forest department in order to speed up afforestation in this area Achievements, to improve the effectiveness of aerial seeding forestation, in aerial seeding afforestation, focusing on the promotion of the three technologies.First, in the northern part of the Guanzhong area to promote autumn seeding technology, avoid