油松（PinustabulaeformisCarr.）为本区乡上树种，集中分布在桥山及黄龙山南端海拔1000～1700m间，北部可延伸到神木、府谷一带。1980年我所在米脂县东沟流域的高家沟村筹建一处树木引种观察园，其地形地貌典型地代表了榆林南部梁明丘陵沟壑区的特点。从1983年开始，针对油松 Pine (PinustabulaeformisCarr.) Is a native species in the area, concentrated in the Qiaoshan and Huanglongshan southern elevation 1000 ~ 1700m, the northern extension to Shenmu, Fugu area. In 1980, I was located in Gaogou Village, Donggou Valley, Mizhi County, where a tree introduction observation garden was established. The topography of the valley typically represented the characteristics of the Liangming hills and gully areas in southern Yulin. Since 1983, for pine