张家口坝上地区,是个干旱寒冷的地方,原来的乡土树种只有少数的榆树,盐碱地有时能见到柽柳,其他都是建国后新引进的树种,主要是杨、柳。生长好的杨树品种有青杨、垂枝青杨、芋县白皮杨、丰宁密枝青杨等。落叶松在个别湿润肥沃处,生长的也不错。云杉只在坝头山地有较大的片林,其他各地都是零星栽植的风景树,生长较慢。樟子松虽要求一定的空气湿度,秋风一吹针叶变黄,但至翌春又 Zhangjiakou area dam, is a dry and cold place, the original native tree species only a few elm, salinity can sometimes see tamarisk, the other are the new species introduced after the founding of the PRC, mainly Yang, Liu. Growing poplar varieties are Poplar, weeping shrubs, taro white poplar, Fengning dense branches Poplar and so on. Larch in some wet fertile place, growth is not bad. Spruce only in the head of the mountain have a larger piece of forest, the rest are sparsely planted landscape trees, grow more slowly. Although Pinus sylvestris requires a certain degree of air humidity, autumn wind blowing yellow, but to the next spring and