在塞外草原腹地锡林浩特南郊,方圆几里只生长着一棵郁郁葱葱、枝叶繁茂的老榆树,素称一棵树.一棵树是人为有意播种,还是野风吹来的种子在这里安家落户?它经历了多少个风雨春秋?它的树龄有多大?一连串的问号使人疑惑,因为它身处荒郊野外平淡无奇,似乎不值得人们去深究,更谈不到去考察它的渊源.这里气候变化无常,温差大,干旱年份降雨量只有100多毫米,在生长季节,干旱有时持续20～30天.在这寒冷、干旱、多风的 In the southern outskirts of Xilinhot, in the hinterland of the Great Plains, only a lush, lush old elm grows in a radius of a few miles and is called a tree. Is a tree planted by people, or is the seed of a wild wind settled here? How old is it and how old is it? A series of question marks is puzzling because it is in the middle of the wilderness and does not seem to be worth exploring, let alone examining its origins. Here climate change Impermanence, a large temperature difference, arid year rainfall of only 100 mm, in the growing season, drought sometimes lasted 20 to 30 days in this cold, drought, windy