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近几十年,北京城市每年都有很大变化,市区面积加大了,绿地也增多了。绿地中不但有树、有花,而且增加了草坪,北京已变成了一个美丽的花园城市。城市绿地中草的变化也是很大的,古老的北京城中过去是很少种草的,草一般都是自然生长的天然草地。上个世纪50年代,北京引进了美洲原产的野牛草,它非常适应北京的干旱气候,生长也快,不需要精细管理,很快就在绿地中推广起来。但它的缺点是绿色期短,枯黄的时间较长,冬
In recent decades, great changes have taken place in Beijing’s cities every year, the urban area has been enlarged and the green space has also increased. Not only in the green trees, flowers, but also increased the lawn, Beijing has become a beautiful garden city. The changes of Chinese grass in urban greenbelt are also very large. In the ancient city of Beijing, there were few grassy pastures. Grass was generally a natural grassland that grew naturally. In the 1950s, Beijing introduced the native American buffalo grass. It is very adapted to the arid climate in Beijing and grows fast. It does not need elaborate management and is quickly popularized in green space. But its shortcoming is that the green period is short, the yellowish period is longer, the winter