国槐(学名：Sophora japonica Linn.)，别名：槐树、槐蕊、豆槐、白槐、细叶槐、金药材、护房树、家槐；拉丁文名：Sophora japonica Linn.，蝶形花科下一属落叶乔木，国槐是良好的绿化树种，常作庭荫树和行道树，且具有一定的经济价值和药用价值。国槐侧柏都已成为北京市市树，同时国槐也是河南省安阳市、陕西省西安市、辽宁省大连市、山东省泰安市的市树、山西省运城市的市树、河北石家庄的市树。
其中刺槐和国槐对高CO2浓度的响应最为显著。
Suggesting responses to the high CO2 concentration that Robinnia pseudoscacia and Sophorajaponica were the best apparent.
我们看见一颗国家级保护树木国槐，有五百多年历史了。
We saw a national protect trees scholar, has a history more than five hundred years.
前3种树种的日均蒸腾速率远高于刺槐和国槐，属于强蒸腾树种。
Suggesting that the first 3 tree species have relatively higher transpiration rate than others. They are high transpiration.
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