The effects of elevated CO2 concentration on dry matter allocation and nutrient contents of red birch seedlings were studied under two planting densities in controlled environment Chambers.
采用控制环境生长室研究了2个密度水平下CO2浓度升高对红桦幼苗干物质分配与营养的影响，并分析了红桦干物质分配与养分浓度的关系。
Exhibit: American hardwood lumber and floorings. species include red oak white oak ash hard maple soft maple hickory cherry basswood beech birch curly soft maple butternut white pine etc.
展品：北美硬木板材，地板等。品种包括红橡，白橡，水曲柳，硬枫，软枫，山核桃木，樱桃木，椴木，山毛榉，桦木，波纹软枫，白胡桃，白松木等。
Species include Red Oak, White Oak, Ash, Hard Maple, Soft Maple, Hickory, Cherry, Basswood, Beech, Birch, Curly Soft Maple, Butternut , White Pine, etc.
品种包括红橡，白橡，水曲柳，硬枫，软枫，山核桃木，樱桃木，椴木，山毛榉，桦木，波纹软枫，白胡桃，白松木等。
In a promotion for the Red Bull X-Fighters World Tour, British motocross rider Chris Birch soars through the air as actors take afternoon tea in front of the Stowe House in North Buckinghamshire.
为促进红牛极限摩托车赛，英国摩托车手克里斯•伯奇在英国白金汉郡北部斯托花园，驾车从正在花园喝午茶的几名演员头顶飞过。
In a promotion for the Red Bull X-Fighters World Tour, British motocross rider Chris Birch soars through the air as actors take afternoon tea in front of the Stowe House in North Buckinghamshire.
为促进红牛极限摩托车赛，英国摩托车手克里斯•伯奇在英国白金汉郡北部斯托花园，驾车从正在花园喝午茶的几名演员头顶飞过。
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