red birch

The results showed that red birch biomass was stimulated by CO2 enrichment, while the root to shoot ratio was not affected.

m-2两个密度水平。结果表明，升高CO2浓度可促进红桦幼苗生物量的增加，但对根冠比没有显著影响。

The response of wood/ bark properties of red birch seedlings to elevated CO2 ( EC) under low ( LD) and high density ( HD) were investigated in closed top fumigation chambers ( CTC).

研究了高（HD）、低（LD）两个种植密度下红桦幼苗的树皮和去皮树干特征对CO2升高的响应。

Response of dry matter allocation and nutrition of red birch ( Betula albosinensis) seedlings to elevated CO_2

红桦幼苗干物质分配与营养对CO2升高的响应

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。

I grew 80 replicates of three species: paper birch, Douglas fir, and western red cedar.

那时我种了三种树，一共80棵：有纸皮桦、花旗松和西部红杉。