red birch

1. 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。
2. 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。
3. 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
4. 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。

noun

1. birch of swamps and river bottoms throughout the eastern United States having reddish-brown bark

   Synonym:    black birchriver birchBetula nigra