农业科学

• 白桦

  4 mRNA differential display system of Birch was established.

  4、建立了适应白桦的mRNA差异显示分析体系，优化了反应条件和反应程序。

• 桦木

  Bonding properties of Larch , Birch and Oak with aqueous polymer isocyanate adhesives were studied in this paper.

  本文采用水性高分子异氰酸酯胶（API胶粘剂）对东北主要树种落叶松、桦木和柞木的胶接性能进行了研究。

• 桦树

  The largest total P content in the different layers is larix principis-rupprechtii community,the smallest is broadleaved mixed forest of poplar-birch-oak. The average content of soil available phosphorus is 19.8mg/kg, for most species it can satisfy the need.

  土壤碱解N含量最大的为华北落叶松群落；华北落叶松群落全P含量在不同的土层中均表现为最大,全P含量最小的均为杨树、桦树、栎树阔叶混交林,研究地土壤速效磷平均含量为19.8mg/kg,对于大多数树种来说已能满足需要；研究地土壤全K平均含量为2.83%,属于含K量较丰富的地区。

生物学

• 桦树

  In total 125 nests were found in the field,nesting on willow, poplar, birch and other hardwood trees near lakes and rivers.

  研究结果共发现巢125个,营巢位于于临近湖泊、河流等水域附近的柳树、杨树、桦树等阔叶树上。

• 桦属