桦树在我区分布广泛,每年种子产量很大,可惜过去未加以充分利用。为了充分利用森林资源,发展我区有价值的乡土树种,挖掘种苗潜力,解决目前种苗不足的困难,以适应大地园林化的需要,我所试验场,继1954年对白桦采种、贮藏、育苗试验之后,于今年夏季,又进行了白桦、黑桦的播种育苗方法研究,并取得初步成果,现介绍如下: 一、种子来源与贮藏。我们今年试验的白桦、黑桦种子,系1958年9月采集于大兴安岭绰尔林区,经同年11月上旬贮藏前的温箱发芽检验(21℃恒温),白桦的种子发芽率为20%,黑桦的种子发芽率为22.7%, Birch in my area is widely distributed, a large annual seed yield, but in the past did not take full advantage of. In order to make full use of forest resources, develop valuable native tree species in our region, excavate the potential of seedlings and solve the current shortage of seedlings to meet the needs of the large-scale gardenification. In my test field, following the birch planting, storage, After the nursery test, this summer, another white birch, black birch sowing seedling research methods, and achieved initial results are as follows: First, the source and storage of seeds. The white birch and black birch seeds we tested this year were collected in September 1958 in the Zhuorulin district of Daxinganling. After the sprouting test (temperature 21 ℃) before storage in early November of the same year in the same year, the germination rate of white birch seeds was 20% Black Birch seed germination rate was 22.7%