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翁达林业局从1978年开始培育容器苗,培育出的云杉,落叶松容器苗四万多株在不同海拔高度和不同迹地类型进行更新试验80多亩,效果较好。 翁达林业局属青藏高原边缘干旱性地带,气温低、冻土期长(当年10月至翌年4月)、春旱严重(1—5月降水量<100毫米)、霜期不断(全年无霜期<30天)、植物生长期短(全年<100天),更新十分困难。特别是沟尾和与草原相邻的迹地人工更新几乎没有成效。该局除了不断摸索裸根苗更新外,早在1977年采用带土植苗更新试验,当年成活率100％,第三年保存率87.8％。但是带土植苗费工,土团易松散,在交通不方便的高山林区难于推广使用,故进行容器苗更新试验。
Wengda Forestry Bureau began to cultivate container seedlings in 1978, cultivating more than 40,000 spruce and larch container seedlings in different altitude and different types of land to test 80 acres, the effect is better. Wengda Forestry Bureau belongs to the arid zone on the edge of the Qinghai-Tibet Plateau with low temperature, long period of permafrost (from October to April of the following year), severe spring drought (precipitation of <100 mm in January-May) and constant frost period <30 days), short plant growth period (<100 days a year), the update is very difficult. In particular, artificial tailings and trenches adjacent to grasslands have been almost ineffective. In addition to continually exploring the renewal of naked root seedlings, the Bureau used soil seedling renewal test as early as 1977 with a survival rate of 100% and a third-year preservation rate of 87.8%. However, with the soil seedling workers, soil easily loose, difficult to promote the use of high mountain forest is not convenient transportation, so the container seedling renewal test.