Studies On The Characteristic And Management Of The Mountain Forest In The Steppe Region Of Baiyin' Aobao Forest Farm, Inner Mongolia

Based on the community structure analysis of the Larix principis-rupprechtii artificial forest and the Betula platyphylla secondary forest, this thesis evaluated the underway tending felling and improvement of second-growth-stand, then compared their productivity in mountain region and steppe region.In Baiyin'aobao area, breast-height-diameter and height annual increment had notable relation with annual mean temperature and frost-free season.Animal could promote Larix principis-rupprechtii artificial forest natural regeneration through destroying layer Ao of soil, so as to the seedling's roots could grow on the soil.In this area, the first thinning should be carried out during the age of 12a to 14a, and the thinning interval is 5 a to 10a.In the artificial forest, weak thinning should better be applied to the young-age forest, however, in the standard-age forest which was never tending, a strong thinning must carry through in time.The Form. Betula Platyphylla could be classified to Ass. Shrub-Betula Platyphylla, Ass. grass-herb- Betula Platyphylla and Ass. Picea mongolica along streamlet. Full-scale tending improvement could observably avoid recessive succession which was frequently occurred in the frail area.The productivity of Larix principis-rupprechtii artificial forest and Betula platyphylla secondary forest in the mountain region were apparently more higher than that in the steppe region.