Verification of the "regeneration sheltered by fallen trees" hypothesis in poorly recovering burned forests of northern Mongolia and development of methods for promoting natural regeneration.

近30年来，我国发生了许多森林火灾，这些森林的更新非常困难，所以我们研究了这些森林的更新机制和抑制更新的因素，我们有时会发现这些森林中树木呈线性排列。因此，我们提出了“倒地树木遮挡更新”的假说。为了验证我们的假说，我们对火烧区的更新抑制因素进行了实地实验。数据清楚地表明了三个制约因素：阳光直射、种子短缺和枯枝落叶。而我们的种子发芽率最高的试验点是翻耕播种区的北侧。除了这些结果外，我们还发现了其他许多自然生长到子树上的再生样本。从这两个额外的结果中，我们验证了我们的假设。根据我们的假设，我们制作了一本促进森林更新的手册。

Many forest fires have happened since about 30 years ago and regeneration of such burned forests go very badly.So we investigate the regeneration mechanism and the factors inhibiting regeneration of those forests.We sometimes found linear arrangements of trees in those forests. So we hit upon "Regeneration sheltered by fallen trees"hypothesis.We made field experiment on factors inhibiting regeneration in burned area to verify our hypothesis. The data indicates clearly three inhibiting factors, direct sunlight, shortage of seeds and litter. And we have the highest numbers of seed germination in the experimental site of northern side of raking and seeding area. In addition to these results, we found other many samples of "Regeneration sheltered by fallen trees" naturally growing up to sub-trees. From these two additional results, we verified our hypothesis. We made the manual that is useful to promote forest regeneration applying by our hypothesis.