Effects of Disturbance Type on Soil Seed Banks in a Debris-Flow Prone Dry Valley of Northern Yunnan (in English) Impacts of Secondary Geological Disasters Induced by Wenchuan Earthquake on Soil Fauna Community Soil stoichiometry characteristics at different elevation gradients of a mountain in an area with high frequency debris flow: a case study in Xiaojiang Watershed, Yunnan An analysis on the genesis of debris flow in Taihang Mountains and ecological prevention countermeasure--Taking genesis of debris flow in Hebei Province in 1996 as an example Research progress in post-fire debris flow.