Community Structure and Plant Diversity Characteristics of Riparian Forests on Upper Reaches of Wenyuhe River Community types and ecological adaptation characteristics of the riparian forest in upper reach of Wenyuhe Watershed Succession and prediction of the riparian forest in upper\|reach of Wenyuhe Watershed Environmental gradient analysis and succession process of riparian forest communities in upper reach of Wenyuhe watershed Seed rain, soil seed bank and regeneration of Larix principis-rupprechtii stands in the Upper Reaches of Wenyuhe