STRUCTURES OF THE ARTIFICIAL MIXED FORESTS IN THE CLEAR CUT AREA OF SUBALPINE DARK CONIFEROUS FORESTS ON THE UPPER BRANCH OF THE MINJIANG RIVER

The structures of the artificial mixed forests with the age of 20～40 a in the clear cut area of subalpine dark coniferous forests on the upper branch of the Minjiang river have been studied in this paper.Main results indicated:(1) The coverage of each layer (tree,shrub,herb et al.) of the artificial forests were interrelated and interacted on one another,however,the coverage of the under layer/layers mainly depended on the coverage of the upper layer/layers or tree canopy.(2) The number and distribution of the species in the artificial forests were mainly decided by tree canopy,altitude and management class.(3) Many-shady tolerant plant species have occurred naturally,while the pioneer shrub species have been limited or superseded.(4) The growth laws of the D.B.H.and height of trees were Betula platyphylla>Picea asperata>Picea balfouriana>Larix mastersiana>Picea wilsonii.