Strip transformation test zone with different bandwidths , namely the bandwidth of 10 m ( S1-S3 ) , 20 m ( S4-S6 ) and 30 m ( S7-S9 ) , each zone was divided into four sections , planting Pinus sibirica, Pinus sylvestris var.mongolica Litv., Larix gmelinii and Picea koraiensis Nakai, respectively, and the principle component analysis (PCA) method was used to establish the comprehensive evaluation system of forest transformation effects including 38 indices such as water holding ca-pacity of litter, soil physical and chemical properties , biodiversity, canopy structure, photosynthesis, regeneration, etc. The descending order of the effect of different transformation models was S 2 , S3 , S6 , S4 , S8 , S1 , S7 , CK, S5 , and S9 . Therefore ,the transformation model of S 2 was the best .
Low-quality Populus davidiana forestLow-quality forest transformation modelsStrip transformationDaxing' an Mountain