Analysis on the Early Growth Effect of Mixed Afforestation of Toona ciliate var. pubescensand Chinese fir

Early growth effects of the growth characters of height,diameter,diameter breast height,maximum crown width,stand volume per tree and stand volume were studied by mixed afforestation experiment of Toona ciliate var.pubescens and Chinese fir.The results showed that after four years afforestation,the ratio of T.ciliate var.pubescens and Chinese fir was 6:4,and the height and diameter,dbh,maximum crown width,stand volume per tree and stand volume of T.ciliate var.pubescens were the highest at 2 m×1.5 m,they were 6.97 m,8.77 cm,7.13 cm,3.10 m,0.0173 m³,34.60 m³·hm^-2 and 48.03 m³·hm^-2 respectively,which were 38.84%,21.30%,25.09%,42.86%,88.04%,1.66 times and 1.01 times higher than the average.The height,stand volume per tree and stand volume of Chinese fir were the highest,which were 5.33 m,0.0042 m³ and 34.68 m³·hm^-2 respectively,which were 22.53%,1.08 times and 2.18 times higher than the average.The diameter at ground,diameter breast height and the maximum crown width of Chinese fir in the mixed forest with 2 m×2 m of plant and row spacing were the highest,which were 10.67 cm,8.17 cm and 2.67 m respectively,which were 52.60%,52.36% and 47.33% higher than the average respectively.The total volume of thestand with 2 m×1.5 m spacing was the largest.In the mixed afforestation of T.ciliate var.pubescens and Chinese fir,the planting density should be larger,and the initial planting density was at 2505~3330 trees·hm^-2.The proportion of T.ciliate var.pubescens and Chinese fir should be increased in the mixture of T.ciliate var.pubescens and Chinese fir and Cunninghamia lanceolata