Study on Early Growth Characteristics of Choerospondias axillaris Plantation and Effect of Choerospondias axillaris and Cunninghamia lanceolata Mixed Stand

Taking 6-year-old Choerospondias axillari pure stand and mixed with Cunninghamia lanceolata in different patterns and 5-year-old Choerospondias axillaris stands in different densities as trial sites,the early growth pattern of Choerospondias axillaris,difference of plantation growth on different site conditions,the influence of different planting density on early growth of Choerospondias axillaris,the stand productivity when mixed with Cunninghamia lanceolata in different patterns,the difference of biomass and effect on soil fertility were studied.The results showed that Choerospondias axillaris grew fast in the early stage.On the site with medium fertility,the mean height increment,mean dbh and stock volume of 6-year-old Choerospondias axillaris were 8.53 m,9.74 cm and 86.08 m3 respectively.The growth differences under different site conditions were significant.The influence of planting density on the early growth of Choerospondias axillaris demonstrated the higher the density,the higher the stock volume and the height of branch,and the smaller the crown width.The Choerospondias axillaris stand mixed with Cunninghamia lanceolata could promote the growth of latter and benefit the fertility maintenance.The results showed that the pattern of Choerospondias axillaris and Cunninghamia lanceolata mixed in the ratio of 3∶1 had the highest productivity and biomass,i.e.stock volume 76.42 m3·hm-2,biomass 41.512 7 t·hm-2,which were 74.55% and 97.27% higher compared with that of pure Cunninghamia lanceolata stand respectively.It was proved that this pattern was worth to be extended.