Influence of Site Preparation Models on Growth of Cunninghamia lanceolata Plantation Oriented for Large-diameter Timber Production

The experiment was carried out to realize the effect of different site preparation modes on the growth of Cunninghamia lanceolata.The results indicated that site preparation modes affected the growth of Cunninghamia lanceolata at the age of six as whole reclamation >band reclamation > hole reclamation, but the effects of those are different in different sites which are significant to improve characters of forest soil with low site index and insignificant to improve that of high site index(>18).The analysis of growth process indicated that site preparation modes such as whole reclamation and band reclamation can' t change site quality, the effects of site preparation would gradually reduce and not affect the total growth of Cunninghamia lanceolata significantly.