Research on the Tending and Improvement of Secondary Evergreen Broadleaved Forests

The studies were carried on the Damao Mountain forest of Dexing City and Jinpen Mountain forest of Xinfeng County,Jiangxi,in 1985～1994. The results of 10 years of research on difference of secondary evergreen broadleaved forests show that:(1) The fast growing and highyield tree species such as Castanopsis carlesii,C.fargesii,C. eyrei,Schima suprca were selected for tending during the early stage of regeneration,and they made up a percentage of periodic increment in volume of above 10% more than that of therir species composition. The comparatively better density was 3 000 trees/ha;(2)Thinning of medium and high intensity presented significant effects in promoting the diameter and volume growth of the trees in young growth. The tree number and volume composition of the major fast growing species increased by 15% and 5% respectively. Thinning was conducted at an interval of 8～10 years and the density,after felling,was kept at 1 500 trees/ha;(3)Among middle age stands,after tending,the number compositions of C. castanopsis,C. fargesii,C. suprca and other less important species counted for 37%,33.9%,and 29.1% respectively,and 4 years later their volume percentages were 53.7%, 29.4% and 16.9% respectively,showing that density control can more effectively improve the productivity of C.carlesii,C. fargesii, etc. It is suitable to maintain a density of 600～800 trees/ha.