Analysis on the effect of forest tending of Cunninghamia lanceolata stand
In order to explore the effects of different tending modes on the growth of Cunninghamia lanceolata plantation,the 23-year-old C.lanceolata plantation was used as the research object,and four tending modes of control,mild thinning(15％),moderate thinning(30％)and severe thinning(45％)were carried out.The results showed that the average diameter at breast height(DBH),tree height,crown width and individual volume of stands treated with different tending modes were higher than those of the control group,and there were significant differences(P＜0.05)or extremely significant differences(P＜0.01)among the treatments.The individual volume was positively correlated with DBH and tree height.With the increase of thinning intensity,the growth of tree height and DBH of C.lanceolata was promoted,and the individual volume was increased,with the maximum increase of 130.43％.Different thinning intensities also lead to differences in stand growth status.The ranking of relative growth of stands was severe thinning＞moderate thinning＞mild thinning,among which the increase of DBH was the largest under severe thinning(38.33％),indicating that the cultivation of large-diameter timber of C.lanceolata could promote the growth of DBH through thinning.
万方数据
维普
