Effects of selective cutting on stand spatial structure of Acacia mangium and Cunninghamia lanceolata secondary forest in Jianfengling
In order to explore the spatial structure of the secondary forest in Jianfengling,Hainan Province,and study the effect of selective cutting on the spatial structure of the secondary forest of Acacia mangium and Cun-ninghamia lanceolata,this paper analyzed the spatial structure of 10 standard plots of Acacia mangium and Cunninghamia lanceolata secondary forest in Jianfengling Branch of Tropical Rainforest National Park by using three spatial structure indexes,such as mixing degree,size ratio and angular scale.In addition,the effects of se-lection on the stand spatial structure of secondary forest were analyzed by selecting Acacia mangium and Cun-ninghamia lanceolata in one test plot respectively.The results showed that:(1)the mixing degree of Acacia mangium and Cunninghamia lanceolata secondary forest was at the level of intensity and extreme intensity mix-ing;From the point of view of size ratio,the stand was mainly in the middle state;From the Angle scale,the stands are mainly distributed in clumps.(2)Both experimental plots showed that selective cutting could promote the optimization of stand spatial structure.When the stand spatial structure was unreasonable,the optimization effect was obvious after human intervention.When the stand spatial structure was stable,the effect of human in-tervention was weak.In production practice,measures can betaken to promote the optimization of stand struc-ture and the succession to the top community according to the spatial structure of different stands.
Stand spatial structureMixing degreeSize ratioAngular scale
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万方数据
