Effects of different thinning types on the spatial structure of plain ecological plantation
In order to investigate the effects of different thinning types on the spatial struc-ture of ecological forest in Beijing Plain,nine permanent plots were established in Tongzhou District,Beijing,including representative forest types such as Salix matsudana,Styphn-olobium japonicum and Fraxinus chinensis.After selecting the target trees,each stand type was cut with interference,group and strip thinning respectively.The spatial structure of plain ecological forest and the effect of thinning on the spatial structure of target tree and stand were analyzed by using the optimized spatial ratio,angular scale and density.The Com-prehensive Spatial Structure Index(CSSI)was constructed to evaluate the effects of differ-ent thinning methods on the spatial structure of ecological forest in Beijing Plain.The results indicated that:(1)CSSI combined angular scale,density,and optimized size ratios,which was suitable for the spatial structure evaluation of ecological forests in Beijing Plain.(2)The spatial distribution pattern of plain ecological forests represented by S.japonicum,F.chinensis and S.matsudana was evenly distributed before thinning,most of the trees in a moderate state.The forests were relatively dense,and the spatial structure of F.chinensis and S.matsudana was better than that of S.j aponicum.(3)Thinning could significantly optimize the spatial structure of plain ecological plantation,especially for forests with high density such as S.japonicum.(4)For different tree species,the optimal thinning methods to improve the spatial structure were different,but for the spatial structure unit of target tree,the optimal degree of interference tree thinning was the most obvious.
plain ecological plantationspatial structurecrop tree managementthinningcom-prehensive index of spatial structure
NETL
NSTL
万方数据
