兴安落叶松天然次生林空间结构特征研究OA

[Objective]This research aims to achieve non-destructive interpretation and analysis of the spatial structure of natural secondary forests of Larix gmelinii from one dimension to multiple dimen-sions,and to comprehensively and systematically describe the structural characteristics of the forest stand from different levels and perspectives,to provide theoretical basis for the adjustment and optimization of its forest stand structure.[Method]The natural secondary forest of Larix gmelinii was taken as the research object.Based on the sample plot survey data and backpack laser scanning(BLS)data,the spatial structure parameters of the stand,such as uniform angle index,neighborhood comparison,mingling degree and crow-ding degree,were calculated to explore the spatial structure characteristics of the natural secondary forest of Larix gmelinii from the perspective of multivariate distribution.[Result]① The single tree segmenta-tion accuracy of BLS is 0.89(F=0.89).② The spatial distribution of trees in the sample plots is uniform and random;the differentiation of tree size is not obvious;the degree of spatial isolation is moderate and low mixing;the spatial intensity is very high.③ There are no trees with unreasonable combinations of four aspects in the research area.The relative frequency values of trees with unreasonable combinations of three aspects and two aspects are 1.75%and 3.99%,respectively.[Conclusion]The natural secondary forest of Larix gmelinii in the research area showed the structural problems of low mingling degree and single tree species.The BLS data can be used for spatial structure analysis of natural secondary forest of Larix gmeli-nii.The multivariate distribution of stand spatial parameters can be used to accurately obtain the unreason-able structure combination,which provides a scientific basis for the spatial adjustment of natural secondary forest of Larix gmelinii.