西南林业大学学报2023，Vol.43Issue(11)：91-96,6.DOI:10.11929/j.swfu.202209052
辽东山区胡桃楸次生林垂直结构特征研究
Analysis on Vertical Structure Characteristics of Juglans mandshur-ica Secondary Forest in Eastern Liaoning Mountainous Area
摘要
Abstract
Taking the secondary forest of Juglans mandshurica in the mountainous area of eastern Liaoning Province as the research object,the stand was divided into upper,middle and lower layers according to the can-opy competition height(CCH),and on this basis,the tree species composition,diameter class structure and spatial structure characteristics of each forest layer were analyzed.The result showed that the average tree heights of the upper,middle and lower layers were 14.86-17.02,11.18-12.77 m and 7.33-8.01 m,respectively.The ANOVA results showed that there were significant differences among tree heights of different forest layers,with excellent layering results.The upper forest layer was the main contributor to the stand volume,accounting for 61.86％-78.7％,followed by the middle layer,and the lowest in the lower layer.The diameter distribution curve differs between forest layers,with the lower layer showing an inverse'J'curve,the middle layer a left-skewed single-peaked curve and the upper layer a multi-peaked curve.The stand was in a state of transition from moder-ate to strong mixing.The mean mixedness of the upper and middle layers in 3 samples was 0.512 and 0.574 re-spectively,which was moderate mixedness,while the mean mixedness of the lower layer was 0.671,which was close to strong mixedness,and the mean mixedness of each forest layer showed an increase with decreasing ver-tical height.Sample plots 1 and 3 are aggregated and sample plot 2 is randomly distributed.Both stand aggrega-tion and competition index increased as the vertical height of the stand decreased.The secondary forest of J.mandshurica is relatively stable by judging from the vertical structure of the forest,and its future succession direc-tion is likely to be a mixed coniferous forest with Larix gmelinii and J.mandshurica as the dominant species or a mixed broadleaf forest with J.mandshurica,Quercus mongolica and Fraxinus rhynchophylla,where the domin-ant species J.mandshurica is less capable of regeneration and needs to be artificially promoted for natural regen-eration.关键词
胡桃楸/次生林/垂直结构/空间结构Key words
Juglans mandshurica/secondary forest/vertical structure/spatial structure分类
农业科技引用本文复制引用
董莉莉,赵济川,汪成成,刘红民,胡博,高英旭..辽东山区胡桃楸次生林垂直结构特征研究[J].西南林业大学学报,2023,43(11):91-96,6.基金项目
辽宁省自然科学基金面上项目(2022-MS-060)资助 （2022-MS-060）
辽宁省应用基础研究计划(2022JH2/101300114)资助 （2022JH2/101300114）
国家自然科学基金面上项目(32071674)资助. （32071674）
