四川农业大学学报2025，Vol.43Issue(4)：915-921,7.DOI:10.16036/j.issn.1000-2650.202402586
2种人工混交林林分空间结构与土壤有机碳的关系
Relationship between Stand Spatial Structure and Soil Organic Carbon in Two Artificial Mixed Forests
摘要
Abstract
[Objective]This study examined how stand spatial structure in different types of mixed forests influences soil organic carbon content(SOC),with the aim of providing a scientific basis for optimizing stand structure to enhance SOC accumulation.[Method]Two 11-year-old mixed forest types were inves-tigated,including a broad-leaved mixed forest of Castanopsis hystrix Miq,Ilex rotunda Thunb,Michelia chapensis Dandy,Liquidambar formosana Hance,and Magnoliaceae glanca Blume,as well as a conifer-broadleaf mixed forest of Cunninghamia lanceolata Hook,Eucalyptus,Magnoliaceae glanca Blume,Schima superba Gardn.et Champ,and Cinnamomum bodinieri Levl.We compared the spatial structure of forest stands and SOC content between the two forest types,and further analyzed correlations between SOC and spatial structure attributes.[Result]① SOC content in the broad-leaved mixed forest(12.79 g/kg)was significantly higher than that in the conifer-broadleaf mixed forest(10.36 g/kg),and both forest types showed the characteristics of surface enrichment.②The mean angle index of the broad-leaved and conifer-broadleaf stands was 0.500 6 and 0.499 8,respectively,indicating a random tree distribution pattern in both.The average size ratios were 0.496 4 and 0.490 5,respectively,suggesting little differen-tiation in tree dominance.The mean mingling index was 0.745 2 in the broad-leaved stand and 0.471 5 in the conifer-broadleaf stand,respectively belonging to intensive mixing and moderate mixing.The compe-tition index was lower in the broad-leaved stand(1.24)than in the conifer-broadleaf stand(2.17).③ SOC content was significantly positively correlated with soil total nitrogen and mingling index,but sig-nificantly negatively correlated with competition index.[Conclusion]① SOC content was significantly higher in broad-leaved mixed forests than in conifer-broadleaf mixed forests,suggesting that broad-leaved mixtures are more favorable for SOC accumulation.② Stand structural optimization that increases tree secies mingling while reducing inter-tree competition is conducive to enhancing SOC content.关键词
林分类型/土壤有机碳/相关性/林分空间结构/竞争指数Key words
forest type/soil organic carbon/correlation/forest spatial structure/competitive index分类
农业科技引用本文复制引用
黄焕强,邱展鹏,古洛炜,肖龙龙,谭莎,林娜..2种人工混交林林分空间结构与土壤有机碳的关系[J].四川农业大学学报,2025,43(4):915-921,7.基金项目
广东省林业科技创新项目(2023KFCX001). （2023KFCX001）
