四川农业大学学报2025，Vol.43Issue(4)：933-942,958,11.DOI:10.16036/j.issn.1000-2650.202408477
巨桉纯林皆伐后营建混交林初期对土壤团聚体稳定性及有机碳含量的影响
Effects of Constructing Mixed Forests in the Early Stage on Soil Aggregate Stability and Organic Carbon Content after Clear-Cutting of Eucalyptus grandis Pure Forest
摘要
Abstract
[Objective]This study provides empirical evidence for the sustainable development of artifi-cial forests by elucidating the impact of converting monoculture plantations into mixed-species forests on soil aggregate stability and organic carbon content.[Method]Three mixed forest types were established following clear-cutting of pure Eucalyptus grandis plantations,namely Amygdalus persica'Atropurpurea'+Malus×micromalus(stand type Ⅰ),Cunninghamia lanceolata+Phoebe zhennan+Amygdalus persica'Atropurpurea'(stand type Ⅱ),Camphora officinarum+Metasequoia glyptostroboides(stand type Ⅲ),alongside a control group of pure E.grandis forest(CK).Four years after stand establishment,we deter-mined soil physical and chemical properties,aggregate size distribution,aggregate stability indices,ag-gregate organic carbon content,and its contribution to total soil organic carbon(SOC)in the 0-20 cm and 20-40 cm soil layers of each stand type.[Result]① Compared to the CK treatment,stand type Ⅲ significantly promoted the conversion of small aggregates into>2 mm macro-aggregates across both soil layers,markedly increasing mean weight diameter(MWD),geometric mean diameter(GMD),and the macroaggregate proportion(R0.25)in each soil layer,while significantly reducing fractal dimension(D)and the percentage of aggregate disruption(PAD).The mass ratio of>2 mm aggregates was identified as the key environmental factor driving changes in soil aggregate stability.② The organic carbon content of soil aggregates in each stand type and each soil layer ranged from 7.54 to 27.06 g/kg,with aggregates larger than 2 mm serving as the main SOC carriers.Stand type Ⅲ significantly enahnced the organic car-bon content of>2 mm aggregates and their contribution to SOC in both soil layers,with SOC identified as the key environmental driver of aggregate organic carbon changes.③ Stand types Ⅰ and Ⅱ had no sig-nificant effects on aggregate size distribution,aggregate stability,aggregate organic carbon content and its contribution to SOC.[Conclusion]The C.officinarum+M.glyptostroboides mixed forest markedly improves soil structural stability and carbon sequestration during the early stage of mixed forest establish-ment.Therefore,this mix forest type is recommended for transforming E.grandis monocultures in the study area.关键词
巨桉人工林/混交林/土壤团聚体稳定性/土壤团聚体有机碳Key words
Eucalyptus grandis plantation/mixed forest/soil aggregate stability/soil aggregate organic carbon分类
农业科技引用本文复制引用
蒋明朱,樊戢,李哲,徐晶楠,肖欢,胡峻嶍,周世兴,黄从德..巨桉纯林皆伐后营建混交林初期对土壤团聚体稳定性及有机碳含量的影响[J].四川农业大学学报,2025,43(4):933-942,958,11.基金项目
世界银行贷款长江上游森林生态系统恢复项目(510201202038467). （510201202038467）
