江西农业大学学报2024，Vol.46Issue(3)：543-557,15.DOI:10.3724/aauj.2024049
2种马尾松混交林土壤微生物特性及其与团聚体稳定性耦合关系
Microbial characteristics in soil aggregates and their coupling with aggregates stability in two species of mixed Pinus massoniana forests
摘要
Abstract
[Objective]To investigate the differences in soil microbial community structure between the two types of Pinus massoniana mixed plantations forests,as well as the coupling relationship between soil aggregate stability and its microbial community structure,soil enzyme activity was measured in the two tpyes of forest stands.[Method]The P.massoniana and Cunninghamia lanceolata mixed forest,and P.massoniana,C.lanceolata and Quercus mixed forest in the Three Gorges Reservoir area were used as research objects,and the microbial community structure,growth and metabolism of soil aggregates of different grain sizes in the 0-10 cm soil layer were compared and analysed.[Result](1)the stability of soil aggregates,total microbial biomass and community diversity were not significantly different between the two P.massoniana mixed forests;(2)the growth and metabolism of soil microorganisms in the two P.massoniana mixed forests were limited by phosphorus(P)in terms of enzyme stoichiometry;(3)the biomass of soil aggregates of arbuscular mycorrhizal fungi,fungi,actinomycetes,Gram-positive bacteria and Gram-negative bacteria did not differ significantly between the different grain sizes;(4)Soil total potassium content had the greatest influence on the structure of the microbial community.N-acetyl-β-D-glucosidase(NAG)activity in large aggregates was a key factor driving the stability of soil aggregates.[Conclusion]To improve the soil quality of the Pinus massoniana forest in the Three Gorges reservoir area,more attention should be paid to the response of NAG activity to environmental changes.To mitigate the effects of P limitation on vegetation growth and development,tree species with greater P partitioning capacity and higher P use efficiency can be created in plantation forests of P.massoniana.关键词
三峡库区/马尾松混交林/团聚体稳定性/酶化学计量/微生物养分限制/微生物群落结构Key words
Three Gorges Reservoir/Pinus massoniana mixed forest/aggregate stability/enzyme stoichiom-etry/microbial nutrient limitation/microbial community structure分类
农业科技引用本文复制引用
杨洪炳,肖文发,曾立雄,雷蕾,李春蕾..2种马尾松混交林土壤微生物特性及其与团聚体稳定性耦合关系[J].江西农业大学学报,2024,46(3):543-557,15.基金项目
"十三五"国家重点研发计划项目(2016YFD0600200)Project supported by the"Thirteenth Five-Year"National Key R&D Program Project(2016YFD0600200)公益性行业(气象)科研专项项目(GYHY201406035)同时对本研究给予了资助,谨致谢意! （2016YFD0600200）
