应用生态学报2025，Vol.36Issue(12)：3659-3667,9.DOI:10.13287/j.1001-9332.202512.018
土壤改良剂对白浆土白浆层土壤物理结构及微生物群落的调控效应
Regulation of soil amendments on soil physical structure and microbial community in albic layer of albic soil
摘要
Abstract
Albic soil is a typical low yield soil with barrier layer in Northeast China.Due to the dense structure of the barrier layer and the difficulties in water and gas transmission,it restricts crop growth and yield formation.We set up a manipulative experiment,with no amendment(CK)as the control to explore the effects of three amend-ments:composite amendment(modified bentonite+modified humic acid+calcium oxide,GL),modified bentonite(PR),and modified humic acid(HA)on the physical structure and microbial diversity of albic layer.The results showed that the improvement agent significantly reduced soil bulk density of the albic layer by 3.6％to 5.4％,in-creased the porosity by 4.7％to 7.0％,and increased the stability of aggregates.Among them,GL treatment en-hanced the connectivity of pores by loosening soil particles.PR treatment could improve soil aeration in the short term,but with insufficient stability of aggregate structure.HA treatment enhanced aggregate stability through colloid filling,but had limited improving effect on pore connectivity.Different amendments changed soil microbial commu-nity composition in the albic layer.GL treatment significantly increased bacterial diversity,with a 12.9％increase in richness,with the community under which being dominated by Proteobacteria,Bacteroidetes,and Actinobacte-ria.The PR treatment increased bacterial richness by 17.4％,with the community under which being dominated by Actinobacteria,Proteobacteria,and Ascomycota.HA treatment significantly increased fungal species richness,with a 41.0％increase in Chao1 index.The dominant fungal communities were Ascomycota,Basidiomycota,and Zygo-mycota.Soil porosity was positively correlated with fungal abundance(r=0.62),and bulk density was positively correlated with actinomycete abundance(r=0.58).In summary,GL treatment had a good physical and biological synergistic effect and was more suitable for loosening the albic layer,improving soil permeability.PR treatment could improve the aeration and microbial activity of the albic layer in the short term,but its promotion effect on the stabi-lity of aggregate structure was limited.Long-term application may facilitate soil structure loosening.HA treat-ment was suitable for soils with high water retention requirements and the need to enhance aggregate stability.关键词
白浆土/土壤改良剂/土壤结构/孔隙特征/微生物多样性Key words
albic soil/soil amendment/soil structure/pore characteristic/microbial diversity引用本文复制引用
王玲莉,石元亮,石淏心,张蕾,武志杰,宋玉超,田立彬,姜宇..土壤改良剂对白浆土白浆层土壤物理结构及微生物群落的调控效应[J].应用生态学报,2025,36(12):3659-3667,9.基金项目
本文由国家重点研发计划项目(2022YFD1500804)和中国科学院战略性先导科技专项(A类)(XDA28100203)资助. （2022YFD1500804）
