应用生态学报2025，Vol.36Issue(2)：526-536,11.DOI:10.13287/j.1001-9332.202501.015
钾肥对甘蔗根际微生物多样性和群落构建过程的影响
Effects of potassium fertilizer on rhizosphere microbial diversity and community assembly in sugarcane
摘要
Abstract
The abundant and rare populations of microorganisms in the ecosystem play a crucial role in preventing pathogen transmission,regulating nutrient cycling,facilitating pollutant degradation.However,less attention has pain on the agroecosystems.We conducted a field experiment to evaluate the effects of different potassium applica-tion rates(0,75,150,225,300 kg·hm-2)on the microbial diversity,the driving factors and the microbial com-munity assembly process of the sugarcane rhizosphere through the high-throughput sequencing and ecological mode-ling techniques.The results showed that the potassium application exerted a significant effect on soil nutrient content and soil enzyme activities,which were highest at the application rate of 300 and 225 kg·hm-2,respectively.The abundant populations mainly concentrated in a few dominant species.Potassium application significantly affected species composition and community structures of the rhizosphere microorganisms.Under potassium application,soil urease,soil organic matter,and catalase were the key limiting factors,which could affect community structures of the abundant and rare microbial populations.The effects of potassium application on the rhizosphere bacterial com-munity were greater than those on the fungal community,and the effects on the abundant microbial community was greater than that on the rare one.Community assembly of bacteria and fungi were predominantly driven by determini-stic processes in the sugarcane rhizosphere,with the heterogeneity selection dominating in bacteria and the homoge-neity selection dominating in fungi.The deterministic processes played a key role in the abundant and rare commu-nities assembly.In conclusion,our results demonstrated that potassium application significantly affected soil nutrients and enzyme activities.The potassium application could enhance the diversity of abundant and rare popula-tions of bacteria and fungi and regulate soil microbial community assembly in the rhizosphere.关键词
甘蔗/钾肥/根际微生物群落/微生物丰富种群/微生物稀有种群/群落构建/土壤酶活性Key words
sugarcane/potassium fertilizer/rhizosphere microbial community/abundant microbial community/rare microbial community/community assembly/soil enzyme activity引用本文复制引用
张仲富,王禹童,艾静,刀静梅,李傲梅,邓军,吴建明,赵勇..钾肥对甘蔗根际微生物多样性和群落构建过程的影响[J].应用生态学报,2025,36(2):526-536,11.基金项目
本文由热带作物生物育种全国重点实验室重点项目(NKLTCB-YAAS-2024S04)、国家糖料产业技术体系抗逆栽培岗位科学家项目(CARS-17)、云南省农业科学院科研预研项目(2023KYZX-02)、云南省科技计划项目(202301BD070001-213)和云南省种子种业联合实验室项目(2022YFD2301100)资助. （NKLTCB-YAAS-2024S04）
