干旱区研究2025，Vol.42Issue(9)：1612-1627,16.DOI:10.13866/j.azr.2025.09.06
荒漠绿洲扩张区土壤微生物群落和多功能性的时效累积效应
Cumulative effects of time on soil microbial community and multifunctionality in a desert oasis expansion area:A case study of the Zhangye oasis
摘要
Abstract
Over the past 50 years,the population in the arid regions of Northwest China has rapidly increased,ac-companied by the expansion of farmland and shrubland at the edge of desert oases.However,few studies have ex-amined the succession and multifunctionality of soil microbial communities in the desert oasis expansion area.This study aimed to elucidate the ecological mechanisms underlying soil microbiome evolution and ecosystem functioning in arid land reclamation systems.We systematically investigated the spatiotemporal dynamics of soil microbial communities(bacteria and fungi:16S ribosomal ribonucleic acid and internal transcribed spacer ampli-con sequencing)and their functional relationships with the physicochemical properties of soil(nutrients,pH,elec-trical conductivity,moisture),enzymatic activities(C-,N-,P-cycling),and multifunctionality across a chronose-quence(5-30 years)of cultivated farmlands and Haloxylon ammodendron plantations in the Zhangye oasis expan-sion zone of Hexi Corridor.The results indicated that over a reclamation period of 30 years,the multifunctionali-ty of farmland soil first increased then decreased,reaching a maximum value at 10 years and exhibiting a signifi-cantly decreased value at 20 years(P＜0.05).Conversely,the soil multifunctionality of Haloxylon ammodendron plantations increased with time,reaching its maximum value at 30 years.In the farmland,the fungal community changed more significantly than the bacterial community.Soil multifunctionality was significantly negatively cor-related with relative abundance of pathotrophic fungi in the community(r=-0.655,P＜0.01)but positively corre-lated with α-diversity(r=0.508,P＜0.05)and network complexity(r=0.645,P＜0.05).Principal component analy-sis identified fungal pathogens as the primary factor influencing farmland soil multifunctionality.The contribu-tion of the bacterial community to changes in soil multifunctionality was stronger in shrubland than in farmland.Multifunctionality was significantly positively correlated with both α-diversity(r=0.546,P＜0.001)and network complexity of the bacterial community(r=0.542,P＜0.001),and these two were the primary factors influencing shrubland soil multifunctionality.The results of this study provide a scientific basis for the sustainable develop-ment of farmland and shrubland and the management of soil health in desert oasis expansion zones.关键词
荒漠绿洲扩张区/农田/林地/细菌/真菌/土壤多功能性/时效累积效应Key words
desert-oasis expansion zone/farmland/shrubland/bacteria/fungi/soil multifunctionality/time-de-pendent cumulative effect引用本文复制引用
赵丽娜,李昱达,缑倩倩,王国华,屈建军..荒漠绿洲扩张区土壤微生物群落和多功能性的时效累积效应[J].干旱区研究,2025,42(9):1612-1627,16.基金项目
国家自然科学基金面上项目(42171033)资助 （42171033）
