干旱区地理2024，Vol.47Issue(10)：1724-1734,11.DOI:10.12118/j.issn.1000-6060.2024.322
沙区生物土壤结皮演替对表层土壤养分和微生物群落组成的影响
Effects of biological soil crust succession on soil nutrients,microbial community composition in desert regions
摘要
Abstract
Biological soil crusts(BSCs),a critical component of dryland ecosystems,mediate interactions be-tween biotic and abiotic factors on the soil surface.This study examines the soil physicochemical properties,mi-crobial community composition,and enzyme activities of different types of BSCs—algae-dominated(AC),li-chen-dominated(LC),and moss-dominated(MC)—along with the underlying soil layers(0-2 cm and 2-5 cm)at the southern edge of the Tengger Desert,Inner Mongolia,China.We analyzed variations in microbial community composition and enzyme activities during BSCs succession and explored the relationship between these dynam-ics and soil physicochemical properties.Results revealed that the contents of soil organic carbon(SOC),nitrogen(N),phosphorus(P),silt,clay,and electrical conductivity(EC)in both crust and underlying soils increased signif-icantly as BSCs progressed toward moss dominance,while these variables decreased with greater soil depth.Con-versely,pH,bulk density,and sand content exhibited opposing trends.The total phospholipid fatty acids(PLFAs),as well as bacterial and fungal PLFAs,were highest in MC and lowest in AC,with MC exhibiting 24%,15%,and 39%higher values than AC,respectively.Compared to AC,the fungal-to-bacterial PLFAs ratio(F:B)in MC increased by 20%.The microbial community composition in the 0-2 cm and 2-5 cm soil layers followed similar patterns,though all parameters significantly declined with depth.Enzyme activities—sucrase,catalase,cellulase,amylase,polyphenol oxidase,peroxidase,urease,and alkaline phosphatase—showed an upward trend with BSCs succession,but decreased with soil depth.Further analysis revealed that microbial community compo-sition and enzyme activities were significantly positively correlated with SOC,N,P,EC,and clay content,but negatively correlated with pH,bulk density,and sand content.Structural equation modeling suggested that chang-es in soil chemical properties driven by BSCs succession were the key determinants of microbial community structure and enzyme activities.关键词
微生物群落/酶活性/生物土壤结皮/演替/沙区Key words
microbial community/enzyme activity/biological soil crusts/succession/desert region引用本文复制引用
贺郝钰,刘蔚,常宗强,侯春梅,孙力炜,迟秀丽..沙区生物土壤结皮演替对表层土壤养分和微生物群落组成的影响[J].干旱区地理,2024,47(10):1724-1734,11.基金项目
国家重点研发计划项目(2022YFF1303301) （2022YFF1303301）
甘肃省科技重大专项计划项目(23ZDFA018)资助 （23ZDFA018）
