武汉工程大学学报2026，Vol.48Issue(2)：177-185,9.DOI:10.19843/j.cnki.CN42-1779/TQ.202404018
泥炭沉积磷脂脂肪酸(PLFAs)对温度的响应
Response of phospholipid fatty acids(PLFAs)in peat deposit to temperature variations
摘要
Abstract
In recent years,frequent extreme drought events have threatened the carbon sink function of terrestrial ecosystems,particularly peatlands.Temperature is a critical controlling factor during extreme drought events,as rising temperatures can disrupt the functional balance of wetland peat and subsequently alter the microbial community structure.However,our understanding of microbial responses to drought stress remains limited.In this study,incubation experiments were conducted on peat soil collected from Dajiu Lake in Shennongjia at different temperature gradients(5,15,25,and 35℃).The variation characteristics of microbial phospholipid fatty acids(PLFAs)in peat soil were investigated,along with the correlations between various environmental factors and PLFAs.Results showed that the PLFA contents of Actinobacteria(54.66-162.97 nmol/g),gram-positive bacteria(35.49-206.19 nmol/g),and gram-negative bacteria(51.73-513.87 nmol/g)in peat soil samples varied considerably across different incubation temperatures.Gram-negative bacteria were the dominant microbial group at all incubation temperatures and exhibited a positive correlation with temperature.At 25℃,the total PLFA content decreased with increasing incubation time,whereas at 15℃,it increased over time.The highest total PLFA content was observed at 25℃compared to 5,15,and 35℃,indicating that 25℃is the optimal temperature for microbial growth in peat sediments.Redundancy analysis revealed significant negative correlations between total organic carbon(TOC)and all PLFA types,suggesting that variations in TOC characteristics are the primary factor controlling the distribution of PLFAs in peat under different temperature conditions.Overall,temperature regulates changes in microbial biomass and community structure in peatlands.These findings provide a scientific basis for understanding soil carbon cycling processes in peat wetlands of the middle reaches of the Yangtze River and their responses to global climate change.关键词
磷脂脂肪酸/环境因子/微生物量/微生物群落结构Key words
phospholipid fatty acids/environmental factors/microbial biomass/microbial community structure分类
生物科学引用本文复制引用
冯俊俊,贾明敏,黄晓倩,谭严,黄雨泽,冯雪晴,薛建涛..泥炭沉积磷脂脂肪酸(PLFAs)对温度的响应[J].武汉工程大学学报,2026,48(2):177-185,9.基金项目
国家自然科学基金(41903066) （41903066）
流域关键带演化湖北省重点实验室开放基金(CZE2022F05) （CZE2022F05）
生物地质与环境地质国家重点实验室基金(GBL202402) （GBL202402）
