不同水位控制条件下泥炭沼泽土壤微生物群落及酶活性  

Soil Microbial Community and Enzyme Activities of Peatlands under DifferentWater Table Control Conditions

作　　者：曾子怡 王一诺 王国栋[2] 徐志伟[3] 王升忠 ZENG Ziyi;WANG Yinuo;WANG Guodong;XU Zhiwei;WANG Shengzhong(Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains,Ministry of Education,School of Geographical Sciences,Northeast Normal University,Changchun 130024,Jilin,P.R.China;Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102,Jilin,P.R.China;Institute of Peat and Mire Research,State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration,Northeast Normal University,Changchun 130024,Jilin,P.R.China)

机构地区：[1]东北师范大学地理科学学院,长白山地理过程与生态安全教育部重点实验室,吉林长春130024 [2]中国科学院东北地理与农业生态研究所,吉林长春130102 [3]东北师范大学泥炭沼泽研究所,国家环境保护湿地生态与植被恢复重点实验室,吉林长春130024

出　　处：《湿地科学》2023年第6期887-896,共10页Wetland Science

基　　金：国家自然科学基金项目(32071599和32241033);吉林省自然科学基金项目(20210101397JC);吉林省教育厅项目(JJKH20231308KJ)资助。

摘　　要：在白江河泥炭沼泽采集0~50 cm深度泥炭柱样品,通过室内水位控制实验,以持续淹水(对照)、持续低水位和波动水位,模拟短期排水条件,分析短期排水对泥炭土壤理化性质、活性有机碳组分、微生物群落以及酶活性的影响,并探讨泥炭沼泽土壤微生物生物量、酶活性对短期排水的响应及其影响因素。研究结果表明,持续低水位和波动水位处理下泥炭土壤pH减小,持续低水位处理下0~20 cm深度土壤易氧化有机碳和微生物量碳含量显著减小,而>20~50 cm深度土壤易氧化有机碳含量增大;波动水位处理下泥炭土壤微生物量碳含量显著大于持续低水位处理;泥炭土壤含水量、全氮含量和碳磷比是影响土壤活性有机碳组分变化的主要因素;持续低水位处理下泥炭土壤微生物磷脂脂肪酸含量小于对照处理和波动水位处理;除真菌外,各类型微生物磷脂脂肪酸含量在波动水位处理下都大于对照;持续低水位处理下0~20 cm深度土壤氧化酶活性无显著变化,水解酶活性都增强,而>20~50 cm深度土壤多酚氧化酶和水解酶活性减弱;与持续低水位处理相比,波动水位处理后0~20 cm深度土壤过氧化物酶活性增强,而水解酶活性减弱;土壤有机碳和全氮含量是影响土壤微生物磷脂脂肪酸的主要因素,而土壤微生物量碳含量是影响土壤酶活性的主要因素。Water table,which determines the mechanism and intensity of peat soil carbon cycling,is the most important environmental properties in the degraded peatlands.In this study,the 0-50 cm peat columns were collected from the Baijianghe peatland in Changbai Mountains and incubated at different water tables in laboratory.There were 3 water table treatments:continuous flooding,continuous low water table,and fluctuating water table.Soil physical and chemical properties,active organic carbon components,microbial phospholipid fatty acids,and enzyme activities were analyzed to reveal the variation patterns and mechanisms of soil microbial community and activities among different water tables.The results showed that,compared with continuous flooding treatment,soil pH was decreased after short-term drainage.Compared with continuous flooding,soil easily oxidized organic carbon and microbial biomass carbon concentrations of 0-20 cm were significantly decreased,but the easily oxidized organic carbon of above 20-50 cm increased under continuous low water table.Soil microbial biomass carbon concentration was significantly higher under fluctuating water table treatment than that under continuous low water table treatment.Soil water content,total nitrogen,and carbon/phosphorus ratio were the main factors affecting the change of soil active organic carbon components.Soil microbial phospholipid fatty acid concentrations were significantly lower under continuous low water table treatment than those under continuous flooding and fluctuating water table treatment.Except fungi,different type of microbial phospholipid fatty acids showed a trend of fluctuating water table was higher than continuous flooding.Compared with continuous flooding,the continuous low water table treatment had no significant effects on soil oxidase activities,but was found to increase the soil hydrolytic enzyme activities of 0-20 cm.Soil activities of polyphenol oxidase and hydrolase of above 20-50 cm showed a trend of continuous flooding was higher than continuous

关 键 词：泥炭沼泽 持续低水位 水位波动 微生物磷脂脂肪酸 氧化酶 水解酶 

分 类 号：X172[环境科学与工程—环境科学]