模拟增温对五台山亚高山草甸植物群落与土壤性质的影响  

Effects of Warming on Plant Communities and Soil Properties of Subalpine Meadow in Wutai Mountain,Shanxi Province,China

作　　者：郝爱华 罗正明[1] 田志杰 郑海霞[1] 郑庆荣[1] HAO Ai-hua;LUO Zheng-ming;TIAN Zhi-jie;ZHENG Hai-xia;ZHENG Qing-rong(Department of Geography,Xinzhou Normal University,Xinzhou,Shanxi Province 034000,China;Department of Biological Sciences,Xinzhou Normal University,Xinzhou,Shanxi Province 034000,China)

机构地区：[1]忻州师范学院地理系,山西忻州034000 [2]忻州师范学院生物系,山西忻州034000

出　　处：《草地学报》2023年第12期3793-3801,共9页Acta Agrestia Sinica

基　　金：五台山文化生态协同创新中心1331项目(00000342);山西省高等学校人文社会科学重点研究基地项目(2022J027);山西省高等学校科技创新项目(2021L465);山西省应用基础研究计划项目(202203021221225)资助。

摘　　要：本研究设计开顶式小室(Open top chambers,OTCs)增温控制试验,用以探明增温对五台山亚高山草甸生长季植物群落和土壤理化性质的影响,并采用冗余分析(Redundancy analysis,RDA)揭示植物群落与表层土壤性质的关系。结果表明:增温以后物种丰富度(Species richness,SR)显著增加(P<0.05);对照样地矮生嵩草(Kobresia humilis)的重要值(Importance value,IV)最高(0.31),增温样地珠芽蓼(Polygonum viviparum)的重要值最高(0.15);增温处理下地上生物量(Aboveground biomass,AGB)显著增加了约2.83倍(P<0.05),地下生物量(Belowground biomass,BGB)显著下降了约35.96%(P<0.05),土壤水分(Soil moisture,SM)、有机碳(Soil organic carbon,SOC)和总氮(Total nitrogen,TN)分别显著下降了24.58%,11.86%和19.80%(P<0.05);增温处理下土壤水分和总氮与地上生物量显著正相关(P<0.01),pH值与地下生物量显著正相关(P<0.05)。增温使五台山亚高山草甸群落结构发生改变,土壤表层趋向干旱化和贫瘠化。To explore the effects of warming on the plant communities and soil physicochemical properties of subalpine meadows in the growing season in Wutai Mountain,a warming experiment using the open-top chambers(OTCs)was set up.Redundancy analysis(RDA)was used to reveal the relationship between plant communities and soil properties.The results showed that after three years of warming,species richness(SR)increased significantly(P<0.05).The importance value(IV)of Kobresia humilis was the highest(0.31)in the controlled plots,but IV of Polygonum viviparum was the highest(0.15)in the warmed plots.The OTCs significantly(P<0.05)increased the above-ground biomass(AGB)by~2.83 times,but significantly(P<0.05)decreased the below-ground biomass(BGB)by 35.96%.Under warming treatment,soil moisture(SM),soil organic carbon(SOC),and total nitrogen(TN)significantly(P<0.05)decreased by 24.58%,11.86%,and 19.80%,respectively.Under the warming treatment,SM and TN had significantly positive correlation with AGB(P<0.01);there was a significantly positive correlation between pH and BGB(P<0.05).This study demonstrated that the community structure changed and the surface soil tended to become arid and barren under warming conditions for the subalpine meadows in Wutai Mountain.

关 键 词：亚高山草甸 群落结构 植物多样性 土壤性质 模拟增温 五台山 

分 类 号：Q948.1[生物学—植物学]