模拟增温对川西北高寒草甸植物群落结构、生产力及土壤理化特征的影响  

Effects of simulated warming on plant community structure,productivity and soil physical and chemical characteristics of alpine meadow in northwest Sichuan Province

作　　者：赵文学 薛国敏 吴忌 吉使阿微 田莉华[1,2] ZHAO Wen-xue;XUE Guo-min;WU Ji;JI-SHI A-wei;TIAN Li-hua(School of Grassland Resources,Southwest Minzu University,Chengdu 610041,China;Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station,Chengdu 610041,China)

机构地区：[1]西南民族大学草地资源学院,四川成都610041 [2]四川若尔盖高寒湿地生态系统国家野外科学观测研究站,四川成都610041

出　　处：《西南民族大学学报（自然科学版）》2024年第2期125-134,共10页Journal of Southwest Minzu University(Natural Science Edition)

基　　金：国家重点研发计划子课题(2019YFC0507702);财政部和农业农村部国家现代农业产业技术体系(CARS⁃34);西南民族大学“双一流”项目(CX20230160)。

摘　　要：以川西北高寒草甸植物群落为研究对象,利用开顶式生长室(OTC)模拟了5年增温处理对高寒草甸群落结构、生产力及土壤理化特征的影响.研究发现,增温处理后群落高度显著增加69.80%,群落丰富度指数、多样性指数以及均匀度指数分别显著降低了24.81%、14.51%和3.7%,增温后的群落盖度与生产力无显著变化.分析群落功能群组成发现,增温后禾本科植物平均高度、盖度和重要值较对照分别显著增加89.26%、162.03%和89.47%;莎草科植物平均高度和重要值分别显著增加40.01%和40.63%,盖度无显著变化;杂类草植物平均高度显著增加33.27%,但盖度和重要值分别显著降低52.95%和38%.相关性分析表明增温处理后,禾本科植物生产力与群落高度显著正相关,杂类草生产力与群落高度、土壤速效磷显著负相关,与群落丰富度、多样性、均匀度以及土壤pH显著正相关.研究表明,5年增温处理对川西北高寒草甸群落结构产生了显著影响,对群落生产力和土壤理化特征(除pH外)未产生显著影响.Taking the alpine meadow plant community in northwest Sichuan as the research object,the effects of five⁃year war⁃ming treatment on the alpine meadow community structure,productivity and soil physical and chemical characteristics were sim⁃ulated by using the open⁃top growth chamber(OTC).The present study found that the community height increased significantly by 69.80%after warming treatment,and the community richness index,diversity index and evenness index decreased signifi⁃cantly by 24.81%,14.51%and 3.7%respectively,but the community coverage and productivity did not change significantly after warming treatment.By analyzing the composition of functional groups in the community,it was found that the average height,coverage and important value of Grasses plants increased significantly by 89.26%,162.03%and 89.47%respectively after warming.The average height and important value of Sedges plants increased significantly by 40.01%and 40.63%respec⁃tively,and the coverage did not change significantly.The average height of Forbs grass plants increased by 33.27%,but the cov⁃erage and important value decreased by 52.95%and 38%respectively.Correlation analysis showed that after warming treat⁃ment,the productivity of grasses plants was significantly positively correlated with community height,the productivity of forbs grasses was significantly negatively correlated with community height and soil available phosphorus,and was significantly posi⁃tively correlated with community richness,diversity,uniformity and soil pH.Therefore,this study showed that the five⁃year war⁃ming treatment had a significant effect on the community structure of alpine meadow in northwest Sichuan,but had no significant effect on community productivity and soil basic physical and chemical characteristics(except for pH).

关 键 词：增温 高寒草甸 群落结构 土壤理化因子 生产力 

分 类 号：Q948[生物学—植物学]