短期OTC增温对晋北农牧交错带温性草地土壤微生物的影响  

Responses of Soil Microorganism to Short-Term OTC Warming in A Temperate Grassland of Agro-pastoral ecotone in Northern Shanxi

作　　者：齐志远 马腾飞 伊李凯 宁亚楠 武帅楷 刁华杰 苏原 徐沛东 郝杰[1,2,3] 董宽虎 QI Zhi-yuan;MA Teng-fei;YI Li-kai;NING Ya-nan;WU Shuai-kai;DIAO Hua-jie;SU Yuan;XU Pei-dong;HAO Jie;DONG Kuan-hu(College of Grassland Science,Shanxi Agricultural University,Taigu,Shanxi Province 030801,China;Shanxi Key Laboratory of Grassland Ecological Protection and Native Grass Germplasm Innovation,Taigu,Shanxi Province 030801,China;Youyu Loess Plateau Grassland Ecosystem Research Station,Youyu,Shanxi Province 037200,China)

机构地区：[1]山西农业大学草业学院,山西太谷030801 [2]草地生态保护与乡土草种质创新山西省重点实验室,山西太谷030801 [3]山西右玉黄土高原草地生态系统国家定位观测研究站,山西右玉037200

出　　处：《草地学报》2024年第6期1789-1799,共11页Acta Agrestia Sinica

基　　金：国家重点研发计划子课题(2022YFF1302801);国家自然科学基金(U22A20576,32301375);山西省科技厅平台专项:草地生态保护与乡土草种质创新山西省重点实验室建设项目(202104010910017)资助。

摘　　要：土壤微生物作为参与生物地球化学循环的重要生物类群,对陆地生态系统至关重要,但温度升高如何影响农牧交错带温性草地土壤微生物群落的丰度仍不清楚。本研究依托山西右玉黄土高原草地生态系统定位观测研究站2017年建立的开顶式同化箱(Open-Top chamber,OTC)增温实验平台,处理5年后进行土壤样品的采集,测定土壤真菌和细菌的丰度以及土壤微生物生物量碳(Microbial biomass carbon,MBC)和氮(Microbial biomass nitrogen,MBN)含量等指标,探讨农牧交错带温性草地土壤微生物对不同增温处理的响应。结果表明:增温显著降低土壤真菌丰度,对土壤微生物生物量碳、氮含量没有产生显著影响,细菌丰度随着增温处理的温度上升呈现先上升再下降的趋势;增温处理下,微生物生物量与土壤全磷、硝态氮和可溶性有机氮含量呈正相关关系。未来需要加强针对气候变化对该类脆弱生态系统影响的监测,为农牧交错带温性草地管理提供预警及科学依据。As an important group of organisms involved in biogeochemical cycles,soil microorganisms play an important role in terrestrial ecosystems.However,how temperature rise affects the abundance of soil microbial communities in temperate grasslands in the agro-pastoral ecotone remains unclear.In this study,soil samples were collected after 5 years of treatment based on the Open-Top chamber(OTC)temperature increase experimental platform established in 2017 at Youyu Loess Plateau Grassland Ecosystem Positioning Observation and Research Station in Shanxi Province.The abundance of soil fungi and bacteria as well as microbial biomass carbon(MBC)and nitrogen(MBN)were measured to investigate the response of soil microorganisms to different warming treatments in the temperate grassland in the farming-grazing zone.The results showed that increasing temperature significantly decreased the abundance of soil fungi,and the abundance of bacteria increased first and then decreased with the gradient of increasing temperature,which had no significant effect on soil microbial biomass carbon and nitrogen.The microbial biomass was positively correlated with soil total phosphorus,nitrate nitrogen and soluble organic nitrogen.In the future,it is necessary to strengthen the monitoring of such vulnerable ecosystems in response to climate change,so as to provide early warning and scientific basis for the management of temperate grassland in the agro-pastoral ecotone.

关 键 词：环境因子 微生物生物量 细菌 增温 真菌 

分 类 号：S154.3[农业科学—土壤学]