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Differences in respiration components and their dominant regulating factors across three alpine grasslands on the Qinghai−Tibet Plateau

引用

Advances in Climate Change Research 2023年第3期14卷 437-448页

作者： Ya-Li LIU Jun-Feng WANG Guan-Li JIANG Lu-Yang WANG Zi-Teng FU Ho-Jeong KANG Qing-Bai WU State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Beiluhe Observation and Research Station of Frozen Soil Engineering and Environment State Key Laboratory of Frozen Soil EngineeringNorthwest Institute of Eco-Environmental and ResourcesChinese Academy of SciencesLanzhou 730000China School of Civil and Environmental Engineering Yonsei UniversitySeoul 03722South Korea

Greenhouse gases(GHGs)emissions from high-cold terrestrial ecosystems underlain by permafrost on the Qinghai–Tibet Plateau(QTP)have received widespread ***,the dominant factors regulating ecosystem respiration(Re)and its components(soil respiration Rs and heterotrophic respiration Rh)and how the differences in carbon emissions from different ecotypes and seasons remain are still *** conducted a 2-year field investigation(August 2018 to October 2020)and applied the structural equation model(SEM)to clarify the changes in the factors controlling the respiration components during different *** results indicate that the R_(e)and its controlling factors in three alpine grassland ecosystems(alpine steppe,alpine meadow,and swamp meadow)vary with ***,autotrophic respiration(Ra)contributes the most to the seasonal changes in R_(e).The R_(e)gradually increases in the early growing season and rapidly decreases in the late growing *** remains relatively stable during the *** these seasonal variations in the respiration components,the dominant factors controlling R_(e)in the nongrowing season are the temperature of the atmosphere–soil interface(heat flux,atmospheric temperature,and soil temperature at 5 cm depth)and microbial activity(microbial carbon and pH)with the variable importance projections>*** the growing season,the dominant factors regulating R_(e),Rs,and Rh are the soil temperature with a standardized direct effect(SDE)of 0.424,soil nutrient conditions(total nitrogen and pH)with SDEs of 0.570–0.614,and microbial activity(microbial carbon)with a SDE of 0.591,*** addition,meteorological conditions have an important impact on the respiration components during the growing ***,the atmospheric vapor pressure is the dominant factor regulating the three respiration components(standardized total effects=0.44−0.53,p<0.001).The optimal soil water contents during the growing season(water c

关键词： Ecosystem respiration Respiration components atmospheric vapor pressure Alpine grassland Permafrost QinghaieTibet Plateau

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