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Responses of soil microbial communities to freeze–thaw cycles in a Chinese temperate forest

Ecological Processes 2021年第1期10卷 903-920页

作者： Changpeng Sang Zongwei Xia Lifei Sun Hao Sun Ping Jiang Chao Wang Edith Bai CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China. University of Chinese Academy of Sciences Beijing 100049China. Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection College of Resources and EnvironmentLinyi UniversityLinyi 276000China. Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains Ministry of EducationSchool of Geographical SciencesNortheast Normal UniversityChangchun 130024China. Key Laboratory of Vegetation Ecology Ministry of EducationChangchun 130024China.

Background:freeze–thaw events are common in boreal and temperate forest ecosystems and are increasingly infuenced by climate *** microorganisms play an important role in maintaining ecosystem stability,but their responses to freeze–thaw cycles(FTCs)are poorly *** conducted a feld freeze–thaw experiment in a natural Korean pine and broadleaf mixed forest in the Changbai Mountain Nature Reserve,China,to determine the dynamic responses of soil microbial communities to ***:Bacteria were more sensitive than fungi to *** biomass,diversity and community composition were not signifcantly afected by freeze–thaw regardless of the *** initial freeze–thaw resulted in increased bacterial biomass,diversity,and copiotrophic taxa *** FTCs reduced the bacterial biomass and *** with the initial FTC,subsequent FTCs exerted an opposite efect on the direction of change in the composition and function of the bacterial *** water content,dissolved organic carbon,ammonium nitrogen,and total dissolved phosphorus were important factors determining bacterial community diversity and composition during ***,the functional potentials of the microbial community involved in C and N cycling were also afected by ***:Diferent stages of FTCs have diferent ecological efects on the soil environment and microbial *** FTCs changed the soil nutrients and water availability and then mainly infuenced bacterial community composition,diversity,and functional potentials,which may disturb C and N states in this temperate forest *** study also improves our understanding of microbial communities regulating their ecological functions in response to climate change.

关键词： freeze–thaw cycle Microbial diversity Microbial community composition Soil resource availability Functional potential

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Loss of total phenols from leaf litter of two shrub species: dual responses to alpine forest gap disturbance during winter and the growing season

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Journal of Plant Ecology 2020年第3期13卷 369-377页

作者： Wei He Wanqin Yang School of Life Science Taizhou UniversityTaizhou 318000ZhejiangChina Long-term Research Station of Alpine Forest Ecosystem Institute of Ecology&ForestrySichuan Agricultural UniversityChengdu 611130SichuanChina College of Horticulture and Forestry Sciences/Hubei Engineering Technology Research Center for Forestry Information Huazhong Agricultural UniversityWuhan 430070HubeiChina

Aims Alpine forest gaps can control understory ecosystem processes by manipulating hydrothermal ***,we aimed to test the role of alpine forest gap disturbance on total phenol loss(TPL)from the decomposing litter of two typical shrub species(willow,Salix paraplesia Schneid.,and bamboo,Fargesia nitida(Mitford)Keng f.).Methods We conducted a field litterbag experiment within a representative fir(Abies faxoniana Rehd.)forest based on‘gap openness treatments’(plot positions in the gap included the gap center south,gap center north,canopy edge,expanded edge and closed canopy).The TPL rate and litter surface microbial abundance(fungi and bacteria)of the two shrub species were measured during the following periods over 2 years:snow formation(SF),snow cover(SC),snow melting(ST),the early growing season(EG)and the late growing season(LG).Important Findings At the end of the study,we found that snow cover depth,freeze–thaw cycle frequency and the fungal copies g−1 to bacterial copies g−1 ratio had significant effects on litter *** abundances of fungi and bacteria decreased from the gap center to the closed canopy during the SF,SC,ST and LG periods and showed the opposite trend during the EG *** rate of TPL among plot positions closely followed the same trend as microbial abundance during the first year of *** addition,both species had higher rates of TPL in the gap center than at other positions during the first winter,first year and entire 2-year *** findings suggest that alpine forest gap formation accelerates litter TPL,although litter TPL exhibits dual responses to gap disturbance during specific critical *** conclusion,reduced snow cover depth and duration during winter warming under projected climate change scenarios or as gaps vanish may slow litter TPL in alpine biomes.

关键词： alpine forest gap freeze–thaw cycle fungi to bacteria ratio snow cover depth total phenols

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