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Response mechanism of soil microorganisms to simulated precipitation in the source wetland of Qinghai Lake

Ecological Processes 2024年第2期13卷 61-71页

作者： Xinye Wang Ni Zhang Kelong Chen Tiexi Chen Desheng Qi Yuanxi Ma School of Geographical Sciences Qinghai Normal University national Positioning Observation and Research station of Qinghai Lake Wetland ecosystem in Qinghai National Forestry and Grassland Administration Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation(Ministry of Education) Qinghai Normal University School of Geographical Sciences Nanjing University of Information Science and Technology Qinghai Provincial land spatial Planning Research Institute

Background Changes in precipitation patterns crucially impact soil microbial communities, and the ecosystem in Qinghai-Tibet Plateau(QTP) is highly vulnerable to climate change. However, we do not fully understand how soil microbial communities in the source wetlands of QTP respond to changes in precipitation. In this study, we employed advanced techniques such as high-throughput sequencing and metabolomics to investigate how soil microbial communities in a source wetland of Qinghai Lake respond to changes in precipitation after quadrennial precipitation *** Our findings showed that the predominant microbiota in the source wetland was Proteobacteria. Interestingly, alterations in precipitation levels, whether increased or reduced, did not significantly impact the diversity or functional groups of the microbial community. However, the structure of the microbial community did respond notably to changes in precipitation, leading to shifts in the relative abundance of Spirochaetes and Treponema. A notable finding was that reduced precipitation levels(– 25% and-50%) and mild increases in precipitation(25%) within the region contributed to increased soil carbon content. However, this effect ceased to manifest when precipitation increased by 50%. Additionally, the reduction in precipitation prompted the release of soil metabolites like syringic acid and aldosterone, while enhanced precipitation resulted in a decrease in aldosterone *** Precipitation changes altered the relative abundance of soil microbial communities and metabolites, which was conducive to increasing carbon storage in this alpine wetland.

关键词： Qinghai-Tibet Plateau Climate change Precipitation gradient Carbon and nitrogen cycles LC/MS

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Alpine grassland degradation intensifies the burrowing behavior of small mammals:evidence for a negative feedback loop

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Integrative Zoology 2024年第2期19卷 240-252页

作者： Zaiwei WANG Jiawen YAN Amy MARTIN Dianne HBRUNTON Jiapeng QU Jin-Sheng HE Weihong JI Zhibiao NAN State Key Laboratory of Herbage Improvement and grassland Agro-ecosystems College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhouChina Manaaki Whenua-Landcare Research LincolnNew Zealand School of Natural Sciences Massey University(Albany Campus)AucklandNew Zealand Key Laboratory of Adaptation and Evolution of Plateau Biota Northwest Institute of Plateau BiologyChinese Academy of SciencesXiningChina Qinghai Haibei national field Research station of Alpine grassland ecosystem Northwest Institute of Plateau BiologyChinese Academy of SciencesXiningChina Institute of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijingChina

Globally,grassland degradation is an acute ecological *** alpine grassland on the Tibetan Plateau,increased densities of various small mammals in degraded grassland are assumed to intensify the degradation process and these mammals are subject to lethal ***,whether the negative impact of small mammals is solely a result of population size or also a result of activity and behavior has not been *** this study,we use plateau pika as a model to compare population size,core area of colony,and the number of burrow entrances and latrines between lightly and severely degraded *** test whether the alleged contribution of pika to grassland degradation is a result of increased population size or increased burrowing activities of individuals in response to lower food *** found that grassland degradation resulted in lower plant species richness,plant height,and ***,the overall population size of pika was not significantly affected by location in lightly and severely degraded ***,pika core areas in severely grassland degradation were significantly larger and had significantly higher densities of burrows and *** study provides convincing evidence that habitat-induced changes in the behavior of small,burrowing mammals,such as pika,can exacerbate grassland *** finding has significant implications for managing small mammals and restoring degraded grassland ecosystems.

关键词： burrowing behavior grassland degradation plateau pika population size small mammals

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氮添加对内蒙古草原植物地上和地下碳氮磷化学计量学特征的影响

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Journal of Plant Ecology 2024年第1期17卷 57-67页

作者： Ziqi Wang Jie Wang Honghui Wu Tian Yang Yixin An Yunlong Zhang Jianlin Bian Ying Li Haiyan Ren Ariuntsetseg Lkhagva Xu Wang Qiang Yu School of grassland Science Beijing Forestry UniversityBeijing 100083China national Hulunber grassland ecosystem Observation and Research station Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081China Ministry of Agriculture Key Laboratory of Crop Nutrition and Fertilization Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081China Department of Biology University of Western OntarioLondonONCanada College of grassland Science and Technology China Agricultural UniversityBeijing 100083China College of Resource Environment and Tourism Capital Normal UniversityBeijing 100048China College of Agro-grassland Science Nanjing Agricultural UniversityNanjing 210095China Department of Biology School of Arts and SciencesNational University of MongoliaUlaanbaatar 14200Mongolia

氮沉降对生态系统功能和过程具有显著影响。已有研究表明氮添加会影响植物叶片C:N:P化学计量特征。然而,氮添加对植物根系C:N:P化学计量特征影响的研究罕有报道。本论文的主要目的是对比氮添加对草原植物群落地上和地下C:N:P化学计量特... 详细信息

氮沉降对生态系统功能和过程具有显著影响。已有研究表明氮添加会影响植物叶片C:N:P化学计量特征。然而,氮添加对植物根系C:N:P化学计量特征影响的研究罕有报道。本论文的主要目的是对比氮添加对草原植物群落地上和地下C:N:P化学计量特征的影响。我们在内蒙古锡林郭勒草原开展了一个7年的氮添加实验,该实验包括6个处理,分别是对照:control;N1:0.4 mol·m-2 N;N2:0.8 mol·m^(-2) N;N3:1.6 mol·m^(-2) N;N4:2.8 mol·m^(-2) N;N5:4 mol·m^(-2) N,每个处理6次重复。我们测量并分析了植物地上、地下生物量和C:N:P化学计量特征。研究结果表明,氮添加会导致植物群落地上部分碳浓度降低,氮浓度和磷浓度升高,C:N和C:P比值降低,N:P升高,而且地上碳、氮、磷库均因施氮而增加。然而,氮添加对0-10,10-30,30-50和50-100 cm 4个土层的地下部分碳、氮、磷浓度、比例、库和化学计量特征没有显著影响。综上所述,氮添加会显著改变植物群落地上部分C:N:P化学计量特征,进而影响草地生态系统的功能和过程,但对地下C:N:P化学计量特征几乎没有影响。

关键词：氮沉降 C:N:P 化学计量草地生态系统群落地下

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Short-term biochar effect on soil physicochemical and microbiological properties of a degraded alpine grassland

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Pedosphere 2022年第3期32卷 426-437页

作者： Jinsheng LI Xinqing SHAO Ding HUANG Kesi LIU Jianying SHANG Qian ZHANG Tianci ZHAO Xiaomeng YANG College of grassland Science and Technology China Agricultural UniversityBeijing 100193(China) national field station of grassland ecosystem at guyuan Hebei 076550(China) Department of Water and soil Science China Agricultural UniversityBeijing 100193(China)

Soil remediation is an important part of the restoration process of degraded terrestrial *** to its unique properties,biochar is being used widely as an effective soil modifier in agricultural systems,but research is still rare on biochar application in grassland ecosystems,especially in degraded alpine *** this study,we conducted a plot experiment to investigate the effect of biochar application on soil physicochemical properties and microorganisms at the 0–20 cm soil depth of a degraded alpine grassland in Qinghai-Tibet Plateau,*** experiment consisted of four corn straw biochar application levels(0%,0.5%,1%and 2%,with the percentage representing the ratio of biochar weight to the dry weight of soil in the surface 20 cm soil layer).When the biochar addition increased from 0%to 2%,total nitrogen,total organic carbon and available phosphorus in the 0–10 cm soil layer increased by 41%,55%and 45%,respectively,in the second year after biochar ***,soil electrical conductivity decreased,and soil water content *** microbial,fungal and bacterial biomasses in the 0–10 cm soil layer increased from 9.15 to 12.68,0.91 to 1.34,and 3.85 to 4.55μg g^(-1),*** relative biomasses of saprophytic fungi and methanotrophic bacteria decreased,while the relative biomasses of ectomycorrhizal fungi and arbuscular mycorrhizal fungi *** results indicate that biochar has a great potential in improving microbial activity and soil fertility in soil remediation of the degraded alpine grassland.

关键词： bacteria fungi microbial community phosphatase soil fertility soil modifier soil remediation urease

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Wind-proof and sand-fixing effects of Artemisia ordosica with different coverages in the Mu Us Sandy Land,northern China

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Journal of Arid Land 2022年第8期14卷 877-893页

作者： PANG Yingjun WU Bo JIA Xiaohong XIE Shengbo Institute of Desertification Studies Chinese Academy of ForestryBeijing 100091China Institute of Ecological Conservation and Restoration Chinese Academy of ForestryBeijing 100091China Key Laboratory of Desert ecosystem and Global Change National Forestry and Grassland AdministrationBeijing 100091China Kumtag Desert ecosystem Research station National Forestry and Grassland AdministrationDunhuang 736200China Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Wind erosion is a key global environmental problem and has many adverse *** Mu Us Sandy Land of northern China is characterized by an arid climate,where vegetation patches and bare sand patches are usually distributed mosaically,and aeolian activities occur *** plays a significant role in controlling wind *** ordosica is the most dominant native plant species in the Mu Us Sandy *** is urgent to study the wind-proof and sand-fixing effects of Artemisia ordosica in the Mu Us Sandy *** study analyzed the wind-proof and sand-fixing effects of Artemisia ordosica based on the field data of wind regimes,aeolian sediment transport,and surface change of Artemisia ordosica plots with four coverages(denoted as site A,site B,site C,and site D)in the Mu Us Sandy Land during the period from 1 June 2018 to 29 June *** coverages of Artemisia ordosica at site A,site B,site C,and site D were 2%,16%,29%,and 69%,*** annual average wind speeds at 2.0 m height above the ground for site A,site B,site C,and site D were 3.47,2.77,2.21,and 1.97 m/s,*** annual drift potentials were 193.80,69.72,15.05,and 6.73 VU at site A,site B,site C,and site D,*** total horizontal aeolian sediment fluxes during the period from 2-3 June 2018 to 6 June 2019 at site A,site B,site C,and site D were 4633.61,896.80,10.54,and 6.14 kg/m,*** A had the largest surface changes,and the surface changes at site B were significantly weaker than those at site A,whereas the surface changes at site C and site D were *** results indicated that Artemisia ordosica significantly reduced the wind speed,drift potential,aeolian sediment transport,and surface *** higher the coverage of Artemisia ordosica is,the more obvious the effects of wind-proof and *** erosion would be effectively controlled in the Mu Us Sandy Land if the coverage of Artemisia ordosica is greater than 29%.These results provid

关键词： Artemisia ordosica wind-proof sand-fixing wind erosion aeolian sediment flux Mu Us Sandy Land

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Whole-soil warming shifts species composition without affecting diversity,biomass and productivity of the plant community in an alpine meadow

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Fundamental Research 2023年第2期3卷 160-169页

作者： Wenkuan Qin Ying Chen Xudong Wang Hongyang Zhao Yanhui Hou Qiufang Zhang Xiaowei Guo Zhenhua Zhang Biao Zhu Institute of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing 100871China Qinghai Haibei national field Research station of Alpine grassland ecosystem and Key Laboratory of Adaptation and Evolution of Plateau BiotaNorthwest Institute of Plateau BiologyChinese Academy of SciencesXining 810001China

The structure and function of plant communities in alpine meadow ecosystems are potentially susceptible to climate ***,we utilized a unique field manipulation experiment in an alpine meadow on the Qinghai-Tibetan Plateau and investigated the responses of plant species diversity,composition,biomass,and net primary productivity(NPP)at both community and functional group levels to whole-soil-profile warming(3–4℃ across 0–100 cm)during 2018–*** species diversity,biomass and NPP(both above-and belowground)at the community level showed remarkable resistance to ***,plant community composition gradually shifted over *** the whole experimental warming period,aboveground biomass of legumes significantly decreased by 45%.Conversely,warming significantly stimulated aboveground biomass of forbs by 84%,likely because of better growth and competitive advantages from the warming-induced stimulation of soil water and other ***,warming showed minor effects on aboveground biomass of grasses and ***,we emphasize that experimental warming may significantly affect plant community composition in a short term by triggering adjustments in plant interspecific competition or survival strategies,which may cause potential changes in plant productivity over a more extended period and lead to changes in carbon source-sink dynamics in the alpine meadow ecosystem.

关键词： Whole-soil-profile warming Compensatory interactions Legumes Forbs Qinghai-Tibetan Plateau

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Plateau pikas near roads are bold and silent when facing a potential predator

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Current Zoology 2023年第5期69卷 552-558页

作者： Bicheng Zhua Jiapeng Qu Jianguo Cui CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengdu 610041SichuanChina Key Laboratory of Adaptation and Evolution of Plateau Biota Northwest Institute of Plateau BiologyChinese Academy of SciencesQinghai 810008China Qinghai Haibei national field Research station of Alpine grassland ecosystem Qinghai 810008China

Human disturbance,particularly road traffic,is one of the greatest threats to *** the association between alerting behavior and the survival of animals,it is important to study the effects of road traffic on alerting behavior of *** studies assessing the shortterm impact of road traffic on alerting behavior of wildlife have focused on vigilance ***,studies on the use of alarm calls are scarce,and it is unclear whether such behavioral responses change after repeated exposure to road *** assessed the alerting behavior of plateau pikas(Ochotona curzoniae)who were near or far from roads when facing a potential *** found that pikas near roads exhibited shorter vigilance and tolerance distances,and produced fewer alarm calls than those relatively far away from ***,both vigilance and tolerance distances of plateau pikas were significantly positively correlated with the distance from the burrow to the *** traffic reduced antipredator responses and shaped alerting behavior;that is,pikas near roads were bolder and more silent compared to those far away from *** findings suggest that increasing urbanization will have corresponding effects on animal behavior,which may have significant fitness effects in the future.

关键词： alarm call flight initiation distance plateau pika Qinghai-Tibet Plateau road traffic vigilant behavior

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Synergies between microsites of plant communities and steady-stage alpine meadows on the Qinghai-Tibetan Plateau

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grassland Research 2023年第4期2卷 289-298页

作者： Li Lin Xingliang Xu Guangmin Cao Fawei Zhang Yikang Li Bo Fan Qian Li Junjie Huang Qinghai Haibei national field Research station of Alpine grassland ecosystem and Key Laboratory of Adaptation and Evolution of Plateau Biota Northwest Institute of Plateau BiologyChinese Academy of SciencesXiningChina Key Laboratory of ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina School of Mechanical and Power Engineering Henan Polytechnic UniversityJiaozuoChina

Background:Due to the effects of climate change and overgrazing in recent decades,alternative stable states in the alpine Kobresia meadow degradation process have coexisted in the same geographical and climatic environment,with variations occurring among ***:We used a space-for-time substitution approach to explore the synergies of microsite variation according to its numerical characteristics and the proportion of each stable state at various stages of succession in alpine Kobresia meadows on the Qinghai-Tibetan ***:(1)The highest average aboveground biomass in summer was 196.2±20.3 gm^(-2),with significantly higher levels of biomass in≤3.65 sheep unit ha^(-1) than in other levels of grazing intensity,while the parameters showed no significant differences among grazing intensity levels in>3.65 sheep unit ha^(-1).(2)The importance of plant functional groups,aboveground biomass,and niche breadth of Poaceae and Cyperaceae significantly decreased as the grazing intensity increased.(3)The effects of≥0°C accumulated temperature,total precipitation,altitude,longitude,and latitude cumulatively contributed less than 20%of the variation in the distribution of functional group characteristics across ***:(1)Overgrazing decreases primary production in alpine Kobresia meadows,but ecosystem responses regulate plant community structure and botanical components so as to partially counteract grazing disturbance.(2)Overgrazing changed the proportion of microsites,which in turn led to regime shift in the plant community and subsequent synergies between the microsites of plant communities and their stable states.

关键词： alpine ecosystem degradation alternative stable state microsite overgrazing succession

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Effects of long-term grazing exclusion on vegetation structure,soil water holding capacity,carbon and nitrogen sequestration capacity in an alpine meadow on the Tibetan Plateau

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Journal of Mountain Science 2023年第3期20卷 779-791页

作者： YANG Yong-sheng ZHANG Fa-wei XIE Xian-rong WANG Jun-bang LI Ying-nian HUANG Xiao-tao LI Hui-ting ZHOU Hua-kun Key Laboratory of Adaptation and Evolution of Plateau Biota and Key Laboratory of Restoration Ecology in Cold Region of Qinghai Province Northwest Institute of Plateau BiologyChinese Academy of SciencesXining 810008China Qinghai Haibei national field Research station of Alpine grassland ecosystem Xining 810008China Xi Ning Municipal Beishan Forestry Farm Xining 810003China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China

Grazing exclusion is one of the primary management practices used to restore degraded grasslands on the Tibetan ***,to date,the effects of long-term grazing exclusion measures on the process of restoring degraded alpine meadows have not been *** this study,moderately degraded plots,in which the vegetation coverage was approximately 65%and the dominant plant species was Potentilla anserina L,with grazing exclusion for 2 to 23 years,were selected in alpine meadows of Haibei in Qinghai-Tibet *** coverage,plant height,biomass,soil bulk density,saturated water content,soil organic carbon(SOC)and total nitrogen(TN)were *** results were as follows:(1)With aboveground biomass and total saturated water content at 0-40 cm depth,the average SOC and TN contents in moderately degraded alpine meadows increased as a power function,and the plant height increased as a log function.(2)The average soil bulk density at 0-40 cm depth first decreased and then increased with increasing grazing exclusion duration,and the minimum value of 0.90 g·cm^(-3) was reached at 15.23 *** plant coverage,total belowground biomass at 0-40 cm depth,total aboveground and belowground biomass first increased and then decreased,their maximum values(80.49%,2452.92g·m^(-2),2891.06 g·m^(-2))were reached at 9.41,9.46 and 10.25 years,***-term grazing exclusion is apparently harmful for the sustainable restoration of degraded alpine *** optimal duration of grazing exclusion for the restoration of moderately degraded alpine meadows was 10 *** research suggests that moderate disturbance should be allowed in moderately degraded alpine meadows after 10years of grazing exclusion.

关键词： Long-term grazing exclusion Soil water holdingcapacity Soilcarbonand nitrogen sequestration Biomass Alpine meadow

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大规模人工造林是否会加剧中国北方土壤水分亏缺?

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Science Bulletin 2024年第10期69卷 1506-1514页

作者：王秋铭刘鸿雁梁博毅石亮伍露曹静 College of Urban and Environmental Sciences and PKU Saihanba StationPeking UniversityBeijing 100871China College of Forestry Precision Forestry Key Laboratory of BejingBejing Forestry UniversityBeijing 10083China Key Laboratory of ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China China Meteorological Administration Training Center Beijing 100081China State Key Laboratory of Environmental Criteria and Risk Assessment State Environmental Protection Key Laboratory of Regional Eco-process and Function AssessmentChinese Research Academy of Environmental SciencesBeijing 100012China

Trading water for carbon has cautioned large-scale afforestation in global ***,model simulations suggested that the consumption of soil water could be partially offset by increasing precipitation due to vegetation feedback.A systematic meta-analysis of long-term and large-scale field observations is urgently required to address the abovementioned limitations,and the implementation of large-scale afforestation since 1978 in northern China provides an ideal *** study collected data comprising 1226 observations from 98 sites in northern China to assess the variation in soil water content(SWC)with stand age after afforestation and discuss the effects of tree species,precipitation and conversions of land use types on *** found that the SWC has been decreased by coniferous forest and broadleaf forest at rates of 0.6 and 3.2 mm decade-1,respectively,since *** is a significant declining trend of SWC with the stand age of plantations,and the optimum growth stage for plantation forest is 0-20 a in northern ***,we found increases in SWC for the conversion from grassland to forest and in the low-precipitation region,both are corresponding to the increased SWC in coniferous *** study implies that afforestation might lead to a soil water deficit crisis in northern China in the long term at the regional scale but depends on prior land use types,tree taxa and the mean annual precipitation regime,which sheds light on decision-making regarding ecological restoration policies and water resource management in drylands.

关键词： Soil water Afforestation Tree planting Land use changes Arid and semiarid area

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