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Above-and belowground trait linkages of dominant species shape responses of alpine steppe composition to precipitation changes in the Tibetan Plateau

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Journal of Plant Ecology 2021年第4期14卷 569-579页

作者： Zhi Zheng Yue Zhang Shihu Zhang Qun Ma Dajie Gong Guoying Zhou College of Life Science Northwest Normal UniversityLanzhou 730070China Key Laboratory of Tibetan Medicine Research Northwest Institute of Plateau BiologyChinese Academy of ScienceXining 810008China

Aims Human activities and global changes have led to alterations in global and regional precipitation *** extensive studies on the effects of changes in precipitation regimes on plant community composition across different types of grassland worldwide,few studies have specifically focused on the effects of precipitation changes on high-altitude alpine steppe at community and plant species levels in the Tibetan *** We investigated the effects of growing-season precipitation changes(reduced precipitation by 50%,ambient precipitation,enhanced precipitation by 50%)for 6 years on plant community composition in an alpine steppe of the Tibetan Plateau by linking above-to belowground traits of dominant *** Findings We found that reduced precipitation shifted community composition from dominance by bunchgrass(primarily Stipa purpurea)to dominance by rhizomatous grass(primarily Leymus secalinus).Roots and leaf traits of *** and *** differed in their responses to reduced *** precipitation enhanced root vertical length and carbon(C)allocation to deep soil layers,and decreased the leaf width in ***,but it did not change the traits in ***,reduced precipitation significantly enhanced rhizome biomass,length,diameter and adventitious root at the rhizome nodes in *** changes in traits may render rhizomatous grass greater competitive during drought ***,our findings highlight important roles of above-and belowground traits of dominant species in plant community composition of alpine steppe under precipitation change.

关键词： precipitation change functional group dominant species Stipa purpurea Leymus secalinus soil moisture plant traits alpine steppe Tibetan Plateau

Plant diversity-productivity patterns in the alpine steppe environment of the Central Tianshan Mountains

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Journal of Arid Land 2009年第1期1卷 43-48页

作者： Hu, YuKun Li, KaiHui Gong, YanMing Yin, Wei Chinese Acad Sci Xinjiang Inst Ecol & Geog Urumqi 830011 Peoples R China Chinese Acad Sci Grad Univ Beijing 100039 Peoples R China

The biodiversity-productivity relationship is an important topic in the research of biodiversity and ecosystem function. The plant diversity productivity pattern is commonly unimodal and positively correlated. This paper researches the characteristics of plant diversity-productivity patterns in the Bayanbuluk alpine steppe in the central Tianshan Mountains, Xinjiang, China, and analyzes the effects of environmental factors on the distribution of plant communities, species composition, plant diversity and productivity in the steppe. The results show a positive correlation between plant diversity and productivity. DCCA (detrended canonical correspondence analysis) ordination reveals a significant relationship between the effects of air temperature, soil moisture content, available soil nitrogen, relative humidity and pH value on the distribution and composition of plant communities. There are significant correlations between the soil moisture content, relative humidity, pH value, air temperature and species richness and the aboveground biomass of Gramineae and Cyperaceae, and also significant correlations between the relative humidity, pH values and the total aboveground biomass of plant communities.

关键词： Tianshan Mountains plant diversity productivity DCCA ordination alpine steppe environmental factor

Profile of Methane Concentrations in Soil and Atmosphere in alpine steppe Ecosystem on Tibetan Plateau

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Chinese Journal of Population,Resources and Environment 2009年第1期7卷 3-10页

作者： Pei Zhiyong Ouyang Hua Zhou Caiping Xu Xingliang The Administrative Center for China＇s Agenda 21 Beijing 100038 China Interntional Center for Integrated Mountain Development Kathmanda Nepal Institute of Geographical Sciences and Natural Resources Research CAS Beijing 100101 China

The methane concentration profile from -1.5m depth in soil to 32m height in air was measured in alpine steppe lo-cated in the permafrost area. Methane concentrations showed widely variations both in air and in soil during the study period. The mean concentrations in atmosphere were all higher than those in soil, and the highest methane concentration was found in air at the height of 16m with the lowest concentration occur-ring at the depth of 1.5m in soil. The variations of atmospheric methane concentrations did not show any clear pattern both temporally and spatially, although they exhibited a more steady-stable state than those in soil. During the seasonal variations, the methane concentrations at different depths in soil were sig-nificantly correlated (R2>0.6) with each other comparing to the weak correlations (R2<0.2) between the atmospheric concentra-tions at different heights. Mean methane concentrations in soil significantly decreased with depth. This was the compositive influence of the decreasing production rates and the increasing methane oxidation rates, which was caused by the descent soil moisture with depth. Although the methane concentrations at all depths varied widely during the growing season, they showed very distinct temporal variations in the non-growing season. It was indicated from the literatures that methane oxidation rates were positively correlated with soil temperature. The higher methane concentrations in soil during the winter were deter-mined by the lower methane oxidation rates with decreasing soil temperatures, whereas methane production rates had no reaction to the lower temperature. Relations between methane contribution and other environmental factors were not discussed in this paper for lacking of data, which impulse us to carry out further and more detailed studies in this unique area.

关键词： methane concentration profile temperature moisture alpine steppe Tibetan Plateau

Stipa steppes in scantily explored regions of the tibetan Plateau:classification,community characteristics and climatic distribution patterns

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Journal of Plant Ecology 2018年第4期11卷 585-594页

作者： Haiwei Zhao Ke Guo Yao Yang Changcheng Liu Liqing Zhao Xianguo Qiao Dongjie Hou Chenguang Gao State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesNo.20 NanxincunXiangshanBeijing 100093China College of Life Sciences University of Chinese Academy of SciencesNo.19A Yuquan RoadBeijing 100049China School of Life Sciences Inner Mongolia UniversityNo.235 Daxuexi RoadHohhotInner Mongolia 010021China

Aims As a unique geographical unit of the earth,the tibetan Plateau is extensively covered by various Stipa ***,their vegetation features have not been reported systematically till now,especially in some scantily explored *** this study,we endeavor to reveal the community types,quantitative charac-teristics and climatic distribution patterns of Stipa steppes in these areas based on primary relevés obtained from *** We collected a total of 223 plots in 79 study sites in the Changthang Plateau and the Yarlung Zangbo Valley,ranging from 79°E to 91°*** categories of Stipa formations were identified according to the classification scheme in Vegetation of China and then verified by Nonmetric Multidimensional *** performed detrended correspondence analysis and detrended canonical correspondence analysis to hunt for the alteration of Stipa communities along the precipitation *** characteristics including species richness,coverage,biomass as well as importance values(IV)of dominant species were calcu-lated and visualized,*** Findings Stipa steppes in scantily explored regions of the tibetan Plateau are classified into 11 formations but major formations are rather limited in ***(form.)Stipa purpurea is the most widespread Stipa assemblages not only in scantily explored regions but also across the whole tibetan *** characteristics of Stipa com-munities,including coverage,species richness,productivity and IV of dominant species,demonstrate the features of typical alpine steppes on the tibetan *** proves to be the prime climatic factor controlling the distribution patterns of Stipa *** subsessiliflora *** and *** glareosa normally distribute in arid habitats,but rainfall for the former is of greater *** roborowskyi and *** capillacea favor moderately moist *** purpurea and ***

关键词： stipa steppe community characteristic distribution pattern alpine steppe the tibetan Plateau

Effects of Enclosure on Plant and Soil Nutrients in Different Types of alpine Grassland

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Journal of Resources and Ecology 2020年第3期11卷 290-297页

作者： WANG Fang HE Yongtao FU Gang NIU Ben ZHANG Haorui LI Meng WANG Zhipeng WANG Xiangtao ZHANG Xianzhou Lhasa Plateau Ecosystem Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China

Enclosure is one of the most widely used management tools for degraded alpine grassland on the northern Tibetan Plateau, but the responses of different types of grassland to enclosure may vary, and research on these responses can provide a scientific basis for improving ecological conservation. This study took one site for each of three grassland types(alpine meadow, alpine steppe and alpine desert) on the northern Tibetan Plateau as examples, and explored the effects of enclosure on plant and soil nutrients by comparing differences in plant community biomass, leaf-soil nutrient content and their stoichiometry between samples from inside and outside the fence. The results showed that enclosure can significantly increase all aboveground biomass in these three grassland types, but it only increased the 10–20 cm underground biomass in the alpine desert. Enclosure also significantly increased the leaf nutrient content of the dominant plants and contents of total nitrogen(N), total potassium(K), and organic carbon(C) in 10–20 cm soil in alpine desert, thus changing the stoichiometry between C, N and P(phosphorus). However, enclosure significantly increased only the N content of dominant plant leaves in alpine steppe, while other nutrients and stoichiometries of both plant leaves and soil did not show significant differences in alpine meadow and alpine steppe. These results suggested that enclosure has differential effects on these three types of alpine grasslands on the northern Tibetan Plateau, and the alpine desert showed the most active ecological conservation in the responses of its soil and plant nutrients.

关键词： enclosure alpine meadow alpine steppe alpine desert steppe plant nutrient soil nutrient