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How cushion communities are maintained in alpine ecosystems： A review and case study on alpine cushion plant reproduction

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plant Diversity 2017年第4期39卷 221-228页

作者： Jianguo Chen Yanbo Li Yang Yang Hang Sun Key Laboratory for plant Diversity and Biogeography of East Asia Kunming Institute of Botany Chinese Academy of Sciences Kunming Yunnan China University of Chinese Academy of Sciences Beijing 100049 China

cushion species occur in nearly all alpine environments worldwide. In past decades, the adaptive and ecosystem-engineering roles of such highly specialized life forms have been well studied. However, the adaptive strategies responsible for cushion species reproductive success and maintenance in severe alpine habitats remain largely unclear. In this study, we reviewed the current understanding of reproductive strategies and population persistence in alpine cushion species. We then present a preliminary case study on the sexual reproduction of Arenaria polytrichoides(Caryophyllaceae), a typical cushion species inhabiting high elevations of the Himalaya Hengduan Mountains, which is a hotspot for diversification of cushion species. Finally, we highlight the limitations of our current understanding of alpine cushion species reproduction and propose future directions for study.

关键词： Alpine ecosystem cushion plant Community recruitment Growth rate Life-span Reproduction

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The Facilitation of Restoration by cushion plant Androsace tapete in a Degraded Alpine Grassland

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Journal of Resources and Ecology 2022年第1期13卷 107-112页

作者： HE Yongtao WANG Fang NIU Ben WANG Zhipeng LI Meng SHI Peili ZHANG Xianzhou Lhasa Plateau Ecosystem Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences andNatural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China

The cushion plant Androsace tapete is an endemic species that is widely distributed in the Qinghai-Tibetan Plateau, and also predominant in the alpine grassland that is locally degraded due to overgrazing and other reasons. As an ecosystem engineer cushion plant, its ability to facilitate the restoration of degraded alpine grassland was studied in a degraded alpine grassland at an elevation of 4500 m on the southern slope of the Nyainqentanglha Mountains in Damxung. The species diversity, soil nutrients and water content underneath and outside the cushion plant A. tapete were investigated. The results showed that soil nutrients underneath the A. tapete cushion were significantly increased by about 16%-48% compared to outside the cushion, of which the organic matter and total N were increased by 16.2% and 18.9% respectively, and the soil water content was increased about 12%. The index of species diversity of richness(S), Shannon-Wiener’s H and Simpson’s D all increased with the coverage of cushion plant A. tapete. Our results suggested that this cushion plant can facilitate restoration of the degraded alpine grassland by modifying the local soil environment and increasing the community diversity, so it should be conserved for the restoration of degraded alpine grasslands on the Qinghai-Tibetan Plateau.

关键词： cushion plant facilitation degraded alpine meadow species diversity soil nutrients

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Seasonal comparison of bacterial communities in rhizosphere of alpine cushion plants in the Himalayan Hengduan Mountains

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plant Diversity 2018年第5期40卷 209-216页

作者： Shuai Chang Jianguo Chen Jianqiang Su Yang Yang Hang Sun Key Laboratory for plant Diversity and Biogeography of East Asia Kunming Institute of Botany Chinese Academy of Sciences Kunming 650201 China University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China

Positive associations between alpine cushion plants and other species have been extensively ***,almost all studies have focused on the associations between *** that have investigated positive associations between alpine cushion plants and rhizospheric microbes have been limited to the vegetation growing ***,we asked whether the positive effects that alpine cushion plants confer on rhizospheric microbe communities vary with *** assessed seasonal variations in the bacterial diversity and composition in rhizosphere of two alpine cushion plants and surrounding bare ground by employing a high throughput sequencing method targeting the V3 region of bacterial 16 S rRNA *** properties of the rhizosphere and the bare ground were also *** found that cushion rhizospheres harbored significantly more C,N,S,ammonia nitrogen,and soil moisture than the bare *** properties in cushion rhizospheres were not notably different,except for soil *** diversities within the same microhabitats did not vary significantly with *** concluded that alpine cushion plants had positive effects on the rhizospheric bacterial communities,even though the strength of the effect varied in different cushion *** species and the soil sulfur content were probably the major factors driving the spatial distribution and structure of soil bacterial communities in the alpine communities dominated by cushion plants.

关键词： Alpine cushion plant Positive effect Rhizosphere Bacteria Soil nutrient

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Allelopathic potentials of surrounding vegetation on seedling establishment of alpine cushion Arenaria polytrichoides Edgew

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Journal of plant Ecology 2024年第2期17卷 146-160页

作者： Xu-Fang Chen Li-Shen Qian Hong-Hua Shi Ya-Zhou Zhang Min-Shu Song Hang Sun Jian-Guo Chen Key Laboratory for plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanChina University of Chinese Academy of Sciences Beijing 101408China

When facilitating other species and sustaining plant community structures and biodiversity,alpine cushion plants simultaneously experience negative feedback effects from surrounding ***,the impact of surrounding vegetation on cushion dynamics remains poorly understood,particularly in terms of allelopathic *** investigate the allelopathic potentials of surrounding vegetation on seedling establishment of the typical cushion plant Arenaria polytrichoides *** an elevational gradient,we extracted potential allelopathic compounds and tested their impacts on seed germination and seedling growth of *** addition,exclusion experiments using activated carbon were conducted to further elucidate these *** results demonstrate that surrounding vegetation exhibits certain allelopathic potentials on *** seedling establishment,with variations observed based on elevation,source and concentration of allelopathy compounds,as well as growing ***,low-elevation vegetation exerts pronounced suppression on seedling ***,higher-elevation vegetation generally shows no effect on seed germination but stimulates seedling growth through allelopathy ***,aboveground vegetation predominantly inhibits both seed germination and seedling growth in low-elevation communities;however,the effects of belowground vegetation depend on elevation and extract concentration *** identifed allelopathic potentials of surrounding vegetation signifcantly infuence the population dynamics of cushion *** by potentially accelerating population degeneration in lower-elevation communities while ensuring consistent population recruitment and expansion in higher-elevation communities.

关键词： allelopathic potential community dynamic cushion plant seed germination seedling growth

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