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Heterogeneity in supraglacial debris thickness and its role in glacier mass changes of the mount gongga

Science China Earth Sciences 2016年第1期59卷 170-184页

作者： ZHANG Yong HIRABAYASHI Yukiko FUJITA Koji LIU Shi Yin LIU Qiao State Key Laboratory of Cryospheric Sciences Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences Institute of Engineering Innovation The University of Tokyo Graduate School of Environmental Studies Nagoya University Institute of mountain Hazards and Environment Chinese Academy of Sciences

In the Tibetan Plateau, many glaciers have extensive covers of supraglacial debris in their ablation zones, which affects glacier response to climate change by altering ice melting and spatial patterns of mass loss. Insufficient debris thickness data make it difficult to analyze regional debris-cover effects. Maritime glaciers of the mount gongga have been characterized by a substantial reduction in glacier area and ice mass in recent decades. The thermal property of the debris layer estimated from remotely sensed data reveals that debris-covered glaciers are dominant in this region, on which the proportion of debris cover to total glacier area varies from 1.74% to 53.0%. Using a physically-based debris-cover effect assessment model, we found that although the presence of supraglacial debris has a significant insulating effect on heavily debris-covered glaciers, il accelerates ice melting on -10.2% of total ablation zone and produces rapid wastage of -25% of the debris-covered glaciers, leading to the similar mass losses between the debris-covered and debris-free glaciers. Widespread debris cover also facilitates the development of active terminus regions. Regional differences in debris-cover effects are apparent, highlighting the im- portance of debris cover for understanding glacier mass changes in the Tibetan Plateau and other mountain ranges around the world.

关键词： Debris-cover effect Ice melting Maritime glacier Glacier status mount gongga

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Community assemblage of free-living diazotrophs along the elevational gradient of mount gongga

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Soil Ecology Letters 2019年第3期1卷 136-146页

作者： Yansu Wang Chaonan Li Zehao Shen Junpeng Rui Decai Jin Jiabao Li Xiangzhen Li Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province and School of Life Sciences Jiangsu Normal UniversityXuzhou 221116China Key Laboratory of Environmental and Applied Microbiology CAS/Environmental Microbiology Key Laboratory of Sichuan ProvinceChengdu Institute of BiologyChinese Academy of SciencesChengdu 610041China Department of Ecology Ministry of Education Key Laboratory for Earth Surface ProcessesPeking UniversityBeijing 100871China Key Laboratory of Environmental Biotechnology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

mountain systems are unique for studying the responses of species distribution and diversity to environmental changes along elevational *** is well known that free-living diazotrophic microorganisms are important to nitrogen cycling in mountain ***,the elevational patterns of free-living diazotrophs and the underlying ecological processes in controlling their turnover along broader gradients are less well ***,we investigated the pattern of diazotrophic diversity along the elevational gradient(1800 m-4100 m)in mount gongga of *** results showed that the α-diversity of diazotrophs did not change with the elevation from 1800 m to 2800 m,but decreased at elevations above 3000 *** diversity pattern was driven mainly by soil total carbon,nitrogen,and plant *** diazotrophic taxa showed differential abundance-elevation *** processes determining diazotrophic community assemblage shift along the *** processes were relatively stronger at both low and high elevations,whereas stochastic processes were stronger at the middle *** study also suggested a strong relationship among aboveground plants and diazotrophs,highlighting their potential interactions,even for free-living diazotrophs.

关键词： Diazotrophs Community assemblage Elevational gradient mount gongga

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