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Warming increases soil carbon input in a Sibiraea angustata-dominated alpine shrub ecosystem

Journal of Plant Ecology 2022年第2期15卷 335-346页

作者： Mei Liu Jia-Hao Wen Ya-Mei Chen Wen-Juan Xu Qiong Wang Zhi-Liang Ma Ecological Security and Protection Key Laboratory of Sichuan Province Mianyang Normal UniversityMianyang 621000China Department of Watershed Sciences and the Ecology Center Utah State UniversityLoganUT 84321USA College of Life Sciences China West Normal UniversityNanchong 637009China

Plant-derived carbon(C)inputs via foliar litter,root litter and root exudates are key drivers of soil organic C ***,the responses of these three input pathways to climate warming have rarely been studied in alpine *** employing a 3-year warming experiment(increased by 1.3℃),we investigated the effects of warming on the relative C contributions from foliar litter,root litter and root exudates from Sibiraea angustata,a dominant shrub species in an alpine shrubland on the eastern Qinghai-Tibetan *** soil organic C inputs from foliar litter,root litter and root exudates were 77.45,90.58 and 26.94 g C m^(-2),*** only slightly increased the soil organic C inputs from foliar litter and root litter by 8.04 and 11.13 g C m^(-2),but significantly increased the root exudate C input by 15.40 g C m^(-2).Warming significantly increased the relative C contributions of root exudates to total C inputs by 4.6%but slightly decreased those of foliar litter and root litter by 2.5%and 2.1%,*** results highlight that climate warming may stimulate plant-derived C inputs into soils mainly through root exudates rather than litter in alpine shrublands on the Qinghai-Tibetan Plateau.

关键词： soil organic carbon foliar litter root litter root exudates climate warming alpine shrub Qinghai-Tibetan Plateau

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Distribution and Estimation of Aboveground Biomass of alpine shrubs along an Altitudinal Gradient in a Small Watershed of the Qilian Mountains, China

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Journal of Mountain Science 2015年第4期12卷 961-971页

作者： LIU Zhang-wen CHEN Ren-sheng SONG Yao-xuan HAN Chun-tan Qilian alpine Ecology & Hydrology Research Station Key Laboratory of Ecohydrology of Inland Basin Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences University of Chinese Academy of Sciences

shrublands serve as an important component of terrestrial ecosystems, and play an important role in structure and functions of alpine *** estimation of biomass is critical to examination of the productivity of alpine ecosystems, due to shrubification under climate change in past *** this study, 14 experimental plots and 42 quadrates of the shrubs Potentilla fruticosa and Caragana jubata were selected along altitudes gradients from 3220 to 3650 m a.s.l.(above sea level) on semi-sunny and semi-shady slope in Hulu watershed of Qilian Mountains, *** foliage, woody component and total aboveground biomass per quadrate were examined using a selective destructive method, then the biomass were estimated via allometric equations based on measured parameters for two shrub *** results showed that *** accounted for 1–3 times more biomass(480.98 g/m2) than ***(191.21 g/m2).The aboveground biomass of both the shrubs varied significantly with altitudinal gradient(P<0.05).Woody component accounted for the larger proportion than foliage component in the total aboveground *** biomass on semi-sunnyslopes(200.27 g/m2 and 509.07 g/m2) was greater than on semi-shady slopes(182.14 g/m2 and 452.89g/m2) at the same altitude band for *** and *** contrast, the foliage biomass on semi-shady slopes(30.50 g/m2) was greater than on semi-sunny slopes(27.51 g/m2) for two *** deceased with increasing altitude for ***, whereas *** showed a hump-shaped pattern with *** equations were obtained from the easily descriptive parameters of height(H), basal diameter(D) and crown area(C) for biomass of *** and *** the equations type and variables comprising of the best model varied among the species, all equations related to biomass were significant(P < 0.005), with determination coefficients(R2) ranging from 0.81 to *** allometric equations satisfied the requirements of t

关键词： Aboveground biomass Allometric equations alpine shrub Altitudinal gradient Qilian Mountains

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Nesting records of 20 bird species in Lhasa region,Tibet

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Chinese Birds 2010年第3期01卷 167-174页

作者：卢欣柯坫华马小艳贡国鸿于同雷武汉大学生命科学学院

This paper provides the information on nesting biology of 20 bird species in alpine shrub (4000-4700 m a.s.l.) or alpine meadow-wasteland habitats (4300-4700 m a.s.l.) in Lhasa region,*** these species,three are endemic to the Tibetan plateau and 17 widespread in *** data on these taxa are all new to the high-altitude environments,especially the upper limit of their breeding distribution.A few species are firstly reported with respect to nesting information in the *** study will contribute our knowledge for natural history of birds occurring in the harsh,extreme habitats.

关键词： alpine shrub alpine meadow-wasteland breeding parameter Tibetan plateau

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