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The Facilitation of Restoration by Cushion Plant Androsace tapete in a Degraded Alpine Grassland

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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Crop residue-derived dissolved organic matter accelerates the decomposition of native soil organic carbon in a temperate agricultural ecosystem

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Acta Ecologica Sinica 2019年第1期39卷 69-76页

作者： Qiu, Qingyan Wu, Lanfang Li, Binbin Forest Ecology Stable Isotope Center College of Forestry Fujian Agriculture and Forestry University Fuzhou 350002 China Yucheng Comprehensive Experiment Station Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China 11A Datun Road Chaoyang District Beijing 100101 China

Crop residue-derived dissolved organic matter (DOM) plays an important role in soil carbon (C) cycling. To investigate the effects of maize residue-derived DOM and urea additions on the native soil organic carbon (SOC) decomposition and soil net C balance a pot experiment was carried out during the winter wheat growing season in the North China Plain (NCP). The results showed that adding maize residue-derived DOM alone (RDOM) or together with urea (RDOM + N) accelerated the decomposition of native SOC and resulted in a net SOC loss. The net loss of SOC was 3.90 ± 0.61 and 3.53 ± 0.48 g C m⁻² in RDOM and RDOM + N treatments, respectively. The stimulatory effect of per unit DOM-C addition on the native SOC decomposition was 0.25 ± 0.05 and 0.45 ± 0.07 for the RDOM and RDOM + N treatments, respectively. Increases in the microbial biomass and the activity of β-glucosidase, invertase and cellobiohydrolase as well as soil mineral N content were responsible for a more intense priming effect in DOM-amended soils. The positive relationship between primed soil C and soil available N (R = 0.76, P b 0.05) suggested that the stimulation of decomposition of native SOC by DOM addition would be enhanced by nitrogen fertilizer application. © 2018 Ecological Society of China. Published by Elsevier B.V. All rights reserved.

关键词： Carbon sequestration Dissolved organic matter Enzyme activity Priming effect Soil N availability

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Geographical features and development models of estuarine cities

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Journal of Geographical Sciences 2024年第1期34卷 25-40页

作者： CHEN Mingxing XIAN Yue HUANG Yaohuan SUN Zhigang WU Chengbin Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China College of Resource and Environment University of Chinese Academy of SciencesBejing 100049China State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China Zhongke Shandong Dongying Institute of Geography Dongying 257509ShandongChina CAs Engineering Laboratory for Yellow River Delta Modern Agriculture Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China

Cities are the key areas for human beings to achieve sustainable development goals in the *** cities are a special type of coastal city in urgent need of a clear *** paper proposed that estuarine cities are cities developed on the coast where rivers and oceans meet and defined four connotations,including the intersection of rivers and marine water systems,the coordinated development of land and oceans,the location advantages of connecting rivers and seas,and the important fragility of the ecological *** used Hydro SHEDS,OSM,GPW,and urban socioeconomic statistics and selected 50 estuarine cities with large rivers as representatives to summarize the main geographical basis and socioeconomic *** are primarily found in low-altitude,flat regions with average annual temperatures that mainly vary from 10℃to 25℃,relatively abundant precipitation,and extensive biological *** are substantial variations in the socioeconomic features of estuarine *** proposed eight development patterns,including open and inclusive city spirit,high-quality livable cities,high-quality development driven by innovation,integration of internal and external communication with ports and cities,construction of an international financial center,ecological environment protection and restoration,active promotion of cultural tourism,and positive international exchanges.

关键词： estuarine cities great rivers development models sustainability physical geography socioeconomy

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Evaluating calibration strategies for isotope ratio infrared spectroscopy for atmospheric 13CO2/12CO2 measurement

Evaluating calibration strategies for isotope ratio infrared...

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第二届全国稳定同位素新技术开发与应用交流研讨会

作者： X.-F.Wen Y.Meng X.-Y.Zhang X.-M.Sun X.Lee Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Na Yale-NUIST Center on Atmospheric Environment Nanjing University of Information Science & Technology

Isotope ratio infrared spectroscopy (IRIS) provides an in situ technique for measuring δ13C in atmospheric CO2.A number of methods have been proposed for calibrating the IRIS measurements, but few studies have systematically evaluated their accuracy for atmospheric *** this study, we carried out laboratory and ambient measurements with two commercial IRIS analyzers and compared the accuracy of four calibration *** found that calibration based on the 12C and 13C mixing ratios (Bowling et al., 2003) and on linear interpolation of the measured delta using the mixing ratio of the major isotopologue (Lee et al., 2005) yielded accuracy better than 0.06 ‰.Over a 7-day atmospheric measurement in Beijing, the two analyzers agreed to within -0.02 ± 0.18 ‰ after proper ***, even after calibration the difference between the two analyzers showed a slight correlation with concentration, and this concentration dependence propagated through the Keeling analysis, resulting in a much larger difference of 2.44 ‰ for the Keeling *** high sensitivity of the Keeling analysis to the concentration dependence underscores the challenge of IRIS for atmospheric research.

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Flux Footprint Climatology Estimated by Three Analytical Models of a Subtropical Coniferous Plantation in Southeastern China

Flux Footprint Climatology Estimated by Three Analytical Mod...

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第33届中国气象学会年会

作者：张慧温学发史奎桥杨扬 Jinzhou Ecology and Agriculture Meteorological Center Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences

Spatial heterogeneity poses a major challenge for the appropriate interpretation of eddy covariance data. The quantification of footprint climatology is fundamental to improve our understanding of carbon budgets, assessing the quality of eddy covariance data, and upscaling the representativeness of a tower flux to regional or global scales. In this study, we elucidated the seasonal variation of flux footprint climatologies and the major factors that influence them using the analytical FSAM, KM, and H models based on eddy covariance measurements at two and three times the canopy height at the Qianyanzhou site of China FLUX in 2003. The differences in footprints among the three models resulted from different underlying theories used to construct the models. An inter-comparison demonstrated that atmospheric stability was the main factor leading to differences among the three models. In neutral and stable conditions, the KM and FSAM values agreed with one another, but were lower than the H values. In unstable conditions, the agreement among the three models for rough surfaces was better than that for smooth surfaces, and the models showed greater agreement for a low measurement height than for a high measurement height. The seasonal flux footprint climatologies were asymmetrically distributed around the tower and corresponded well to the prevailing wind direction, which was north-northwest in winter and south-southeast in summer. The average sizes of the 90% flux footprint climatologies were 0.36–0.74 km and 1.5–3.2 km at altitudes of two and three times the canopy height, respectively. The average sizes were ranked by season as follows: spring > summer > winter > autumn. The footprint climatology clearly depended more on atmospheric stability on a daily scale than on a seasonal scale, and it increased with the increasing standard deviation of the lateral wind fluctuations.

关键词： eddy covariance flux footprint flux footprint climatology model comparison

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DEVELOPMENT OF CO2 FLUX DATA PROCESSING SYSTEM OF CHINAFLUX

DEVELOPMENT OF CO2 FLUX DATA PROCESSING SYSTEM OF CHINAFLUX

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2010年亚洲通量网会议(Asiaflux workshop2010)

作者： Xiaoli Ren Honglin He Min Liu Guirui Yu Xiaomin Sun Xuefa Wen Leiming Zhang Yuling Fu Chun Li Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Graduate University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

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Impacts of climate change and grazing intensity on soil organic carbon in alpine meadow

Impacts of climate change and grazing intensity on soil orga...

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International Conference on Business Management and Electronic Information (BMEI)

作者： Li, Xiaojia Zhang, Xianzhou Jiang, Hongtao Ma, Qinglong Shen, Zhenxi Fan, Yuzhi Yan, Wei Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China Graduate University Chinese Academy of Science Beijing China School of Geography Beijing Normal University Beijing China NO.2 Middle School of Xilingol League Xilinhot Inner Mongolia China

ISBN: (纸本)9781612841069

In this paper, soil organic carbon was simulated in the next 50 years with CENTURY model in different climate scenarios at Damxung alpine meadow ecosystem. The result shows that temperature and precipitation are the main contributor to the changes of soil organic carbon. Increase in temperature and precipitation can reduce the accumulation of soil organic carbon resulting in the release of soil carbon. Simulation results are consistent in three climate change scenarios (temperature and precipitation increasing, temperature increasing and precipitation unchangeable, temperature unchangeable and precipitation increasing). The content of soil organic carbon decreased, only slightly difference in extent in the three scenarios. Grazing intensity was also a main factor to affect soil organic carbon and the influence on soil organic fractions was different. © 2011 IEEE.

关键词： Climate change

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The simulation of runoff process of glacier and snowmelt dominated basin in Central Asia

The simulation of runoff process of glacier and snowmelt dom...

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IGU2013 International Conference on Water Sustainability in Arid Regions(第十届国际地理大会——水资源可持续发展论坛)

作者： RongGan YiLuo Yucheng Comprehensive Experimental Station Key Lab.of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina100101 University of Chinese Academy of Science BeijingChina100049 Yucheng Comprehensive Experimental StationKey Lab.of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina100101

Glaciers and snow meltwater play an important role in runoff regimes in Syrdarya River basin,which is the longest river of Central ***-driven changes in glacier-fed catchment have direct implications on runoff process.

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Litter mixing significantly affects decomposition in the Hulun Buir meadow steppe of Inner Mongolia, China

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Journal of Plant Ecology 2014年第1期7卷 59-67页

作者： Caihong Zhang Shenggong Li Leiming Zhang Xiaoping Xin Xingren Liu Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesDatun Road 11AChaoyangBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural SciencesBeijing 100081China Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesBeijing 100081China

Aims We explored the decomposition rates of single-and mixed-species litter,the litter-mixing effect and the effect of component litters in a mixture on *** In a litter bag experiment,shoot litters from two dominant grasses(Leymus chinensis and Stipa baicalensis)and one legume(Melissitus ruthenica)were decomposed separately and as a mixture from May 2010 to September 2011 in the Hulun Buir meadow steppe of Inner Mongolia,*** separated the litter mixture into its individual component litters(*** different single-species litters)and analyzed the changes in litter mass remaining and litter nitrogen(N)remaining during single-and mixed-species litter *** Findings(i)Litter mixing had significant positive effects on litter *** litter-mixing effect was strongest for the mixture of *** and *** litters,followed by the mixture of *** and *** litters.(ii)Single-species component litters decomposed faster in the mixtures than separately(positive effect),but these effects were not significant for legume species *** *** to single-species litter decomposition,the decomposition rates of the two grass(*** and ***)litters significantly increased when they were mixed with each other or with *** litter.(iii)For each species litter type,the percentage of litter N remaining during decomposition(NR)differed between the single-species litter and mixed litter *** NR of *** litter was higher when it was decomposed in the mixture than in ***,the NR of *** litter was lowest in its mixture with *** among the *** of its decomposition in the mixture or in isolation,the NR of *** litter varied little among *** was a significant positive relationship between the NR and percentage of initial litter mass remaining in both the single litter and mixed litter ***

关键词： non-additive effect interaction strength single litter mixed litter nutrient concentration

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modeling Hydrologic Processes in the Amu Darya River Basin of Central Asia Using SWAT-RSG

Modeling Hydrologic Processes in the Amu Darya River Basin o...

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IGU2013 International Conference on Water Sustainability in Arid Regions(第十届国际地理大会——水资源可持续发展论坛)

作者： Xiaolei Wang YiLuo Yucheng Comprehensive Experimental Station Key Lab.of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina100101 University of Chinese Academy of Science BeijingChina100049 Yucheng Comprehensive Experimental StationKey Lab.of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina100101

The rivers of semiarid central Asia have an important role in local water resources,providing drinking water,hydropower,and irrigation for both subsistence and large-scale *** to the influence of climate,environment a...

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