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Estimation of bioclimatic variables of Mongolia derived from remote sensing data

Frontiers of Earth Science 2022年第2期16卷 323-339页

作者： Munkhdulam OTGONBAYAR Clement ATZBERGER Erdenesukh SUMIYA Sainbayar DALANTAI Jonathan CHAMBERS Institute of geography and geoecology Mongolian Academy of Sciences(MAS)Ulaanbaatar 15170Mongolia Institute of Geomatics University of Natural Resources and Life Sciences(BOKU)Vienna 1190Austria School of Arts and Sciences National University of Mongolia(NUM)Ulaanbaatar 14201Mongolia Cooperazione Internazionale Milan 5020151Italy

Global maps of bioclimatic variables currently exist only at very coarse spatial resolution(***).For ecological studies requiring higher resolved information,this spatial resolution is often *** aim of this study is to estimate important bioclimatic variables of Mongolia from Earth Observation(EO)data at a higher spatial resolution of 1 *** analysis used two different satellite time series data sets:land surface temperature(LST)from Moderate Resolution Imaging Spectroradiometer(MODIS),and precipitation(P)from Climate Hazards Group Infrared Precipitation with Stations(CHIRPS).Monthly maximum,mean,and minimum air temperature were estimated from Terra MODIS satellite(collection 6)LST time series product using the random forest(RF)regression *** total precipitation data were obtained from CHIRPS version *** on this primary data,spatial maps of 19 bioclimatic variables at a spatial resolution of 1 km were generated,representing the period *** tested the relationship between estimated bioclimatic variables(SatClim)and WorldClim bioclimatic variables version 2.0(WorldClim)using determination coefficient(R^(2)),root mean square error(RMSE),and normalized root mean square error(nRMSE)and found overall good *** the set of 19 WorldClim bioclimatic variables,17 were estimated with a coefficient of determination(R^(2))higher than 0.7 and normalized RMSE(nRMSE)lower than 8%,confirming that the spatial pattern and value ranges can be retrieved from satellite data with much higher spatial resolution compared to *** the two bioclimatic variables related to temperature extremes(i.e.,annual mean diurnal range and isothermality)were modeled with only moderate accuracy(R^(2) of about 0.4 with nRMSE of about 11%).Generally,precipitation-related bioclimatic variables were closer correlated with WorldClim compared to temperature-related bioclimatic *** overall success of the modeling was attributed to the f

关键词： bioclimatic variables MODIS land surface temperature CHIRPS precipitation

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德国南部落叶阔叶林下常见植物的光适应性研究——以德国Kraichtal地区落叶阔叶林为例

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Acta Botanica Sinica 2001年第9期43卷 960-966页

作者：江源 Manfred MEURER 北京师范大学资源科学研究所 Institute of geography and geoecology

通过在 13个样地中测定林下相对照度和多个植物物种的盖度指标 ,建立了林下相对照度与林下植物盖度变化的相关关系 ,对德国南部落叶阔叶林下 12种植物的光适应性进行了分析。结合植物的生态因子指示值和种在群落中的恒有度等生态指标 ,... 详细信息

通过在 13个样地中测定林下相对照度和多个植物物种的盖度指标 ,建立了林下相对照度与林下植物盖度变化的相关关系 ,对德国南部落叶阔叶林下 12种植物的光适应性进行了分析。结合植物的生态因子指示值和种在群落中的恒有度等生态指标 ,探讨了林下植物群落地位的形成原因。结果表明 :1)在散射光条件下进行森林群落中的光照分布特征测定 ,能够降低光斑造成的干扰 ,获得相对稳定的光分布 ;2 )在被研究的 12个物种中 ,有 9种植物在林下的分布与光照条件相关显著 ,其中 7种植物的盖度与相对照度之间具有正相关关系 ,2种植物具有负相关关系。其余 3种植物的盖度与相对照度之间无显著的线性相关 ;3)与光指示值相比 ,盖度与照度之间关系的定量分析能够更清楚地反映林下植物的光适应性 ,揭示植物的光生态幅特征 ;4)光适应性直接影响着林下植物的种间关系 ,也影响着物种的群落地位和作用。光生态幅广的植物 ,在群落中具有较强的适应能力 ,因此能够在多种群落类型中出现 ,表现出较高的恒有度值。

关键词：德国南部植物光适应性指示值种间关系落叶阔叶林林下植物

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PALEOgeography OF THE SEYCHELLES BANKAND THE NORTHWEST MADAGASCAR SHELFDURING THE LAST GLACIO EUSTATICREGRESSION (18,000 a B.P)

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Chinese Journal of Oceanology and Limnology 1989年第1期7卷 89-92页

作者： D.D.Badyukov E.L.Demidenko P.A.Kaplin dept. of geography State Univ. Moscow USSRDept. of Geography State Univ. Moscow USSRDept. of Geography State Univ. Moscow USSR

The-Seychelles Bank and Madagascar Shelf in the western Indian Ocean were explored geologically during a cruise of the R/V "professor Shtokman" in 1986. Using the data of relief, sediment characteristics and their sequences of strata, paleogeographic maps (18,000 a B.P.) of these areas were produced. These maps show that the Bank and the Shelf are carbonate platforms with complicated topography. The data indicate an important role of sea level oscillation in relief development of this area.

关键词： carbonate strata lacustrine relief professor Indian cruise northwest sedimentation intrusive

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Thermokarst Lake Changes in the Southern Fringe of Siberian Permafrost Region in Mongolia Using Corona, Landsat, and ALOS Satellite Imagery from 1962 to 2007

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Advances in Remote Sensing 2016年第4期5卷 215-231页

作者： Adiya Saruulzaya Mamoru Ishikawa Yamkhin Jambaljav Graduate School of Environmental Science Hokkaido University Sapporo Japan Permafrost Department Institute of Geography and Geoecology Ulaanbaatar Mongolia

This study presents thermokarst lake changes at seven different sites in the continuous and isolated permafrost zones in Mongolia. Lakes larger than 0.1 ha were analyzed using Corona KH-4, KH-4A and KH-4B (1962-1968), Landsat ETM + (1999-2001), and ALOS/AVNIR-2 (2006-2007) satellite imagery. Between 1962 and 2007, the total number and area of lakes increased by +21% (347 to 420), and +7% (3680 ha to 3936 ha) in the continuous permafrost zone, respectively. These changes correspond to the appearance of 85 new lakes (166 ha) during the last 45 years. In contrast, lakes in the isolated permafrost zone have decreased by –42% (118 to 68) in number and –12% (422 ha to 371 ha) in area from 1962 to 2007. The changes in lake area and number are likely attributed to shifts in climate regimes and local permafrost conditions. Since 1962, the mean annual air temperature and potential evapotranspiration have increased significantly in the northern continuous permafrost zone compared to the southern isolated permafrost zone. Due to ongoing atmospheric warming without any significant trend in annual precipitation, patches of ice-rich subsurface have thawed, and the number and area of lakes have accordingly developed in the continuous permafrost zone. Shrinking of thermokarst lakes in the isolated permafrost zone may be due to disappearing permafrost, deepening of the active layer, and increased water loss through surface evaporation and subsurface drainage.

关键词： Thermokarst Lake Siberian Permafrost Region Mongolia Corona Landsat ALOS

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THE SIGNIFICANCE OF THE GREAT WALL AS A GEOGRAPHIC BOUNDARY

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Journal of Geographical Sciences 1996年第2期6卷 66-73页

作者： Feng Jiaping Cheng Liansheng Xu Zhenpu(dept. of geography, Beijing Normal University, Beijing 1000875 People’s Republic of China ) dept of geography Beijing Normal University Beijing 1000875 China

The Great Wall is not only the symbol of the ancient Chinese culture but also an actual and significant geographic boundary. The arrangements of the wall in past dynasties are based on physiographic conditions, and are just consistent with the demarcation line between semi-humid and arid climates in the country. Therefore,the Great Wall becomes an indicator of the demarcation line between the two *** extension and retreat of the wall generally reflect the expansion and shrinkage of farming and animal husbandry areas. From the viewpoint of political geography, the Great Wall can be regarded as the balance belt of 'forces' where the political powers of different nationalities histoncally stood facing each other and had repeated trials of strength. On one hand, the man-made wall of 10,000 li had the function of separating two political units, to some extent, the extension and retreat of the wall reflect the changes of relative strength of the two sides. On the other hand,the conflicts of the advanced and backward forces objectively promoted the economic and cultural exchanges as well as the national assimilation. Today, the Great Wall has lost its function of military works for territorial expansion and defense, but it is still the significant indicator as a geographic boundary and a sensitive area for many geographic elements.

关键词： Great Wall, geographical boundary significance

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Frozen ground and periglacial processes relationship in temperate high mountains: a case study at Monte Perdido-Tucarroya area(The Pyrenees, Spain)

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Journal of Mountain Science 2020年第5期17卷 1013-1031页

作者： SERRANO Enrique LóPEZ-MORENO Juan Ignacio GóMEZ-LENDE Manuel PISABARRO Alfonso MARTíN-MORENO Raúl RICO Ibai ALONSO-GONZáLEZ Esteban dept of GeographyUniversity of ValladolidValladolid 47011Spain dept of Geoenvironmental Processes and Global ChangePyrenean Institute of EcologyZaragoza 50.080Spain dept.Specific Didactics.Autonom University of Madrid.Madrid 28049Spain dept of GeographyPrehistory and ArcheologyUniversity of the Basque CountryVitoria 01006Spain

Seasonally frozen ground,mountain permafrost and cryogenic geomorphological processes are important components of the Pyrenean high *** work presents the results of a study on the distribution of frozen ground in a marginal and paraglacial environment of temperate *** inventory was made of landforms and indicators of frozen ground,and frozen ground was mapped *** 2014 and 2016 ground temperatures and thermal regimes were monitored,basal temperatures of snow-cover(BTS)were measured and a thermal map was *** thermal behaviours were detected among different elevations and slope *** processes are the most widespread,in which frost weathering and nivation,together with gelifluction and cryoturbation,are the most efficient processes;the latter two are generally linked to the presence of frozen *** fall in air and ground temperatures with altitude,slope orientations,and snowpack thickness and evolution determine ground thermal *** the study area,three types of thermal regimes were established:climate-controlled,snowcover-controlled,and frozen *** frozen ground occurs across a broad range of elevation between 2650 and 3075 m asl,whereas possible permafrost only occurs above 2750 m asl.

关键词： Geomorphology Periglacial Seasonally frozen ground Mountain permafrost Pyrenees

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Relationships Between Tidal Prism and Throat Area of Tidal Inlets Along Yellow Sea and Bohai Sea Coasts

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China Ocean Engineering 1996年第2期11卷 229-238页

作者： Zhang Renshun and Wang Yaping Professor, dept. of geography, Nanjing Normal University, Nanjing 210024 Lecturer, Nanjing Normal University, Nanjing 210024 dept. of geography Nanjing Normal University Nanjing 210024 Nanjing Normal University Nanjing 210024

The relationship between P (spring tidal prism) and A (throat area below mean sea level) is statistically analysed in terms of 29 tidal inlets or bays along the Huanghai Sea (Yellow Sea) and Bohai Sea coasts. For 15 of these tidal inlets, the best regression equation is A(km2) = 0.845 />(km3)1.20. The analysis shows that C and n are little different from those in the P-A relationship for the inlets of the South China Sea and East China Sea coasts. It is noted that the relationship between P and A is unstable because of the difference in sediment abundance. The study shows that a united P-A relationship can be obtained for the tidal inlets of lagoon type and bay-drowned-valley type, not containing some half-circle shape bays which confront deep water. These half-circle bays do not belong to tidal inlets because they do not have enough sediment abundance and are fairly open.

关键词： tidal inlet P-A relationship Huanghai Sea (Yellow Sea) Bohai Sea

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Improvement of Mongolian Height System Using a Satellite Technology

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Open Journal of Applied Sciences 2020年第4期10卷 154-168页

作者： Sodnom Enkhtuya Damdinsuren Amarsaikhan School of Geology and Mining Engineering Mongolian University of Science and Technology Ulaanbaatar Mongolia Institute of geography and geoecology Mongolian Academy of Sciences Ulaanbaatar Mongolia

In recent years, development of a proper country-specific height system has become a major challenge for the scholars and specialists working in the field of geodesy. The National Geodetic Services of many countries are trying to establish a new system that can provide the customers and decision-makers with high accuracy basic geodetic data obtained by modern satellite measurements. Although, Mongolia has a long tradition with geodesy and land surveying, the country still lacks a refined height system that can be effectively used for mapping and other purposes. In the present study, we tried to solve the problem related to the Mongolian height system using of a modern satellite technology. The research had some very important results: 1) evaluation of the main height network and height system of Mongolia, 2) development of a new method for calculating the normal height system in Mongolia, and 3) creation of the height unified system by considering surface potential of the global ellipsoidal level as normal.

关键词： Height System Astronomy Geodetic Control Network (AGCN) High Accuracy Geodetic Network (HAGN) State Geodetic Network (SGN)

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Measuring urban thermal environment from accessibility-based perspective:A case study in a populous city

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geography and Sustainability 2024年第3期5卷 329-342页

作者： Xinyu Dong Xiaoya Li Yanmei Ye Dan Su Runjia Yang Angela Lausch Department of Land Management Zhejiang UniversityHangzhou 310058China Department of Computational Landscape Ecology Helmholtz Centre for Environmental Research-UFZLeipzig 04318Germany Landscape Ecology Lab Geography DepartmentHumboldt-Universität zu BerlinBerlin 10099Germany Department of Physical geography and geoecology Martin Luther University Halle-WittenbergHalle 06120Germany Department of Architecture Facility Management and GeoinformationAnhalt University of Applied SciencesDessau 06846Germany

Understanding the spatial interaction among residents,cooling service,and heat risk area in complex urban areas is conducive to developing targeted ***,traditional urban thermal environment assessments typically relied on simple linear integration of associated indicators,often neglecting the spatial interaction *** explore the spatial interaction among the three elements,this study proposes an accessibility-based urban thermal environment assessment *** Zhengzhou,a rapidly urbanizing city,as an example,remotely sensed images from three periods(2010,2015 and 2020)were applied to extract urban green space(UGS)and hot island area(HIA).An improved two-step floating catchment area(2SFCA)method and bivariate local Moran’s I were employed to explore whether residents’clustering locations are more likely to access cooling service or to be exposed to heat *** results demonstrate that the UGS in the city has been expanding,whereas the HIA shrank within the inner city in 2015 and then increased in *** though the urban thermal environment may have improved in the last decade,the spatial interaction among the residents,cooling service and heat risk area could be *** autocorrelation shows an increase in locations that are disadvantageous for resident *** when sufficient cooling services were provided,residents in these areas could still be exposed to high heat *** developed urban thermal environment framework provides a novel insight into the residents’heat risk exposure and cooling service accessibility,and the findings could assist urban planners in targeting the improvement of extra heat exposure risk locations.

关键词： Urban heat island Urban green space Accessibility Remote sensing Spatial autocorrelation analysis

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Folk nomenclature of plants in Cistanche deserticola-associated community in South Gobi, Mongolia

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Plant Diversity 2020年第6期42卷 434-442页

作者： Urtnasan Mandakh Munkhjargal Battseren Danzanchadav Ganbat Turuutuvshin Ayanga Zolzaya Adiya Almaz Borjigidai Chunlin Long College of Life and Environmental Sciences Minzu University of ChinaBeijing100081China Key Laboratory of Ethnomedicine(Minzu University of China) Ministry of EducationBeijing100081China Institute of geography and geoecology Mongolian Academy of SciencesUlaanbaatar15170Mongolia Botanic Garden and Research Institute Mongolian Academy of SciencesUlaanbaatar210351Mongolia College of Geographical Science Inner Mongolia Normal UniversityHohhot010022China Department of geography School of Arts and SciencesNational University of MongoliaUlaanbaatar14201Mongolia School of Pharmacy Minzu University of ChinaBeijing100081China

Cistanche deserticola is an important medicinal plant in *** its significant role in local healing systems,little traditional knowledge had been *** present study investigated folk names of *** and other species of the same community in Umnugobi Province,South Gobi region of Mongolia,based on ethnobotanical *** high correspondence between folk names and scientific names of plant species occurring in Cistanche-associated community shows the scientific meaning of folk nomenclature and classification in *** Mongolian and folk names of plants were formed on the basis of observations and understanding of wild plants including their morphology,phenology and traditional uses as *** from this study will support the conservation of *** itself,a rare and endangered plant species listed in the Monglian Red Data *** documentation of folk nomenclature based on 96 plant species in the Cistanche community,as a part of traditional knowledge associated with biodiversity,will be very helpful for making strategy of plant biodiversity conservation in Mongolia.

关键词： Cistanche deserticola Plant community Ethnobotany Folk nomenclature Conservation strategy South gobi of Mongolia

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