检索结果-南通市图书馆

Spatial differentiation in stable isotope compositions of surface waters and its environmental significance in the Issyk-Kul Lake region of central asia

引用

Journal of Mountain Science 2018年第2期15卷 254-263页

作者： MA Long JILILI Abuduwaili LI Yao-ming State Key Laboratory of Desert and Oasis ecology Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China CAS research center for ecology and environment of central asia Urumqi 830011 China

Stable isotope values of oxygen （180） and hydrogen （2H） of surface waters were used to study the origin and environmental significanees in the Issyk-Kul basin of Kyrgyzstan in central asia, which is the most important intermountain basin in the modern Tien Shan orogen. This study is the first analysis of hydrochemical spatial differentiation in the stable isotopes of surface waters in this watershed. 75 samples were collected from rivers, springs, lakes, rain and snow during the rainy season in July and August of 2o16. Stable isotopes of 180 and 2H were studied for all samples, and cation ratios （Sr/Ca and Mg/Ca） were also determined for lake water samples. Stable isotope values from precipitation scattered around the Local Meteoric Water Line （determined from Urumqi Station of the global network of isotopes in precipitation （GNIP））, together with values of the Deuterium excess parameter （d） from 15.3‰ to 30.5‰, with an average of 19.8‰, indicating that the moisture sources are primarily from regions with low relative humidity. The 8180 and 52H values were significantly different between the river and lake samples, indicating that regional evaporation caused the isotopic enrichment of lake water. Geospatial autocorrelation, measured by Moran＇s I coefficient, indicated weak spatial autocorrelation within stable isotopes of oxygen and hydrogen in the surface waters of the studied area, which is primarily an effect of climate during the water chemistry evolution. The cation ratios Sr/Ca and Mg/Ca in lake water samples were not correlated with the concentration of total dissolved solids, but did show correlation with stable isotopic values, which is significant for paleoenvironmental reconstruction.

关键词： Spatial differentiation Stable isotope Moisture Sources Geospatial autocorrelation IssykKul Lake central asia

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Diet characteristics of wild sheep(Ovis ammon darwini) in the Mengluoke Mountains,Xinjiang,China

引用

Journal of Arid Land 2018年第3期10卷 482-491页

作者： LI Bang XU Wenxuan David A BLANK WANG Muyang YANG Weikang Key Laboratory of Biogeography and Bioresource in Arid Land Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China research center for ecology and environment of central asia Bishkek 720001 Kyrgyzstan

In most arid and semi-arid regions of the world, domestic livestock and native wildlife share pastures, and their competition for forage and habitat is thought to be a serious conservation issue. Moreover, unmanaged grazing by livestock can cause the population decline in wild ungulates. The diet of an animal species is a determining aspect of its ecological niche, and investigating its diet has been one of the initial steps in basic ecology study of a new species. To get an approximate understanding of the interspecific food relationships of argali（Ovis ammon darwini） between sexes, and sympatric domestic sheep and goats, we compared the diet compositions and diet-overlaps among these herbivores, i.e., male argali, female argali, domestic sheep, and domestic goats in the Mengluoke Mountains of Xinjiang, China by using micro-histological fecal analysis. Female argali, male argali, domestic sheep and domestic goat primarily consumed forbs（43.31%±4.86%）, grass（36.02%±9.32%）, forbs（41.01%±9.18%）, and forbs（36.22%±10.61%）, respectively in warm season. All these animals consumed mostly shrubs（female argali： 36.47%±7.56%; male argali： 47.28%±10.75%; domestic sheep： 40.46%±9.56%; and domestic goats： 42.88%±9.34%, respectively） in cold season. The diet-overlaps were relatively high among all species in cold season with values ranging from 0.88 to 0.94. Furthermore, Schoener＇s index measured between each possible pair of 4 herbivores increased from the warm season to the cold season. The results illustrate that the high degree of diet-overlap of argali and domestic livestock（sheep and goat） may pose a threat to the survival of the argali in cold season. From the viewpoint of rangeland management and conservation of the endangered argali, the numbers of domestic sheep and goats should be limited in cold season to reduce food competition.

关键词： argali fecal analysis food habits competition diet-overlap

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Antelope adaptations to counteract overheating and water deficit in arid environments

引用

Journal of Arid Land 2022年第10期14卷 1069-1085页

作者： David BLANK LI Yaoming research center for ecology and environment of central asia BishkekKyrgyzstan State Key Laboratory of Desert and Oasis ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China

Many arid areas have very severe climates with extremely high summer temperatures,strong solar radiation,and a lack of drinking water during the driest ***,antelopes living in arid areas are forced to solve two main problems:avoiding overheating and maintaining water ***,there are physiological,morphological,and behavioral mechanisms for antelope adaptations to arid *** the mechanisms,behavioral adjustments have a minimal cost and are activated first,while physiological mechanisms are the most energetically costly and involve adaptations to high temperatures when other mechanisms are *** previous publications,some examples of the antelope behavioral adaptations have been described only rarely,while in this review,we try to clarify all available information on the adaptations of antelopes living in arid areas to their native environments,paying particular attention to behavioral *** mechanisms,especially daily activity,diet and microclimate selection,and migrations,are so important and commonly used by antelopes in natural conditions,in which physiological mechanisms are usually not *** adjust their behaviors according to environmental changes so successfully that purely physiological mechanisms are discovered under laboratory conditions;for example,adaptive heterothermia or selective brain cooling phenomenon is difficult to observe in their natural *** review provides a better understanding of the main behavioral mechanisms of antelope adaptations to arid environments and allows for the identification of the key factors for successful conservation of antelopes in their natural habitats.

关键词： antelopes desert antelopes behavioral mechanisms drinking water water loss behaviors arid environments

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Spatial distribution of snow depth based on geographically weighted regression kriging in the Bayanbulak Basin of the Tianshan Mountains, China

引用

Journal of Mountain Science 2018年第1期15卷 33-45页

作者： LIU Yang LI Lan-hai CHEN Xi YANG Jin-Ming HAO Jian-Sheng State Key Laboratory of Desert and Oasis ecology Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China CAS research center for ecology and environment of central asia No.818 South Beijing Road Urumqi 830011 China Institute of Arid ecology and environment Xinjiang University Urumqi 830046 China

Snow depth is a general input variable in many models of agriculture,hydrology,climate and *** study makes use of observational data of snow depth and explanatory variables to compare the accuracy and effect of geographically weighted regression kriging(GWRK)and regression kriging(RK)in a spatial interpolation of regional snow *** auxiliary variables are analyzed using correlation coefficients and the variance inflation factor(VIF).Three variables,Height,topographic ruggedness index(TRI),and land surface temperature(LST),are used as explanatory variables to establish a regression model for snow *** estimated spatial distribution of snow depth in the Bayanbulak Basin of the Tianshan Mountains in China with a spatial resolution of 1 km is *** results indicate that 1)the result of GWRK's accuracy is slightly higher than that of RK(R^2=0.55 vs.R^2=0.50,RMSE(root mean square error)=0.102 m ***=0.077 m);2)for the subareas,GWRK and RK exhibit similar estimation results of snow *** in the Bayanbulak Basin with a snow depth greater than 0.15m are mainly distributed in an elevation range of 2632.00–3269.00 m and the snow in this area comprises 45.00–46.00% of the total amount of snow in this ***,the GWRK resulted in more detailed information on snow depth distribution than the *** final conclusion is that GWRK is better suited for estimating regional snow depth distribution.

关键词： Snow depth Spatial distribution Regression kriging Geographically weighted regression kriging

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Time-sensitive prediction of NO_(2) concentration in China using an ensemble machine learning model from multi-source data

引用

Journal of environmental Sciences 2024年第3期137卷 30-40页

作者： Chenliang Tao Man Jia Guoqiang Wang Yuqiang Zhang Qingzhu Zhang Xianfeng Wang Qiao Wang Wenxing Wang Big Data research center for ecology and environment Environment Research InstituteShandong UniversityQingdao 266237China Shandong Provincial Eco-environment Monitoring center Jinan 250101China

Nitrogen dioxide(NO_(2))poses a critical potential risk to environmental quality and public health.A reliable machine learning(ML)forecasting framework will be useful to provide valuable information to support government *** on the data from1609 air quality monitors across China from 2014-2020,this study designed an ensemble ML model by integrating multiple types of spatial-temporal variables and three sub-models for time-sensitive prediction over a wide *** ensemble ML model incorporates a residual connection to the gated recurrent unit(GRU)network and adopts the advantage of Transformer,extreme gradient boosting(XGBoost)and GRU with residual connection network,resulting in a 4.1%±1.0%lower root mean square error over XGBoost for the test *** ensemble model shows great prediction performance,with coefficient of determination of 0.91,0.86,and 0.77 for 1-hr,3-hr,and 24-hr averages for the test results,*** particular,this model has achieved excellent performance with low spatial uncertainty in central,East,and North China,the major site-dense *** the interpretability analysis based on the Shapley value for different temporal resolutions,we found that the contribution of atmospheric chemical processes is more important for hourly predictions compared with the daily scale predictions,while the impact of meteorological conditions would be ever-prominent for the *** with existing models for different spatiotemporal scales,the present model can be implemented at any air quality monitoring station across China to facilitate achieving rapid and dependable forecast of NO_(2),which will help developing effective control policies.

关键词： Air quality prediction Deep learning Ensemble method Nitrogen dioxide Spatiotemporal covariates

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

research on the implementation of the Convention on Biological Diversity among the Shanghai Cooperation Organisation countries

引用

Regional Sustainability 2023年第3期4卷 322-331页

作者： HAO Yun WU Miao ZHANG Xiaoyun WANG Lixian HE Jingjing Xinjiang Institute of ecology and Geography Chinese Academy of SciencesUrumqi830011China research center for ecology and environment of central asia Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi830011China

The Shanghai Cooperation Organisation(SCO)is the most extensive and populous comprehensive regional cooperation organization in the world,covering about half of the world's population,with not only a huge consumer market,but also rich natural resources and strong *** one of the important platforms for the implementation of the Green Belt and Road Initiative,it is an important opportunity for the SCO to actively participate in global governance and contribute to building a community of global *** investigate the status of biodiversity conservation in the SCO countries,we used literature analysis *** surveyed the performance and international cooperation status of the SCO countries in the implementation of the Convention on Biological Diversity(CBD),listed facing problems and threats to biodiversity conservation,including not optimistic biodiversity conservation project implementation status,contradiction between ecological protection and economic development,impacts of human activities,lack of funds and talents,etc.,and analyzed the biodiversity protection needs of the SCO countries from the perspectives of project and policy implementation status and international *** to the cooperation between China and the other SCO countries on biodiversity conservation and the post-2020 global biodiversity framework goals,we gave some recommendations:(1)promoting access to genetic resources and benefit-sharing;(2)integrating multiple funds and innovating the implementation of funding mechanism;(3)developing talent training and exchange programs and deepening multilateral cooperation;(4)strengthening cross-border cooperation and improving cooperation network;and(5)establishing a coordination mechanism for biodiversity conservation within the framework of the SCO.

关键词： Shanghai Cooperation Organisation(SCO) Biodiversity conservation Convention on Biological Diversity(CBD) International cooperation Cross-border cooperation Multilateral cooperation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Extreme Flood Events over the Past 300 Years Inferred from Lake Sedimentary Grain Sizes in the Altay Mountains,Northwestern China

引用

Chinese Geographical Science 2018年第5期28卷 773-783页

作者： ZHOU Jianchao WU Jinglu ZENG Haiao State Key Laboratory of Lake Science and environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China University of Chinese Academy of Sciences Beijing 100049 China research center for ecology and environment of central asia Chinese Academy of Sciences Urumqi 830011 China

Understanding the temporal variations of extreme floods that occur in response to climate change is essential to anticipate the trends in flood magnitude and frequency in the context of global warming. However, long-term records of paleofloods in arid regions are scarce, thus preventing a thorough understanding of such events. In this study, a reconstruction of paleofloods over the past 300 years was conducted through an analysis of grain sizes from the sediments of Kanas Lake in the Altay Mountains of northwestern China. Results showed that grain parameters and frequency distributions can be used to infer possible abrupt environmental events within the lake sedimentary sequence, and two extreme flood events corresponding to ca. 1736–1765 AD and ca. 1890 AD were further identified based on canonical discriminant analysis(CDA) and coarse percentile versus median grain size(C-M) pattern analysis, both of which occurred during warmer and wetter climate conditions by referring to tree-ring records. These two flood events are also evidenced by lake sedimentary records in the Altay and Tianshan mountains. Furthermore, through a comparison with other records, the flood event from ca. 1736–1765 AD in the study region seems to have occurred in both the arid central asia and the Alps in Europe, and thus may have been associated with changes in the North Atlantic Oscillation(NAO) index.

关键词： flood events grain size Kanas Lake Altay Mountains North Atlantic Oscillation(NAO)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Ecological biomass allocation strategies in plant species with different life forms in a cold desert, China

引用

Journal of Arid Land 2019年第5期11卷 729-739页

作者： FAN Lianlian DING Junxiang MA Xuexi LI Yaoming Xinjiang Institute of ecology and Geography Chinese Academy of SciencesUrumqi 830011China research center for ecology and environment of central asia Chinese Academy of SciencesUrumqi 830011China Fukang Station of Desert ecology Chinese Academy of SciencesFukang 8315005China Chengdu Institute of Biology Chinese Academy of SciencesChengdu 610041China

Biomass allocation patterns among plant species are related to their adaptive ecological strategies. Ephemeral, ephemeroid and annual plant life forms represent three typical growth strategies of plants that grow in autumn and early spring in the cold deserts of China. These plants play an important role in reducing wind velocity in the desert areas. However, despite numerous studies, the strategies of biomass allocation among plant species with these three life forms remain contentious. In this study, we conducted a preliminary quadrat study during 2014–2016 in the southern part of the Gurbantunggut Desert, China, to investigate the allocation patterns of above-ground biomass(AGB) and below-ground biomass(BGB) at the individual level in 17 ephemeral, 3 ephemeroid and 4 annual plant species. Since ephemeral plants can germinate in autumn, we also compared biomass allocation patterns between plants that germinated in autumn 2015 and spring 2016 for 4 common ephemeral species. The healthy mature individual plants of each species were sampled and the AGB, BGB, total biomass(TB), leaf mass ratio(LMR) and root/shoot ratio(R/S) were calculated for 201 sample quadrats in the study area. We also studied the relationships between AGB and BGB of plants with the three different life forms(ephemeral, ephemeroid and annual). The mean AGB values of ephemeral, ephemeroid and annual plants were 0.806, 3.759 and 1.546 g/plant, respectively, and the mean BGB values were 0.106, 4.996 and 0.166 g/plant, respectively. The mean R/S value was significantly higher in ephemeroid plants(1.675) than in ephemeral(0.154) and annual(0.147) plants. The mean LMR was the highest in annual plants, followed by ephemeroid plants and ephemeral plants, reflecting the fact that annual plants allocate more biomass to leaves, associated with their longer life span. Biomass of ephemeral plants that germinated in autumn was significantly higher than those of corresponding plants that germinated in spring in

关键词： above-ground biomass below-ground biomass plant life forms herbaceous species allometric hypothesis isometric hypothesis Gurbantunggut Desert

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Criteria for assessing carbon emissions peaks at provincial level in China

引用

Advances in Climate Change research 2022年第1期13卷 131-137页

作者： Min WANG Peng WANG Liang WU Ru-Pu YANG Xiang-Zhao FENG Meng-Xue ZHAO Xiao-Lin DU Yu-Jia WANG Department of Energy and environmental Policy research Policy Research Center for Environment and EconomyMinistry of Ecology and EnvironmentBeijing 100029China research center for environmental&ecology Strategic Planning and Regional Development Policy Research Center for Environment and Economy.Ministry of Ecology and EnvironmentBeijing 100029China Institute of Geographic Sciences and Natural Resources research Chinese Academy of SciencesBeijing 100101China College of environment Science and Engineering Nankai UniversityTianjin 300350China

China has pledged to peak carbon emissions by 2030 and neutralize emissions by *** is an urgent need to develop a comprehensive and reliable methodology to judge whether a region has reached its carbon emissions peak(CEP),as well as to schedule and prioritize mitigation activities for different *** this study,we developed an approach for identifying the CEP status of 30 provincial areas in China,considering both the carbon emissions trends and the main socioeconomic factors that influence these *** to the results of the Mann-Kendall(MK)tests,changes in carbon emissions for the 30 provincial areas can be grouped inlo four clusters:those with significant reductions,marginal reductions,marginal increases,and significant ***,total energy consumption(TEC),the proportion of coal consumption(PCC),the proportion of the urban population(PUP),the proportion of secondary industry(PASP),and per capita GDP(PGDP)were further identified as the main factors influencing carbon emissions,by applying Redundancy analysis(RDA)and Monte Carlo permutation *** balance efficacy with fairness,we assigned scores from 1 to 4 to trends in carbon emissions,and the Group Analysis results of the main influencing factors above except for TEC;for TEC,main basis is the relevant assessment *** finally,according to the actual condition of total scores,provincial areas were assigned to the first,second,third and fourth stage of progress toward CEP,using the method of Natural Breaks(Jenks).Based on the method,differentiated plans should be adopted from the perspective of fair development and emissions reduction efficiency,in accordance with the basic principles of Doing the Best within Capacity and Common but Differentiated *** classification method can also be adopted by other developing countries which have not yet achieved CEP.

关键词： Carbon emission peak(CEP) Influencing factors Determination methods Stage classification Provincial level

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Climate change, water resources and sustainable development in the arid and semi-arid lands of central asia in the past 30 years

引用

Journal of Arid Land 2019年第1期11卷 1-14页

作者： YU Yang PI Yuanyue YU Xiang TA Zhijie SUN Lingxiao Markus DISSE ZENG Fanjiang LI Yaoming CHEN Xi YU Ruide Xinjiang Institute of ecology and Geography Chinese Academy of Sciences research center for ecology and environment of central asia Chinese Academy of Sciences Cele National Station of Observation and research for Desert-Grassland Ecosystem University of Chinese Academy of Sciences Chinese Academy of Forestry State Key Laboratory of Desert and Oasis ecology Chinese Academy of Sciences Chair of Hydrology and River Basin Management Technical University of Munich School of environment and Material Science Yantai University

The countries of central asia are collectively known as the five "-stans": Uzbekistan, Kyrgyzstan, Turkmenistan, Tajikistan and Kazakhstan. In recent times, the central asian region has been affected by the shrinkage of the Aral Sea, widespread desertification, soil salinization, biodiversity loss, frequent sand storms, and many other ecological disasters. This paper is a review article based upon the collection, identification and collation of previous studies of environmental changes and regional developments in central asia in the past 30 years. Most recent studies have reached a consensus that the temperature rise in central asia is occurring faster than the global average. This warming trend will not only result in a higher evaporation in the basin oases, but also to a significant retreat of glaciers in the mountainous areas. Water is the key to sustainable development in the arid and semi-arid regions in central asia. The uneven distribution, over consumption, and pollution of water resources in central asia have caused severe water supply problems, which have been affecting regional harmony and development for the past 30 years. The widespread and significant land use changes in the 1990 s could be used to improve our understanding of natural variability and human interaction in the region. There has been a positive trend of trans-border cooperation among the central asian countries in recent years. International attention has grown and research projects have been initiated to provide water and ecosystem protection in central asia. However, the agreements that have been reached might not be able to deliver practical action in time to prevent severe ecological disasters. Water management should be based on hydrographic borders and ministries should be able to make timely decisions without political intervention. Fully integrated management of water resources, land use and industrial development is essential in central asia. The ecological crisis should provide

关键词： central asia climate change water resources arid and semi-arid lands land use changes sustainable development socio-economic development

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：