检索结果-内蒙古大学图书馆

Attributing the divergent changes of drought from humid to dry regions across China

Journal of Hydrology 2025年 660卷

作者： Feng, Yao Sun, Fubao Deng, Xiaoya Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China College of Resources and Environment University of Chinese Academy of Sciences Beijing China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research Beijing China

Different drought indices can significantly influence our understanding of drought dynamics, particularly as evaporative demand intensifies with ongoing warming. This study investigated long-term drought variations across China using the Standardized Precipitation Index (SPI) and the Standardized Precipitation-Evaporation Index (SPEI). Additionally, we attributed divergent drought dynamics to climate and vegetation variations by applying Multivariate Nonlinear Regression models and Random Forest models. From 1982 to 2022, SPI exhibited a significant wetting trend (0.05/decade, p © 2025 Elsevier B.V.

关键词： Arid regions China Climate Drought Drought indices Humid regions

来源：评论

学校读者我要写书评

暂无评论

Temperature drives the variations in cropland exposure to compound drought and heatwave events under future climate in Northeast China

引用

Geography and Sustainability 2025年第4期6卷

作者： Zhang, Chuanwei Gao, Jiangbo Liu, Lulu Shen, Yanjun Wu, Shaohong Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing 101408 China Key Laboratory of Agricultural Water Resources Center for Agricultural Resources Research Institute of Genetics and Developmental Biology Chinese Academy of Sciences Shijiazhuang 050021 China

Exposure assessment is critical for hazard risk management. It is important to investigate the cropland exposure to compound drought and heatwave (CDHW) events because of their severe impacts on agriculture. We quantified the variations in CDHW characteristics (i.e., frequency, duration, and magnitude) and the cropland exposure to CDHW events in Northeast China using 20 CMIP6 climate projections for each of the four Shared Socioeconomic Pathways (i.e., SSP126, SSP245, SSP370, and SSP585). The results indicate that the intensification of CDHW events leading to an anticipated increase in cropland exposure ranges from 1.6-fold to 5.8-fold (the range describes the differences among SSPs), with the west and northeast of the region poised to experience more pronounced increases. Notably, adherence to the SSP126 pathway can reduce both the increase rate of CDHW magnitude and cropland exposure compared to other SSPs. Path analysis demonstrates that cropland exposure is primarily driven by maximum temperature (Tmax). Although precipitation (Pre) increases (0.36–0.75 mm year^-1), the rise in potential evapotranspiration (PET) due to global warming is higher than that of Pre (0.26–1.07 mm year^-1) except for SSP126, resulting in more drought events. Futhermore, elevated Tmax increases the frequency of extreme temperature events. Therefore, increases in Tmax and agricultural land area collectively contribute to exposure rise, with Tmax being the dominant factor in this process. Our findings emphasize the pivotal role of regulating the development pathway into SSP126 for sustainable agriculture, and optimizing crop patterns and planting heat-tolerant crop varieties are recommended for CDHW adaption. © 2025

关键词： CMIP6 Compound drought and heatwave events Cropland exposure Northeast China Risk management

来源：评论

学校读者我要写书评

暂无评论

Planting area and production decreased for winter-triticeae crops but increased for rapeseed in Ukraine with climatic impacts dominating

引用

Geography and Sustainability 2025年第2期6卷 108-116页

作者： Jichong Han Yuchuan Luo Zhao Zhang Jialu Xu Yi Chen Senthold Asseng Jonas Jägermeyr Christoph Müller Jørgen E Olesen Reimund Rötter Fulu Tao Joint International Research Laboratory of Catastrophe Simulation and Systemic Risk Governance School of National Safety and Emergency ManagementBeijing Normal UniversityZhuhai 519087China School of Systems science Beijing Normal UniversityBeijing 100875China Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station School of Geographical SciencesSouthwest UniversityChongqing 400715China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Technical University of Munich Department of Life Science EngineeringDigital AgricultureHEF World Agricultural Systems CenterFreisingGermany NASA Goddard Institute for Space Studies New YorkNYUSA Columbia University Center for Climate Systems ResearchNew YorkNYUSA Potsdam Institute for Climate Impacts Research(PIK) Member of the Leibniz AssociationPotsdamGermany Department of Agroecology Aarhus UniversityTjeleDenmark University of Götingen Tropical Plant Production and Agricultural Systems Modelling(TROPAGS)GötingenGermany University of Götingen Centre for Biodiversity and Sustainable Land Use(CBL)GötingenGermany College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

On-time mapping dynamics of crop area,yield,and production is important for global food *** information,however,is often not ***,we used satellite information,a spectral-phenology integration approach for mapping crop area,and a machine learning model for predicting yield in the war-stricken *** found that in Ukraine crop area and production declined in 2022 relative to 2017–2021 and 2021 for wintertriticeae crops,which was invaded before the cropping season in February of that *** the same time,crop area and production for rapeseed increased in Ukraine,with yields consistently lower by 6.5%relative to *** low precipitation and the Russian-Ukrainian conflict-related factors contributed to such yield variations by-1.3%and-0.9%for winter-triticeae crops and-4.2%and-0.5%for rapeseed in *** demonstrate a robust framework for monitoring country-wide crop production dynamics in near real-time,serving as an early-foodsecurity-warning system.

关键词： Food security Conflict Machine learning Production Satellite

来源：评论

学校读者我要写书评

暂无评论

Unraveling soil salinity on potentially toxic element accumulation in coastal Phragmites australis: A novel integration of multivariate and interpretable machine-learning models

引用

Marine pollution bulletin 2025年 217卷 118072页

作者： Mengge Zhou Yi Yang Yan Guo Linglong Chen Ziqiao Li XiaoYong Liao Yonghua Li Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China. Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China. Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China. Electronic address: yhli@***.

Revealing the key mechanisms influencing the behavior of potentially toxic elements (PTEs) in soil-plant systems is of great significance for environmental protection and grassland development in coastal areas. This study utilized redundancy analysis to assess the effects of soil environmental variables on the concentrations and enrichment of various PTEs in the advantageous forage species Phragmites australis. Advanced models like PLS-PM and RF-SHAP quantitatively assessed soil salinity impacts. The main findings are as follows: (1) P. australis exhibited enrichment capacity for Cd, Cr, and Cu. (2) Soil pH, exchangeable potassium (aK), and exchangeable calcium (aCa) were key determinants of PTE distribution, with Cu being highly sensitive to these variables. (3) Significant interactions between soil electronic conductivity (EC) and pH, as well as between soil EC and aCa (p < 0.01). (4) A pH value of 8.30 and an aCa concentration of 4.4 g/kg were identified as critical thresholds affecting the Cu uptake. These results provide insights into PTE migration and management strategies for coastal grasslands.

关键词： Cu PLS-PM Phragmites australis RF-SHAP Soil salinity

来源：评论

学校读者我要写书评

暂无评论

Flood complexity and rising exposure risk in High Mountain Asia under climate change

引用

Science Bulletin 2025年

作者： Bai, Yuanyuan Li, Dongfeng Wangchuk, Sonam Kettner, Albert Zhao, Yi Deng, Rui Liu, Yong Xiao, Cunde Ni, Jinren Cui, Peng Key Laboratory for Water and Sediment Sciences Ministry of Education College of Environmental Sciences and Engineering Peking University Beijing100871 China State Environmental Protection Key Laboratory of All Materials Flux in River Ecosystems Peking University Beijing100871 China Institute of Carbon Neutrality Peking University Beijing100871 China Institute of Tibetan Plateau Peking University Beijing100871 China International Centre for Integrated Mountain Development Kathmandu44600 Nepal CSDMS Institute of Arctic and Alpine Research University of Colorado Boulder BoulderCO80309-0545 United States State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Beijing100875 China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu610299 China

来源：评论

学校读者我要写书评

暂无评论

Seasonal Variation in Air Temperature and Relative Humidity on Building Areas and in Green Spaces in Beijing, China

引用

Chinese Geographical Science 2020年第1期30卷 75-88页

作者： KUANG Wenhui Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences

The cooling and humidifying effects of urban parks are an essential component of city ecosystems in terms of regulating microclimates or mitigating urban heat islands(UHIs).Air temperature and relative humidity are two main factors of thermal environmental comfort and have a critical impact on the urban environmental quality of human *** measured the 2-m height air temperature and relative humidity at the Beijing Olympic Park and a nearby building roof for more than 1 year to elucidate seasonal variations in air temperature and relative humidity,as well as to investigate the outdoor thermal *** results showed that the lawn of the park could,on average,reduce the air temperature by(0.80±0.19)℃,and increase the relative humidity by(5.24±2.91)% relative to the values measured at the building roof during *** the nighttime,the lawn of the park reduced the air temperature by(2.64±0.64)℃ and increased the relative humidity by(10.77±5.20)%.The park was cooler and more humid than surrounding building area,especially in night period(more pronounced cooling with 1.84℃).Additionally,the lawn of the park could improve outdoor thermal comfort through its cooling and humidifying *** level of thermal comfort in the park was higher than that around the building roof for a total of 11 days annually in which it was above one or more thermal comfort levels(average reduced human comfort index of 0.92)except during the winter.

关键词： air temperature relative humidity outdoor thermal comfort urban park planning

来源：评论

学校读者我要写书评

暂无评论

Solar forcing of desert vegetation and drought frequency during the last 2700 years in the interior Qaidam Basin, northeastern Tibetan Plateau

引用

Science China Earth Sciences 2020年第4期63卷 561-574页

作者： Quan LI Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Knowledge of long-term change in vegetation and climate in semi-arid/arid regions is essential for the study of current climate and development of mitigation strategies against severe drought. Here, a fossil pollen record of annually-varved core from Sugan Lake in interior Qaidam Basin was quantitatively analyzed to reconstruct changes in vegetation, floristic diversity and drought frequency. Results of biomization suggested that regional vegetation was desert vegetation with three short-term occupations of temperate steppe/xerophytic shrub during the last 2700 years. Floristic diversity generally increased/decreased with the expansion/degradation of desert vegetation. Moisture fluctuations showed three distinct stages(extremely dry between 742 BC and ~AD500, relatively wet with an increasing trend between ~AD500 and 1200 and relatively wet with frequent fluctuations after AD1200), interrupted by 14 drought events. Spectral analysis and continuous wavelet transform of moisture variation revealed 200-and 120-year cycles. According to cross-wavelet transform analysis, major drought frequency of ~200-year was explicitly correlated to solar activity. It's suggested that the centennial-scale drought frequency was mainly driven by solar activity, through modulation of large-scale atmospheric circulation. Furthermore, the effect of surface temperature–evaporation and uplifting/subsiding air flow should be notable. The climatic drought in interior Qaidam Basin could be intensified under the continuous global warming.

关键词： Pollen Vegetation change Drought frequency Qaidam Basin Northeastern Tibetan Plateau

来源：评论

学校读者我要写书评

暂无评论

Modern pollen assemblages of the surface lake sediments from the steppe and desert zones of the Tibetan Plateau

引用

Science China Earth Sciences 2021年第3期64卷 425-439页

作者： Feng QIN Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing100101China

Modern pollen analysis is the basis for revealing the palaeovegetation and palaeoclimate changes from fossil pollen *** studies pertaining to the modern pollen assemblages on the Tibetan Plateau have been conducted,but little attention has been paid to pollen assemblages of surface lake *** this study,modern pollen assemblages of surface lake sediments from 34 lakes in the steppe and desert zones of the Tibetan Plateau are investigated and results indicate that the two vegetation zones are dominated by non-arboreal pollen taxa and show distinctive *** pollen assemblages from the desert zone contain substantially high relative abundance of Chenopodiaceae while those from the steppe zone are dominated by *** ratios show great potential in terms of separating different vegetation zones and to indicate climate changes on the Tibetan *** Artemisia/Chenopodiaceae ratio and arboreal/non-arboreal pollen ratio could be used as proxies for winter ***/Cyperaceae ratio and the sum of relative abundance of xerophilous elements increase with enhanced warming and *** considering the vegetation coverage around the lakes,hierarchical cluster analysis suggests that the studied sites can be divided into four clusters:meadow,steppe,desert-steppe,and *** pollen-based vegetation classification models are established using a random forest *** random forest model can effectively separate the modern pollen assemblages of the steppe zone from those of the desert zone on the Tibetan *** model for distinguishing the four vegetation clusters shows a weaker but still valid classifying *** is expected that the random forest model can provide a powerful tool to reconstruct the palaeovegetation succession on the Tibetan Plateau when more pollen data from surface lake sediments are included.

关键词： Modern pollen assemblage Tibetan Plateau surface lake sediment Pollen-climate relationship Pollen-based vegetation classification model

来源：评论

学校读者我要写书评

暂无评论

Chemical fertilizer rate, use efficiency and reduction of cereal crops in China, 1998–2018

引用

Journal of Geographical Sciences 2022年第1期32卷 65-78页

作者： XIN Liangjie Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China

This paper studied the fertilizer rate(FR), fertilizer use efficiency(FUE) and fertilizer overuse rate(FOR) of rice, corn and wheat in China from 1998 to 2018 and briefly analysed the reasons why farmers were willing to apply more fertilizers.(1) The FR of grain in China reached 373.7 kg/ha in 2018, an increase of 26.8% compared to that in 1998. In 2018, the FR for corn was the highest, at 411.2 kg/ha, compared to the values of 338.3 kg/ha for rice and 371.7 kg/ha for wheat.(2) In recent years, the FUE of grain in China has obviously improved, with values of 32.9% in 1998, 36.7% in 2008, and 39.3% in 2018. In 2018, the FUE for rice was the highest(41.2%), followed by that for corn(39.9%), and the FUE for wheat was the lowest(36.0%).(3) By 2018, fertilizer was overused in all zones of rice, corn and wheat. In 2018, the average FOR for wheat reached 69.0%, which was 35.9% higher than that for corn and 42.8% higher than that for rice.(4) The lower price of chemical fertilizers was the main reason leading to overapplication.(5) Establishing market mechanisms and adjusting regional planting structures can be effective in reducing the application of chemical fertilizers.

关键词： fertilizer rate(FR) fertilizer use efficiency(FUE) fertilizer overuse rate(FOR) China 1998–2018 three main grain crops

来源：评论

学校读者我要写书评

暂无评论

Governance on provision of ecosystem and its services in Nepal: Lessons from appraisal of policy, legislation, and institution

引用

Geography and Sustainability 2025年第4期6卷

作者： Nepal, Pashupati Paudel, Basanta Zhang, Yili Khanal, Narendra Raj Liu, Linshan Rai, Mohan Kumar Nepal, Nirdesh Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China Kathmandu Center for Research and Education Chinese Academy of Sciences - Tribhuvan University Kathmandu Kirtipur Nepal Central Department of Geography Tribhuvan University Kathmandu Nepal

Ecosystem degradation and the loss of ecosystem services stem from multiple causes, requiring coordinated and diverse policies, legislation, and institutional responses to effectively address them. An understanding of the policies, legislation, and institutions governing ecosystem services can enhance the sustained management and provision of ecosystem services. Therefore, this work appraises the policies, legislation and institutional provisions made by the government of Nepal. In addition, this study analyzes policy implications and identifies gaps and barriers that hinder future improvements in the management of ecosystem services. Altogether, 63 documents comprising 45 policies and 18 legislations promulgated by the government of Nepal have been assessed for content analysis. Twenty key Informant Interviews (KIIs) have also been conducted to obtain expert insights about the gaps in policy formulation and implementation. The results indicate that though several sectoral policies and legislations have made provision on management of ecosystem and its services implicitly or explicitly, still there is lacking of overarching framework to deal with ecosystem services. Overlapping roles and responsibilities outlined in the constitution, policies, and legislation, coupled with weak enforcement and lack of multisectoral coordination mechanism, are significant obstacles to effective policy implementation. Therefore, there is a need to develop an overarching national framework backed up by legislation with a strong multisectoral coordination mechanism that will adopt a holistic and multidisciplinary approach to the sustained management and provision of the ecosystem and its services. © 2025

关键词： Ecosystem services Governance Legislation Nepal Policies

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：