检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Yuan, Huanhuan Yan, Jiabao liu, Ying Peng, Jie Wang, Xiaoyue Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment Nanjing Jiangsu210042 China The Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China Sino-French Institute for Earth System Science College of Urban and Environmental Sciences Peking University Beijing100871 China State Key Laboratory of Grassland Agro-Ecosystems College of Ecology Lanzhou University Lanzhou730000 China

Plant phenology variation is shaped by the complex interplay between current environmental conditions and the legacy effects of biological factors. The interaction of the start and end of the growing season (SOS and EOS) may offset the responses of the phenology change trends to climate change if not specifically accounted for. These interactions among phenological events have been demonstrated to influence phenological processes, but the relative importance of biological and environmental factors on phenological response to climate warming remains untested. Therefore, we used multi-source remote sensing data and empirical approaches to examine the influence of plant phenological carry-over effects on EOS over time and the maximum score of importance in projection for phenological variables (i.e., VIP score) in northern 30°N. Results showed that the most important biological factor was significantly positively correlated with EOS during 1982-2015 (long-period, lP) and 2001-2018(Short-period, SP) for 40.02% and 11.21% of the study pixels. However, the biological factor underly drive changed from one-year previous EOS to the current year SOS with scarcely influenced by spatial resolution and sensors. Simultaneously, the influence of climate factors on EOS increased especially FRS with a significant (P © 2022, The Authors. All rights reserved.

关键词： Climate change

来源：评论

学校读者我要写书评

暂无评论

Toxicological Effects and Toxicity Thresholds Of lolium Perenne l. And Medicago Sativa l. Grown in Nh4+-Contaminated Soil from Ion-Type Rare Earth Mining Areas

SSRN

引用

SSRN 2022年

作者： Yang, Huixian Zhou, Jun Fei, Jiasai Ci, Kaidong li, Demin Fan, Jianbo Wei, Chaoyang Zhou, Jing Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of Sciences Nanjing210008 China National Engineering and Technology Research Center for Red Soil Improvement Red Soil Ecological Experiment Station Chinese Academy of Sciences Yingtan335211 China University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China

Revegetation success plays an important role in mine site rehabilitation and environmental management. The process of ion-type rare earths ore leaching would induce NH4+ remaining and affects plants growth in the mining area. In this study, the toxicological effects and potential toxicity thresholds of increasing soil NH4+ concentrations on the growth (14 indicators) of ryegrass (lolium perenne l.) and alfalfa (Medicago sativa l.) were investigated by dose-response models. The results show that high NH4+ concentration not only reduces the plant biomass and soluble sugars in leaves but also increases the H2O2 and MDA content, and SOD, POD, and GPX activities in roots. The SOD activities and root dry weight can be adopted as the most NH4+ sensitive biomarkers. Six ecotoxicological endpoints (root dry weight, soluble sugars, proline, H2O2, MDA, and GSH) of ryegrass, eight ecotoxicological endpoints (root dry weight, soluble sugars, proline, MDA, SOD, POD, GPX, and GSH) of alfalfa were selected to determine the thresholds concentrations, indicating that toxicity thresholds of NH4+ concentrations were proposed as 171.9 (EC5), 207.8 (EC10), 286.6 (EC25), 382.3 (EC50) mg kg−1 for ryegrass, and 171.9 (EC5), 193.2 (EC10), 234.7 (EC25), 289.6 (EC50) mg kg−1 for alfalfa. The obtained information on toxicity thresholds and the relation between plant physiological indicators and NH4+ concentrations may be used to assess the suitability of the investigated plants for ecological restoration strategies. © 2022, The Authors. All rights reserved.

关键词： Toxicity

来源：评论

学校读者我要写书评

暂无评论

Simulating runoff generation and its spatial correlation with environmental factors in Sancha River Basin:The southern source of the Wujiang River

引用

Journal of Geographical Sciences 2019年第3期29卷 432-448页

作者： HOU Wenjuan GAO Jiangbo Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research CAS

Runoff generation is an important part of water retention service, and also plays an important role on soil and water retention. Under the background of the ecosystem degradation, which was caused by the vulnerable karst ecosystem combined with human activity, it is necessary to understand the spatial pattern and impact factors of runoff generation in the karst region. The typical karst peak-cluster depression basin was selected as the study area. And the calibrated and verified Soil and Water Assessment Tool (SWAT) was the main techniques to simulate the runoff generation in the typical karst basin. Further, the spatial variability of total/surface/groundwater runoff was analyzed along with the methods of gradient analysis and local regression. Results indicated that the law of spatial difference was obvious, and the total runoff coefficients were 70.0%. The groundwater runoff was rich, about 2–3 times the surface runoff. Terrain is a significant factor contributing to macroscopic control effect on the runoff service, where the total and groundwater runoff increased significantly with the rising elevation and slope. The distribution characteristics of vegetation have great effects on surface runoff. There were spatial differences between the forest land in the upstream and orchard land in the downstream, in turn the surface runoff presented a turning point due to the influence of vegetation. Moreover, the results of spatial overlay analysis showed that the highest value of total and groundwater runoff was distributed in the forest land. It is not only owing to the stronger soil water retention capacity of forest ecosystem, and geologic feature of rapid infiltration in this region, but also reflected the combining effects on the land cover types and topographical features. Overall, this study will promote the development and innovation of ecosystem services fields in the karst region, and further provide a theoretical foundation for ecosystem restoration and reconst

关键词： runoff generation SWAT spatial variation impact factors karst ecosystem

来源：评论

学校读者我要写书评

暂无评论

Predicting the Impact of Climate Change on Vulnerable Species in Gandaki River Basin,Central Himalayas

引用

Journal of Resources and Ecology 2022年第2期13卷 173-185页

作者： Raju RAI ZHANG Yili lIU linshan Paras Bikram SINGH Basanta PAUDEl Bipin Kumar ACHARYA Narendra Raj KHANAl Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Kathmandu Center for Research and Education Chinese Academy of Sciences-Tribhuvan UniversityKathmandu 44613Nepal Guangdong Key Laboratory of Animal Conservation and Resource Utilization Guangdong Public Laboratory of Wild Animal Conservation and UtilizationInstitute of ZoologyGuangdong Academy of ScienceGuangzhou 510260China Biodiversity Conservation Society Nepal Lalitpur 44700Nepal Department of Epidemiology School of Public HealthSun Yat-Sen UniversityGuangzhou 510275China

Gandaki River Basin(GRB)is an important part of the central Himalayan region,which provides habitat for numerous wild ***,climatic changes are making the habitat in this basin more *** paper aims to assess the potential impacts of climate change on the spatial distributions of habitat changes for two vulnerable species,Himalayan black bear(Ursus thibetanus laniger)and common leopard(Panthera pardus fusca),using the maximum entropy(Max Ent)species distribution *** occurrence locations were used along with several bioclimatic and topographic variables(elevation,slope and aspect)to fit the model and predict the potential distributions(current and future)of the *** results show that the highly suitable area of Himalayan black bear within the GRB currently encompasses around 1642 km^(2)(5.01%area of the basin),which is predicted to increase by 51 km^(2) in the future(2050).Similarly,the habitat of common leopard is estimated as 3999 km^(2)(12.19%of the GRB area),which is likely to increase to 4806 km^(2) in ***,the habitat of Himalayan black bear is predicted to increase in the eastern part(Baseri,Tatopani and north from Bhainse)and to decrease in the eastern(Somdang,Chhekampar),western(Burtibang and Bobang)and northern(Sangboche,Manang,Chhekampar)parts of the study ***,the habitat of common leopard is projected to decrease particularly in the eastern,western and southern parts of the basin,although it is estimated to be extended in the southeastern(Bhainse),western(Harichaur and northern Sandhikhark)and north-western(Sangboche)parts of the *** determine the habitat impact,the environmental variables such as elevation,Bio 15(precipitation seasonality)and Bio 16(precipitation of wettest quarter)highly contribute to habitat change of Himalayan black bear;while Bio 13(precipitation of wettest month)and Bio 15 are the main contributors for common ***,this study predicted that the suitable habita

关键词： climate change habitat change Himalayan black bear(Ursus thibetanus laniger) common leopard(Panthera pardus fusca) Gandaki River Basin

来源：评论

学校读者我要写书评

暂无评论

Global Future Population Exposure to Heatwaves

SSRN

引用

SSRN 2023年

作者： Wang, Yuwei Zhao, Na Yin, Xiaozhe Wu, Chaoyang Chen, Mingxing Jiao, Yimeng Yue, Tianxiang State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing100101 China Jiangsu Center for Collaborative Innovation in Geographic Information Resource Development and Application Nanjing210023 China Department of Environmental Health Harvard T.H. Chan School of Public Health BostonMA United States Key Laboratory of Land Surface Pattern and Simulation Institute Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China

The increasing exposure to extreme heatwaves in urban areas from both climate change and the urban heat island (UHI) effect is posing multiple threats and challenges to human society. Despite a growing number of studies focusing on extreme exposure, research advances are still limited in some aspects like oversimplifies of some inter-individual factors of human exposure, resulting in unreliable and unrealistic estimates of future results. In addition, little research performed comprehensive and fine-resolution global analysis in future scenarios. In this study, we present the first global fine-resolution projection of future changing urban population exposure to heatwaves by 2100 under four shared socioeconomic pathways (SSPs) by considering the urban development at global, regional, and national scales. Overall, global urban population exposure to heatwaves is rising under the four SSPs. Temperate and tropical zones predictably have the greatest exposure among all climate zones. Coastal cities are projected to have the greatest exposure, followed closely by cities at low altitudes. Middle-income countries have the lowest exposure and the lowest inequality of exposure among countries. Individual climate effects contributed the most (about 46.4%) to future changes in exposure, followed by the interactive effect between climate and urbanization (about 18.5%). Our results indicate that more attention needs to be paid to policy improvements and sustainable development planning of global coastal cities and some low-altitude cities, especially in low- and high-income countries. Meanwhile, this study also highlights the impact of continued future urban expansion on population exposure to heatwaves. © 2023, The Authors. All rights reserved.

关键词： Climate change

来源：评论

学校读者我要写书评

暂无评论

Evaluation of multidecadal and longer-term temperature changes since 850 CE based on Northern Hemisphere proxy-based reconstructions and model simulations

引用

Science China Earth Sciences 2020年第8期63卷 1126-1143页

作者： Jianglin WANG Bao YANG Jingyun ZHENG Xuezhen ZHANG Zhiyuan WANG Miao FANG Feng SHI Jingjing lIU Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of SciencesBeijing 100101China Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100049China College of Geography and Environmental Science Zhejiang Normal UniversityJinhua 321004China Northwest Institute of Eco-Environment and Resource Chinese Academy of SciencesLanzhou 730000China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China CAS Center for Excellence in Life and Paleoenvironment Beijing 100044China

The temperature variability over multidecadal and longer timescales(e.g., the cold epochs in the late 15 th, 17 th, and early 19 th centuries) is significant and dominant in the millennium-long, large-scale reconstructions and model simulations;however, their temporal patterns in the reconstructed and simulated temperature series are not well understood and require a detailed assessment and comparison. Here, we compare the reconstructed and simulated temperature series for the Northern Hemisphere(NH) at multidecadal and longer-term timescales(>30 years) by evaluating their covariance, climate sensitivity and amplitude of temperature changes. We found that covariances between different reconstructions or between reconstructions and simulations are generally high for the whole period of 850–1999 CE, due to their similar long-term temporal patterns. However,covariances between different reconstructions or between reconstructions and simulations steadily decline as time series extends further back in time, becoming particularly small during Medieval times. This is related to the large uncetainties in the reconstructions caused by the decreased number of proxy records and sample duplication during the pre-instrumental *** based solely on tree-ring data show higher skill than multiproxy reconstructions in capturing the amplitude of volcanic cooling simulated by models. Meanwhile, climate models have a shorter recovery(i.e., lag) in response to the cooling caused by volcanic eruptions and solar activity minima, implying the lack of some important feedback mechanisms between external forcing and internal climate processes in climate models. Amplitudes of temperature variations in the latest published tree-ring reconstructions are comparable to those of the multiproxy reconstructions. We found that the temperature difference between the Medieval Climate Anomaly(950–1250 CE) and the little Ice Age(1450–1850 CE) is generally larger in proxybased reconstruct

关键词： Temperature changes Multidecadal and longer-term variability Northern Hemisphere last millennium

来源：评论

学校读者我要写书评

暂无评论

Pollen-based Holocene quantitative temperature reconstruction on the eastern Tibetan Plateau using a comprehensive method framework

引用

Science China Earth Sciences 2020年第8期63卷 1144-1160页

作者： Chen lIANG Yan ZHAO Feng QIN Zhuo ZHENG Xiayun XIAO Chunmei MA Huan lI Wenwei ZHAO Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Department of Earth Science Sun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography&LimnologyChinese Academy of SciencesNanjing 210008China School of Geography and Ocean Science Nanjing UniversityNanjing 210023China Department of Earth Sciences Vrije Universiteit AmsterdamAmsterdam 1081 HVThe Netherlands School of Geographic Science Nantong UniversityNantong 226009China

Quantitative climate reconstruction on long timescales can provide important insights for understanding the climate variability and providing valuable data for simulations. Unfortunately, the credibility of some attempts was hampered by incomplete reconstruction procedures. We here establish a comprehensive framework resting on high-quality Chinese modern pollen database, including modern pollen data screening, calibration set selection, major climate factor analysis, appropriate model selection, strict statistical assessment of results and ecological interpretation. The application of this framework to three high-resolution pollen records from the eastern Tibetan Plateau allows accurate quantitative inferences of Holocene temperature changes, which is the major control of regional vegetation. The results show that the mean warmest month temperature(MTwa)during the early Holocene was ca. 10.4℃ and reached the highest value at 8.5–6 ka BP(ca. 11℃). The early and mid-Holocene(11–5 ka BP) warmth was followed by 1.2℃ temperature decrease, culminating in the coolest temperatures of the Holocene during the Neoglacial cooling. Superimposing on the general cooling trend, MTwareveals a significant 500-yr periodicity with varying intensities through time, showing that warm(cold) intervals are in phase with solar maxima(minima) periods. This spectral similarity indicates a possible connection of multi-century scale climate fluctuations with solar forcing.

关键词： Approach framework of quantitative reconstruction Tibetan Plateau Holocene Temperature changes Periodicity

来源：评论

学校读者我要写书评

暂无评论

Factors Influencing the Spatial Distribution and Individual Variation in Urinary Fluoride levels in Tibet, China

SSRN

引用

SSRN 2022年

作者： Zhang, Ru Yang, Yi Deji, Yangzong li, Hairong li, Yonghua Nima, Cangjue Zhao, Shengcheng Gong, Hongqiang Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China University of Chinese Academy of Sciences Beijing100049 China Tibet Center of Disease Control and Prevention Lhasa850030 China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences 11 A Datun Road Beijing100101 China

Fluorosis is the most prevalent endemic disease in Tibet and raises public health concern, and urinary fluoride is considered to be a diagnostic indicator of endemic fluorosis. However, the spatial distribution and potential factors influencing the spatial distribution of urinary fluoride remain unclear. The differences in urinary fluoride levels are potentially due to physical environment factors (altitude, water fluoride levels, average annual temperature, average annual precipitation, topographic wetness index and normalized-difference vegetation index) and socioeconomic factors (gender, age, education level, occupation, and annual household income), as ascertained with geographically weighted regression (GWR), analyses of variance (ANOVAs), Geodetector, and stepwise multiple linear regression (MlR). The urinary fluoride levels in Tibet ranged from 0.06 to 9.55 mg·l-1, with a mean value of 1.62 mg·l-1, exceeding the normal value for adult urinary fluoride in China (1.6 mg·l-1). Water fluoride was significantly positively correlated with urinary fluoride levels (P © 2022, The Authors. All rights reserved.

关键词： Diagnosis

来源：评论

学校读者我要写书评

暂无评论

Uncovering the large increases of thermal units during crop phenological phases in China since 1981

引用

European Journal of Agronomy 2025年 170卷

作者： Ermei Zhang Yujie liu Jie Zhang Zhaoyang Shi Shuyuan Huang Junjie liu Tao Pan 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 Department of Earth System Science Ministry of Education Key Laboratory for Earth System Modeling Institute for Global Change Studies Tsinghua University Beijing 100084 China

Thermal unit (TU) is a critical genetic trait of crops and parameter in crop models. Understanding changes in TU is essential to better comprehend climate adaptation and enhance crop model simulations. However, trends in the field TU at a large scale remain largely unknown and lead to traditional crop modeling framework assuming a fixed TU. Here, using the records for multiple crop (wheat, rice and maize) phenological dates and varieties at 206 agro-meteorological stations across China from 1981 to 2018, we found that (1) the number of varieties on average reached 10 for spring wheat, 14 for winter wheat, 18 for early rice, 17 for single rice, 16 for late rice, 11 for spring maize, 13 for summer maize and 17 for interplanting maize from 1981 to 2018 across China, respectively. (2) TU of these successively replaced varieties during the whole growing period significantly ( P  < 0.05) increased by 5.68, 2.44, 2.48, 2.38, 1.67, 5.31, 1.16, 3.78 °C d/a for spring wheat, winter wheat, early rice, single rice, late rice, spring maize, summer maize and interplanting maize across China, respectively. (3) The significantly positive correlations ( R > 0.40, P  < 0.01) between mean temperature and TU during the whole growing period for wheat, rice and maize were found. This observation-based evidence assists breeders in keeping pace with climate change to ensure food security and supports global crop model development.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Spatial variability and long-term change in pollen diversity in Nam Co catchment(central Tibetan Plateau): Implications for alpine vegetation restoration from a paleoecological perspective

引用

Science China Earth Sciences 2018年第3期61卷 270-284页

作者： lI Quan Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

Pollen diversity offers abundant clues into the floristic diversity and history of vegetation change. Few palynological studies investigated modem pollen diversity or the past floristic diversity on the Tibetan Plateau （TP）. Based on modem pollen assemblages from 37 topsoils and 63 surface lake sediments in the Nam Co catchment on the central TP, this study quantitatively explored spatial distribution of modem pollen diversity using Shannon-Wiener index （H） and palynological richness （E（Tn）, n=600）. Pollen diversity indices showed spatial variability among vegetation types, reflecting the differences in terrestrial floristic diversity in the lake catchment. Their values were high in the southeastern region of the lake catchment which is covered by alpine steppe, while values were low for alpine meadow and marsh meadow. The pollen diversity in lacustrine pollen assemblage could be an effective proxy to document past floristic diversity. The past floristic diversity in the lake catchment, recovered from a fossil pollen record ofNMlC-1, showed a long-term change of ascending overlaid by several rapid diversity changes during the last 8400 years due to the downward shift of altitudinal vegetation belt driven by a general climatic cooling. The results imply that under the environmental challenge of climate warming and vegetation degradation, alpine vegetation restoration in the Nam Co catchment and the central TP should pay attention to altitudinal vegetation belt and zonal vegetation of alpine steppe, and use the long-term change of floristic diversity as a historical analogue.

关键词： Pollen diversity Palynological richness Vegetation restoration Nam Co lake Tibetan Plateau

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：