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Spatio-temporal correlation between human activity intensity and land surface temperature on the north slope of Tianshan Mountains

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Journal of Geographical Sciences 2022年第10期32卷 1935-1955页

作者： CHEN Hongjin LIU Lin ZHANG Zhengyong LIU Ya TIAN Hao KANG Ziwei WANG Tongxia ZHANG Xueying School of Science Shihezi UniversityShihezi 832000XinjiangChina Key Laboratory of Oasis Town and Mountain-basin System Ecology of Xinjiang Bingtuan Shihezi 832003XinjiangChina

Research on the spatio-temporal correlation between the intensity of human activities and the temperature of earth surfaces is of great significance in many aspects,including fully understanding the causes and mechanisms of climate change,actively adapting to climate change,pursuing rational development,and protecting the ecological *** the north slope of Tianshan Mountains,located in the arid area of northwestern China and extremely sensitive to climate change,as the research area,this study retrieves the surface temperature of the mountain based on MODIS data,while characterizing the intensity of human activities thereby data on the night light,population distribution and land *** evolution characteristics of human activity intensity and surface temperature in the study area from 2000 to 2018 were analyzed,and the spatio-temporal correlation between them was further *** is found that:(1)The average human activity intensity(0.11)in the research area has kept relatively low since this century,and the overall trend has been slowly rising in a stepwise manner(0.0024·a-1);in addition,the increase in human activity intensity has lagged behind that in construction land and population by 1-2 years.(2)The annual average surface temperature in the area is 7.18℃with a pronounced *** rate of change(0.02℃·a-1)is about 2.33 times that of the *** striking boost in spring(0.068℃·a-1)contributes the most to the overall warming ***,the surface temperature is low in the south and high in the north,due to the prominent influence of the underlying surface characteristics,such as elevation and vegetation coverage.(3)The intensity of human activity and the surface temperature are remarkably positively correlated in the human activity areas there,showing a strong distribution in the east section and a weak one in the west *** expression of its spatial differentiation and correlation is comprehensively affected by such factors as

关键词： human activity intensity surface temperature nighttime light data spatio-temporal correlation north slope of Tianshan Mountains

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Identifying the spatio-temporal variability of human activity intensity and associated drivers: a case study on the Tibetan Plateau

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Frontiers of Earth Science 2022年第3期16卷 744-756页

作者： Cai LIU Haiyan ZHANG Fuping GAN Yunge LU Hao WANG Jiahong ZHANG Xing JU College of Earth Sciences Chengdu University of TechnologyChengdu 610059China Key Laboratory of Airborne Geophysics and Remote Sensing Geology(Ministry of Nature Resources) Beijing 100083China China Aero Geophysical Survey and Remote Sensing Center for Natural Resources Beijing 100083China Institute of Geographical Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China

human activities have significantly degraded ecosystems and their associated *** understanding the spatio-temporal variability and drivers of human activity intensity(HAI),we can better evaluate the interactions between human and terrestrial ecosystems,which is essential for land-use related decision making and eco-environmental *** the“third pole,”the Tibetan Plateau(TP)plays a strong role in shaping the global environment,and acts as an important ecological security barrier for *** on land-use/cover change data,environmental geographic data,and socioeconomic data,we adopted a method for converting different land use/cover types into construction land equivalent to calculate the HAI value and applied the Getis-Ord Gi*statistic to analyze the spatio-temporal dynamics associated with HAI since 1980 on the ***,we explored the forces driving the HAI changes using GeoDetector software and a correlation *** main conclusions are as follows:It was observed that HAI increased slowly from 3.52%to 3.65%during the 1980-2020 period,with notable increases in the western part of the Qaidam Basin and Hehuang ***,HAI was associated with a significant agglomeration effect,which was mainly concentrated in the regions of the Yarlung Zangbo and Yellow-Huangshui *** natural and anthropogenic factors were identified as important driving forces behind the spatial changes in HAI,of which soil type,gross domestic product,and population density had the greatest ***,the temporal changes in HAI were largely driven by economic *** information provides crucial guidance for territory development planning and ecological-protection policy decisions.

关键词： Tibetan Plateau human activity intensity GeoDetector spatio-temporal variability driving factors

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human activity intensity of land surface: Concept, methods and application in China

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Journal of Geographical Sciences 2016年第9期26卷 1349-1361页

作者：徐勇徐小任汤青 Institute of Geographic Sciences and Natural Resources Research CAS University of Chinese Academy of Sciences

human activity intensity is a synthesis index for describing the effects and influences of human activities on land surface. This paper presents the concept of human activity intensity of land surface and construction land equivalent, builds an algorithm model for human activity intensity, and establishes a method for converting different land use/cover types into construction land equivalent as well. An application in China based on the land use data from 1984 to 2008 is also included. The results show that China＇s human activity intensity rose slowly before 2000, while rapidly after 2000. It experienced an increase from 7.63% in 1984 to 8.54% in 2008. It could be generally divided into five levels： Very High, High, Medium, Low, and Very Low, according to the human activity intensity at county level in 2008, which is rated by above 27%, 16%-27%, 10%-16%, 6%-10%, and below 6%. China＇s human activity intensity was spatially split into eastern and western parts by the line of Helan Mountains-Longmen Mountains-Jinghong. The eastern part was characterized by the levels of Very High, High, and Medium, and the levels of Low and Very Low were zonally distributed in the mountainous and hilly areas. In contrast, the western part was featured by the Low and Very Low levels, and the levels of Medium and High were scattered in Gansu Hexi Corridor, the east of Qinghai, and the northern and southern slopes of Tianshan Mountains in Xinjiang.

关键词： human activity intensity land surface construction land equivalent land use/cover types China

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Assessing the dynamics of human activity intensity and its natural and socioeconomic determinants in Qinghai-Tibet Plateau

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Geography and Sustainability 2023年第4期4卷 294-304页

作者： Hanchu Liu Jie Fan Kan Zhou Xin Xu Haipeng Zhang Rui Guo Shaofeng Chen Institutes of Science and Development Chinese Academy of SciencesBeijing 100190China Institute of Geography Science and Natural Resources Research Chinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China College of Resources Environment&TourismCapital Normal UniversityBeijing 100048China

Investigating the spatiotemporal variation of human activity intensity and its determinants is a crucial basis for further revealing the mechanism of human-environment interaction and optimizing the human development *** this study,the human activity intensity on the Qinghai-Tibet Plateau(QTP)from 1990 to 2020 was measured based on the quantitative model of land use data and the actual regional background,and the under-lying natural and socioeconomic determinants were investigated using spatial econometric *** results demonstrate that(1)the human activity intensity in QTP has increased by 11.96%,and there are differences in different spatial scales;the areas with high human activity intensity are distributed in the Hehuang Valley where Xining City and its surrounding areas are located,as well as the One-River and Two-River Area where Lhasa City and surrounding areas are located.(2)human activity intensity has significant positive spatial spillover,suggesting that local changes will cause changes in the same direction in adjacent areas.(3)The human activ-ity intensity in QTP is affected by various *** socioeconomic factors,the economic level has no significant impact on the human activity intensity in QTP,which differs from the general regional *** urbanization and traffic conditions have a significant positive effect,and the impact intensity continues to *** natural factors,topographic relief has a significant positive effect;the impacts of temper-ature and vegetation coverage have changed from insignificant to a significant positive effect;the impacts of precipitation and river network density have not been verified;there is no linear relationship between altitude and human activity intensity in the entire QTP,while it exists in local ***,this study proposes three policy implications for the realization of a more harmonious human-environment relationship in QTP.

关键词： human activity intensity Spatiotemporal dynamics Natural and socioeconomic determinants Spatial econometric model Qinghai-Tibet Plateau

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Canopy structure:An intermediate factor regulating grassland diversity-function relationships under human disturbances

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Fundamental Research 2023年第2期3卷 179-187页

作者： Xiaoxia Zhao Yuhao Feng Kexin Xu Mengqi Cao Shuya Hu Qiuli Yang Xiaoqiang Liu Qin Ma Tianyu Hu Maggi Kelly Qinghua Guo Yanjun Su State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences Beijing 100049China Institute of Ecology College of Urban and Environmental SciencePeking UniversityBeijing 100871China Patent Examination Cooperation Sichuan Center of the Patent Office China National Intellectual Property AdministrationChengduSichuan 610213China Department of Environmental Sciences Policy and ManagementUniversity of CaliforniaBerkeleyCA 94720United States Division of Agriculture and Natural Resources University of CaliforniaBerkeleyCA 94720United States Institute of Remote Sensing and Geographical Information Systems School of Earth and Space SciencesPeking UniversityBeijing 100871China

Grasslands are one of the largest coupled human-nature terrestrial ecosystems on Earth,and severe anthropogenic-induced grassland ecosystem function declines have been reported *** factors influencing grassland ecosystem functions is critical for making sustainable management *** structure is an important factor influencing plant growth through mediating within-canopy microclimate(e.g.,light,water,and wind),and it is found coordinating tightly with plant species diversity to influence forest ecosystem ***,the role of canopy structure in regulating grassland ecosystem functions along with plant species diversity has been rarely ***,we investigated this problem by collecting field data from 170 field plots distributed along an over 2000 km transect across the northern agro-pastoral ecotone of *** net primary productivity(ANPP)and resilience,two indicators of grassland ecosystem functions,were measured from field data and satellite remote sensing *** laser scanning data were collected to measure canopy structure(represented by mean height and canopy cover).Our results showed that plant species diversity was positively correlated to canopy structural traits,and negatively correlated to human activity *** structure was a significant indicator for ANPP and resilience,but their correlations were inconsistent under different human activity intensity *** to plant species diversity,canopy structural traits were better indicators for grassland ecosystem functions,especially for *** structure equation modeling analyses,we found that plant species diversity did not have a direct influence on ANPP under human ***,it had a strong indirect effect on ANPP by altering canopy structural *** to resilience,plant species diversity had both a direct positive contribution and an indirect contribution through mediating canopy *** study highlig

关键词： Grassland ecosystem function Canopy structure Plant species diversity human activity intensity Northern agro-pastoral ecotone

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