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Satellite Image-based Monitoring of Urban land Use Change and Assessing the Driving Factors in Pokhara and Bharatpur Metropolitan Cities, Gandaki Basin, Nepal

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Journal of Resources and Ecology 2020年第1期11卷 87-99页

作者： Raju RAI ZHANG Yili Basanta PAUDEL Narendra Raj KHANAL Bipin Kumar ACHARYA 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 Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing 100101China Kathmandu Center for Research and Education Chinese Academy of Sciences-Tribhuvan UniversityKirtipurKathmandu 44613Nepal Department of Epidemiology School of Public HealthSun Yat-Sen UniversityGuangzhou 510275China

Urban growth is a key indicator of economic *** the same time,haphazard urban growth creates serious socioeconomic,environmental and urban land management *** this context,understanding the process of urban landscape change is important for guiding the sustainable growth of urban *** study analyzes the urban land changes during 1990–2018 in two metropolitan cities of Gandaki basin:Pokhara and *** satellite images were analyzed using supervised classification *** results revealed that the built-up area has increased significantly by 300%in Pokhara and by nearly 500%in the Bharatpur during the past 28 *** growth,migration from surrounding areas due to urban facilities and the easy lifestyle in cities were found to be major determinants of urban growth within the study *** addition,the changing urban definition and expansion of municipal boundaries are key factors for rapid urban *** cities are likely to grow in the future as they are both located in areas that encompass the high levels of commercial activity and modern service *** haphazard urban growth should be minimized through planning and policies for sustainable urban development.

关键词： urban land change driving factors Pokhara Bharatpur Gandaki River Basin

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Continuous land cover change monitoring in the remote sensing big data era

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Science China Earth Sciences 2017年第12期60卷 2223-2224页

作者： DONG JinWei KUANG WenHui LIU JiYuan Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

Since the late 20th century,global change issues have attracted lots of *** a key component of global changes,land cover and land use information has been increasingly important for improved understanding of global en... 详细信息

关键词： Continuous lan the remote sensing big data era

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Reconstructing provincial cropland area in eastern China during the early Yuan Dynasty(AD1271–1294)

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Journal of Geographical Sciences 2018年第12期28卷 1994-2006页

作者：李美娇何凡能杨帆李士成 Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research CAS University of Chinese Academy of Sciences School of Public Administration China University of Geosciences

Reconstructing historical land use and land cover change(LUCC) at the regional scale is an important component of global environmental change studies and of improving global historical land use datasets. By analyzing data in historical documents, including military-oriented cropland(hereafter M-cropland) area, the number of households engaged in M-cropland(hereafter M-household) reclamation, cropland area, and the number of households, we propose a conversion relationship between M-cropland area and cropland area reclaimed by each household. A provincial cropland area estimation method for the Yuan Dynasty is described and used to reconstruct the provincial cropland area for AD1290. Major findings are as follows.(1) Both the M-cropland and cropland areas of each household were high in the north and low in the south during the Yuan Dynasty, which resulted from different natural conditions and planting practices. Based on this observation, the government-allocated M-cropland reclamation area to each household was based on the cropland area reclaimed by each household.(2) The conversion relationship between M-cropland and cropland areas per household showed conversion coefficients of 1.23 and 0.65 for the south and north, respectively.(3) The cropland area in the entire study area in AD1290 was 535.4×106 mu(Chinese area unit, 1 mu=666.7 m^2), 57.8% in the north and 42.2% in the south. The fractional cropland areas for the entire study area, north, and south were 6.8%, 6.6%, and 7.1%, respectively and the per capita cropland areas for the whole study area, north, and south were 6.7, 15.6, and 4.1 mu, respectively.(4) Cropland was mainly distributed in the middle and lower reaches of the Yellow River(including the Fuli area), Huaihe River Basin(including Henan Province), and middle and lower reaches of the Yangtze River(including Jiangzhe, Jiangxi, and Huguang provinces).

关键词： historical LUCC cropland area estimation historical documents Yuan Dynasty

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Impact of Ambient Temperature, Precipitation and Seven Years of Experimental Warming and Nutrient Addition on Fruit Production in an Alpine Heath and Meadow Community

SSRN

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SSRN 2021年

作者： Alatalo, Juha M. Dai, Junhu Pandey, Rajiv Erfanian, Mohammad Bagher Ahmed, Talaat Bai, Yang Molau, Ulf Jägerbrand, Annika K. Environmental Science Center Qatar University PO Box 2713 Doha Qatar Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China Division of Forestry Statistics Indian Council of Forestry Research and Education Dehradun India Quantitative Plant Ecology and Biodiversity Research Lab Department of Biology Faculty of Science Ferdowsi University of Mashhad Mashhad Iran Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences Menglun Mengla Yunnan 666303 China Department of Plant and Environmental Sciences University of Gothenburg PO Box 461 GothenburgSE- 405 30 Sweden Department of Environmental and Biosciences School of Business Innovation and Sustainability Halmstad University P.O. Box 823 HalmstadSE-301 18 Sweden

Global change is causing changes in temperature, precipitation, and nutrient availability. Alpine and polar regions are predicted to be among the most vulnerable for these changes. We applied a seven-year factorial experiment with warming and nutrient addition in two alpine vegetation communities. We analyzed relationship between fruit production and monthly mean, max and min temperatures during the fall of the pre-fruiting year, fruiting summer, whole fruit production period, and effects of summer and winter precipitation on fruit production. Nutrient addition and combined nutrient addition and warming increased total fruit production, and fruit production of graminoids in the later years in the Heath and Meadow and had a positive effect on forbs in the Meadow. In contrast fruit production of evergreen shrubs were negative affected by all treatments in the Meadow and Heath, while fruit production of deciduous shrubs was negatively affected in the Meadow. Minimum and mean temperatures were more important than max temperatures, and max temperatures of the fall before flowering was more important than max temperature during the flowering year. Winter precipitation had significant effect on total fruit production, fruit production of deciduous shrubs and forbs in the Heath, and on evergreen shrubs and forbs in the Meadow. Increased nutrient availability increased fruit production over time in contrasting high alpine plant communities, while experimental warming had no, or negative effect. Additionally, the results indicate that warmer summers may have limited impact on fruit production of high alpine plants. Instead, max temperatures during the fall before the fruiting year, and minimum temperatures may be more important. © 2021, The Authors. All rights reserved.

关键词： Climate change

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Corrigendum to "Emerging risks of toxic metal(loid)s in soil-vegetables influenced by steel-making activities and isotopic source apportionment" [Environ. Int. 146 (2021) 106207]

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Environment international 2022年 160卷 107087页

作者： Jin Wang Lulu Wang Yuxuan Wang Daniel C W Tsang Xiao Yang Jingzi Beiyuan Meiling Yin Tangfu Xiao Yanjun Jiang Wenli Lin Yuchen Zhou Juan Liu Liang Wang Min Zhao School of Environmental Science and Engineering Key Laboratory of Water Quality and Conservation in the Pearl River Delta Ministry of Education Guangzhou University Guangzhou 510006 China Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources Guangzhou 510006 China. School of Environmental Science and Engineering Key Laboratory of Water Quality and Conservation in the Pearl River Delta Ministry of Education Guangzhou University Guangzhou 510006 China. Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong China. Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China. School of Environment and Chemical Engineering Foshan University Foshan Guangdong China. School of Environmental Science and Engineering Key Laboratory of Water Quality and Conservation in the Pearl River Delta Ministry of Education Guangzhou University Guangzhou 510006 China. Electronic address: liujuan858585@***. Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection College of Resources and Environment Linyi University Linyi China.

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Spatial and temporal change patterns of freeze-thaw erosion in the three-river source region under the stress of climate warming

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Journal of Mountain Science 2017年第6期14卷 1086-1099页

作者： GUO Bing LUO Wei WANG Dong-liang JIANG Lin Shandong University of Technology School of Civil and Architectural Engineering Key Laboratory of Land Surface Pattern and Simulation Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences

The three-river source region(TRSR), located in the Qinghai-Tibet Plateau in China, suffers from serious freeze-thaw(FT) erosion in China. Considering the unique eco-environment and the driving factors of the FT process in the TRSR, we introduce the driving force factors of FT erosion(rainfall erosivity and wind field intensity during FT period) and precipitation during the FT period(indicating the phase-changed water content). The objective was to establish an improved evaluation method of FT erosion in the TRSR. The method has good applicability in the study region with an overall precision of 92%. The spatial and temporal changes of FT erosion from 2000 to 2015 are analyzed. Results show that FT erosion is widely distributed in the TRSR, with slight and mild erosion being the most widely distributed, followed by moderate erosion. Among the three sub-regions, the source region of the Yellow River has the slightest erosion intensity, whereas the erosion intensity of the source region of Yangtze River is the most severe. A slight improvement can be observed in the condition of FTerosion over the whole study region from 2000 to 2015. Vegetation coverage is the dominant factor affecting the intensity of FT erosion in the zones with sparse vegetation or bare land, whereas the climate factors play an important role in high vegetation coverage area. Slopes>28° also have a significant effect on the intensity of FT erosion in the zones. The results can provide a scientific basis for the prevention and management of the soil FT erosion in the TRSR.

关键词： Freeze-thaw erosion Vegetation Precipitation Three-river source region Global warming

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Long-term changes in the tree radial growth and intrinsic water-use efficiency of Chuanxi spruce(Picea likiangensis ***) in southwestern China

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Journal of Geographical Sciences 2018年第6期28卷 833-844页

作者： WANG Yang ZHANG Yong FANG Ouya SHAO Xuemei Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Re-sources ResearchCASBeijing 100101China University of Chinese Academy of Sciences Beijing 100101China State Key Laboratory of Vegetation and Environmental Change Institute of BotanyCASBeijing 100093China

Elevated CO_(2) level in the atmosphere is expected and intrinsic water-use efficiency(iWUE).Although current found the tree growth decline in water-limited area,it is st to improve the tree growth rates results inferring from tree rings unclear whether spruce trees in humid southwestern China benefit from the increasing *** this study,tree-ring width data were used to investigate the tree radial growth rate of Chuanxi spruce(Picea likiangensis ***).Moreover,combining with the tree-ring carbon isotope date,we analyzed the physiological responses of Chuanxi spruce to rising CO_(2) concentrations in the atmosphere(C_(a))associated with climatic change in southwestern *** 1851 to 2009,iWUE of Chuanxi spruce rose by approximately 30.4%,and the ratio of atmospheric CO_(2) to leaf in-tercellular CO_(2) concentration(C_(j)/C_(a))showed no significant trend in the study *** result suggested that Chuanxi spruce used an active response strategy when C_(a) was significantly increased,iWUE showed a significant increasing trend in parallel with tree radial growth,indicating that the increasing iWUE resulted in an increase in radial *** results suggest that spruce forests in southwestern China have not shown declining trends under increasing Ca and climate change scenarios,in contrast to trees growing in water-limited ***,spruce forests benefit from the increasing CO_(2) in the atmosphere in the humid areas of southwestern China.

关键词： tree ring basel area increment carbon isotope intrinsic water-use efficiency C0_(2)fertilization

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Holocene peatland development and vegetation changes in the Zoige Basin, eastern Tibetan Plateau

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Science China Earth Sciences 2017年第10期60卷 1826-1837页

作者： SUN XiaoHong ZHAO Yan LI Quan 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

Peat sediments and peatland evolution process offer abundant clues into the history of vegetation and climate *** order to reconstruct Holocene peatland, vegetation and climate changes on eastern Tibetan Plateau, we conducted analyses of fossil pollen, loss-on-ignition, and carbon accumulation rate on one peat core from Zoige Basin. Our results show local peatland initiated at 10.3 ka, thrived in the early-mid Holocene, and then began to degrade. Throughout the Holocene, Zoige Basin was dominated by alpine meadow. Coniferous forest on montane regions expanded for several times during 10.5–4.6ka, and then dramatically retreated. Results of peatland property, principal component analysis on fossil pollen suggested the climate maintained warm/wet during 10–5.5 ka, and became relatively cold/dry in the late Holocene. Rapid degradation of peatland, retreat of coniferous forest and climatic drought/cooling occurred at 10.2–10, 9.7–9.5, 8.7–8.5, 7.7–7.4, 6.4–6, 5.5–5.2,4.8–4.5, 4–3.6, 3.1–2.7, 1.4–1.2 and 0.8–0.6 ka. The long-term variations of Holocene climate and vegetation on eastern Tibetan Plateau could be attributed to changes in insolation-driven temperature and Asian Summer Monsoon intensity, while those rapid centennial changes were probably triggered by abrupt monsoon failures and temperature anomalies in the high northern latitudes.

关键词： Holocene Climate change Fossil pollen Peatland Tibetan Plateau

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Climate change, migration, and regional administrative reform： A case study of Xinjiang in the middle Qing Dynasty(1760–1884)

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Science China Earth Sciences 2017年第7期60卷 1328-1337页

作者： LI YanPeng GE QuanSheng WANG HuanJiong TAO ZeXing 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

Based on historical records of extreme climate events and population densities in Gansu and Shaanxi, and information on climate change, populations, new cultivated cropland, and administrative system reform in Xinjiang, this study explores the interaction between climate change, migration, and regional administrative reform in the middle Qing Dynasty. The results showed that the surge in population migration from Gansu and Shaanxi to Xinjiang during 1760–1820 was caused by extreme climate events(droughts and floods) and population pressure in Gansu and Shaanxi. During 1760–1880, the climate in Xinjiang was unusually cold and humid, which was highly conducive to abundant regional water resources. This provided favorable conditions for farmland irrigation and further promoted agricultural cultivation, population growth, and town development within this region. Additionally,the interactions between climate change and the above-mentioned social factors, which acted as driving forces, spurred the reform in the administrative system of Xinjiang whereby the military administration system was transformed to a province administration system. Through this reform, the Qing government managed to restore peace and stability in Xinjiang. This study contributes to a better understanding of climate-related population migration and enhances our knowledge of the impact-response chain between climate change, ancient social developments, and political coping strategies, especially in regional administrative reform.

关键词： Climate change Migration Cultivation Regional administrative reform Xinjiang Qing Dynasty

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Spatiotemporal changes in agricultural land cover in Nepal over the last 100 years

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Journal of Geographical Sciences 2018年第10期28卷 1519-1537页

作者： Basanta PAUDEL 张镱锂李士成刘林山 Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources Research CAS University of Chinese Academy of Sciences (UCAS) CAS Center for Excellence in Tibetan Plateau Earth Sciences School of Public Administration China University of Geosciences

In order to advance land use and land cover change（LUCC） research in Nepal, it is essential to reconstruct both the spatiotemporal distribution of agricultural land cover as well as scenarios that can explain these changes at the national and regional levels. Because of rapid population growth, the status of agricultural land in Nepal has changed markedly over the last 100 years. Historical data is used in this study, encompassing soils, populations, climatic variables, and topography. Data were revised to a series of 30 m grid cells utilized for agricultural land suitability and allocation models and were analyzed using a suite of advanced geographical tools. Our reconstructions for the spatiotemporal distribution of agricultural land in Nepal reveal an increasing trend between 1910 and 2010（from 151.2 × 10^2 km^2 to 438.8 × 10^2 km^2）. This expanded rate of increase in agricultural land has varied between different eco, physiographic, and altitudinal regions of the country, significantly driven by population changes and policies over the period of this investigation. The historical dataset presented in this paper fills an existing gap in studies of agricultural land change and can be applied to other carbon cycle and climate modeling studies, as well as to impact assessments of agricultural land change in Nepal.

关键词： agricultural land reconstruction land suitability for cultivation altitudinal variation Nepal

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