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Response of ecosystem carbon storage to land use change from 1985 to 2050 in the ningxia Section of Yellow River Basin,China

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Journal of Arid land 2024年第1期16卷 110-130页

作者： LIN Yanmin HU Zhirui LI Wenhui CHEN Haonan WANG Fang NAN Xiongxiong YANG Xuelong ZHANG Wenjun College of Geographical Sciences and Planning Ningxia UniversityYinchuan 750021China China-Arab Joint International Research Laboratory for Featured resources and Environmental Governance in Arid Region Yinchuan 750021China ningxia land resources surveying and monitoring institute Yinchuan 750002China State Key Laboratory of Efficient Production of Forest resources Yinchuan 750002China ningxia Lingwu Baijitan National Nature Reserve Administration Yinchuan 751400China

Regional sustainable development necessitates a holistic understanding of spatiotemporal variations in ecosystem carbon storage(ECS),particularly in ecologically sensitive areas with arid and semi-arid *** this study,we calculated the ECS in the ningxia Section of Yellow River Basin,China from 1985 to 2020 using the Integrated Valuation of Ecosystem Services and Tradeoffs(InVEST)model based on land use *** further predicted the spatial distribution of ECS in 2050 under four land use scenarios:natural development scenario(NDS),ecological protection scenario(EPS),cultivated land protection scenario(CPS),and urban development scenario(UDS)using the patch-generating land use simulation(PLUS)model,and quantified the influences of natural and human factors on the spatial differentiation of ECS using the geographical detector(Geodetector).Results showed that the total ECS of the study area initially increased from 1985 until reaching a peak at 402.36×10^(6) t in 2010,followed by a decreasing trend to *** spatial distribution of ECS was characterized by high values in the eastern and southern parts of the study area,and low values in the western and northern *** 1985 and 2020,land use changes occurred mainly through the expansion of cultivated land,woodland,and construction land at the expense of unused *** total ECS in 2050 under different land use scenarios(ranked as EPS>CPS>NDS>UDS)would be lower than that in *** light was the largest contributor to the spatial differentiation of ECS,with soil type and annual mean temperature being the major natural driving *** of this study could provide guidance on the ecological construction and high-quality development in arid and semi-arid areas.

关键词： carbon storage land use change nighttime light Integrated Valuation of Ecosystem Services and Tradeoffs(InVEST)model patch-generating land use simulation(PLUS)model geographical detector(Geodetector) Yellow River Basin

Unsupervised change detection of man-made objects using coherent and incoherent features of multi-temporal SAR images

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Journal of Systems Engineering and Electronics 2022年第4期33卷 896-906页

作者： FENG Hao WU Jianzhong ZHANG Lu LIAO Mingsheng State Key Laboratory of Information Engineering in surveying Mapping and Remote SensingWuhan UniversityWuhan 430079China Key Laboratory of land Subsidence monitoring and Prevention Ministry of Land and ResourcesShanghai 200072China Shanghai Engineering Research Center of land Subsidence Shanghai 200072China Shanghai institute of Geological Survey Shanghai 200072China

Constrained by complex imaging mechanism and extraordinary visual appearance,change detection with synthetic aperture radar(SAR)images has been a difficult research topic,especially in urban *** existing studies have extended from bi-temporal data pair to multi-temporal datasets to derive more plentiful information,there are still two problems to be solved in practical ***,change indicators constructed from incoherent feature only cannot characterize the change objects ***,the results of pixel-level methods are usually presented in the form of the noisy binary map,making the spatial change not intuitive and the temporal change of a single pixel *** this study,we propose an unsupervised man-made objects change detection framework using both coherent and incoherent features derived from multi-temporal SAR *** coefficients of variation in timeseries incoherent features and the man-made object index(MOI)defined with coherent features are first combined to identify the initial change ***,an improved spatiotemporal clustering algorithm is developed based on density-based spatial clustering of applications with noise(DBSCAN)and dynamic time warping(DTW),which can transform the initial results into noiseless object-level patches,and take the cluster center as a representative of the man-made object to determine the change pattern of each *** experiment with a stack of 10 TerraSAR-X images in Stripmap mode demonstrated that this method is effective in urban scenes and has the potential applicability to wide area change detection.

关键词： change detection multi-temporal synthetic aperture radar(SAR)data coherent and incoherent features clustering

Soil Enzyme Activities on Eroded Slopes in the Sichuan Basin, China

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Pedosphere 2015年第4期25卷 489-500页

作者： NIE Xiaojun ZHANG Jianhui GAO Han land Research Integrated monitoring and Sustainable Utilization in Central China Field Science Observation & Research Base of the Ministry of Land and Resources of China School of Surveying and Land Information Engineering Henan Polytechnic University Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and Environment Chinese Academy of Sciences

Determining how soil erosion affects enzyme activity may enhance our understanding of soil degradation on eroded agricultural landscapes. This study assessed the changes in enzyme activity with slope position and erosion type by selecting water and tillage erosion-dominated slopes and performing analyses using the 1376s technique. The 137Cs data revealed that soil loss occurred in the upper section of the two eroded slope types, while soil accumulation occurred in the lower section. The invertase activity increased downslope and exhibited a pattern similar to the 137Cs data. The spatial patterns of urease and alkaline phosphatase activities were similar to the 137Cs inventories on the water and tillage erosion-dominated slopes, respectively. On both the eroded slope types, the invertase activity and soil organic carbon content were correlated, but no correlation was observed between the alkaline phosphatase activity and total phosphorus content. Nevertheless, the urease activity was correlated with the total nitrogen content only on the water erosion-dominated slopes. The enzyme activity-to-microbial biomass carbon ratios indicated high activities of invertase and urease but low activity of phosphatase on the water erosion-dominated slopes compared with the tillage erosion-dominated slopes. Both the invertase activity and the invertase activity-to-microbial biomass carbon ratio varied with the slope position. Changes in the urease activity-to-microbial biomass carbon ratio were significantly affected by the erosion type. These suggested that the dynamics of the invertase activity were linked to soil redistribution on the two eroded slope types, whereas the dynamics of the urease and alkaline phosphatase activities were associated with soil redistribution only on the water or tillage erosion-dominated slopes, respectively. The erosion type had an obvious effect on the activities of invertase, urease and alkaline phosphatase. Soil redistribution might influence the in

关键词： 137Cs technique microbial biomass C N cycle P cycle soil organic C soil redistribution tillage erosion water erosion

Volunteered remote sensing data generation with air passengers as sensors

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International Journal of Digital Earth 2021年第2期14卷 158-180页

作者： Chisheng Wang Yongquan Wang Leyang Wang Zhongwen Hu Shaobiao Zhang Shuanglong Wang Wenqun Xiu Hongxing Cui Dan Wang Qingquan Li Key Laboratory for Geo-Environmental monitoring of Great Bay Area Ministry of Land and ResourcesShenzhen UniversityShenzhenPeople’s Republic of China Key Laboratory of Urban land resources monitoring and Simulation Ministry of Land and ResourcesShenzhenPeople’s Republic of China Faculty of Geomatics East China University of TechnologyNanchangPeople’s Republic of China Shenzhen Urban Public Safety and Technology institute ShenzhenPeople’s Republic of China Shenzhen Integrated Geotechnical Investigation&surveying Co.Ltd ShenzhenPeople’s Republic of China

Remote sensing satellites are playing very important roles in diverse earth observation ***,long revisit period,high cost and dense cloud cover have been the main limitations of satellite remote sensing for a long *** paper introduces the novel volunteered passenger aircraft remote sensing(VPARS)concept,which can partly overcome these *** obtaining aerial imaging data from passengers using a portable smartphone on a passenger aircraft,it has various advantages including low cost,high revisit,dense coverage,and partial anti-cloud,which can well complement conventional remote sensing *** paper examines the concept of VPARS and give general data processing framework of *** cases were given to validate this processing *** preliminary applications on land cover classification and economic activity monitoring validate the applicability of the VPARS ***,we examine the issues about data maintenance,potential applications,limitations and *** conclude the VPARS can benefit both scientific and industrial communities who rely on remote sensing data.

关键词： Volunteered geographic information remote sensing handheld cameras passenger aircraft

Integrating urban morphology and land surface temperature characteristics for urban functional area classification

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Geo-Spatial Information Science 2022年第2期25卷 337-352页

作者： Bin Li Yefei Liu Hanfa Xing Yuan Meng Guang Yang Xiaoding Liu Yaolong Zhao College of Geography and Environment Shandong Normal UniversityJinanChina Beidou Research institute Faculty Of EngineeringSouth China Normal UniversityFoShanChina School of Geography South China Normal UniversityGuangzhouChina Key Laboratory of Natural resources monitoring in Tropical and Subtropical Area of South China Ministry of Natural ResourcesGuangzhouChina Department of land surveying and Geo-Informatics The Hong Kong Polytechnic UniversityHong KongChina institute of surveying and Mapping Department of Natural Resources of Guangdong ProvinceGuangzhouChina

The classification of urban functional areas plays an important role in urban planning and resource *** previous studies have confirmed that different urban func-tional areas have different morphological structures and land Surface Temperature(LST)characteristics,these two types of characteristics have rarely been fully integrated and used for functional area *** this paper,a new framework for classifying urban functional areas is proposed by combining urban morphological features and LST ***,metrics are constructed from three levels,namely,building,road and region,which are used to portray urban morphology;LST is retrieved using thermal infrared remote sensing to reflect LST features with four metrics:the average temperature,maximum temperature,temperature difference and standard deviation of ***,the functional areas are classified into four categories:service/public land,commercial land,residential land and industrial land.A random forest algorithm is used to effectively fuse the features of these two categories and classify the functional *** effectiveness of the proposed framework is tested in the study area of Shenzhen City,Guangdong *** results show that the combined classification accuracy of the proposed classification method is 0.85,which is 0.26 higher than that of the classification model based on urban morphology and 0.1 higher than that of the classification model based on LST *** proposed framework verifies that the integration of LST features into urban functional area classification is reliable and effectively combines urban morphology and LST features for functional area classification.

关键词： Urban function classification urban morphology random forest land Surface Temperature(LST)

Climate effects on an inland alpine lake in Xinjiang, China over the past 40 years

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Journal of Arid land 2013年第2期5卷 188-198页

作者： HuiXia CHAI WeiMing CHENG ChengHu ZHOU ShangMin ZHAO HaiJiang LIU State Key Laboratory of resources and Environmental Information System Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Department of surveying Mapping College of Mining Technology Taiyuan University of Technology China National Environmental monitoring Center

Inland lakes are important water resources in arid and semiarid regions. Understanding climate effects on these lakes is critical to accurately evaluate the dynamic changes of water resources. This study focused on the changes in Sayram Lake of Xinjiang, China, and addressed the effects of climate fluctuations on the inland lake based on long-term sequenced remote sensing images and meteorological data from the past 40 years. A geo- graphic information system （GIS） method was used to obtain the hypsometry of the basin area of Sayram Lake, and estimation methods for evaporation from rising temperature and water levels from increasing precipitation were proposed. Results showed that：（1）Areal values of Sayram Lake have increased over the past 40 years. （2） Both temperature and precipitation have increased with average increases of more than 1.8~C and 82 mm, respectively. Variation of the water levels in the lake was consistent with local climate changes, and the areal values show linear relationships with local temperature and precipitation data. （3） According to the hypsometry data of the basin area, the estimated lake water levels increased by 2.8 m, and the water volume increased by 12.9×108 m3 over the past 40 years. The increasing area of Sayram Lake correlated with local and regional climatic changes because it is hardly affected by human activities.

关键词： Sayram Lake climate change water body extraction areal variation inland alpine lake

QSPR Studies on the Physicochemical Properties of Polychlorinated Diphenyl Sulfides——The Application of Theoretical Descriptors Derived from Electrostatic Potentials on Molecular Surface

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Chinese Journal of Structural Chemistry 2015年第7期34卷 995-1003页

作者：王维许惠英周侣艳唐东跃 Zhejiang surveying institute of Estuary and Coast College of Biology & Environment Engineering Zhejiang Shuren University Hangzhou Environmental monitoring Station

Based on the relationship between the quantitative structure and property（QSPR） of organic compounds, the surface electrostatic potential parameters of 29 polychlorinated diphenyl sulfides（PCDPSs） with experimental values were calculated and extracted, and Multiple Linear Regression（MLR） was used to model the linear relationship between the physicochemical properties（octanol/water partition coefficient, high performance liquid chromatography capacity factor） and molecular structure parameters of PCDPSs. The result shows that the main factors that affect the n-octanol/water partition coefficient and high performance liquid chromatography capacity factor are respectively the number of chlorin atoms substituted on the benzene ring（NCl） and the lowest unoccupied molecular orbital energy（ELUMO）. Secondly, there are also molecular surface electrostatic potentials. This indicates that the molecular surface electrostatic potentials can effectively express the quantitative relationship between the physicochemical properties of PCDPSs and their molecule descriptions. The QSPR models established have strong stability and predictive ability. This also has proved the applicability of molecular surface electrostatic potential parameters in QSPR of PCDPSs.

关键词： polychlorinated diphenyl sulfides(PCDPSs) molecular electrostatic potential physicochemical property QSPR

Decomposing and mapping different scales of land subsidence over Shanghai with X-and C-Band SAR data stacks

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International Journal of Digital Earth 2022年第1期15卷 478-502页

作者： Ru Wang Mengshi Yang Tianliang Yang Jinxin Lin Mingsheng Liao State Key Laboratory of Information Engineering in surveying Mapping and Remote SensingWuhan UniversityWuhanPeople’s Republic of China School of Earth Sciences Yunnan UniversityKunmingPeople’s Republic of China Key Laboratory of land Subsidence monitoring and Prevention Ministry of Land and ResourcesShanghaiPeople’s Republic of China Shanghai institute of Geological Survey ShanghaiPeople’s Republic of China

land subsidence can be observed with time-series of Interferometric Synthetic Aperture Radar(InSAR)***,existing approaches only reveal subsidence signals that are multi-scale mixed,which is not conducive to the systematic analysis of subsidence of different mechanisms.A deformation signal decomposition(DSD)method based on spectral analysis is used to decompose the deformation extracted by time-series InSAR into three classes of deformation *** refer to large-scale deformation related to geological settings,medium-scale deformation caused more by group excavation,and small-scale deformation along linear ***-X datasets for Shanghai spanning April 2013 to September 2020,and Sentinel-1A datasets spanning January 2016 to September 2020 are used in this *** results were cross-verified between the TerraSAR-X and Sentinel-1A datasets,and validated against levelling *** signals caused by different mechanisms were automatically decomposed,which facilitates a systematic analysis for targeted diagnosis of land subsidence signals.A detailed analysis was conducted jointly at three scales of surface displacement,geological conditions,major construction activities,and subsidence *** indicated that construction activities were the leading cause of land subsidence,and suggests that local authorities that wish to mitigate surface subsidence may benefit from primarily considering this process.

关键词： Deformation decomposition land subsidence time-series InSAR Shanghai

2-D NUMERICAL SIMULATION OF FLOODING EFFECTS CAUSED BY SOUTH-TO-NORTH WATER TRANSFER PROJECT

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Journal of Hydrodynamics 2008年第5期20卷 662-667页

作者： SUN Dong-po XUE Hai WANG Peng-tao LU Rui-li LIAO Xiao- long North China University of Water and Hydroelectric Power Zhengzhou 450011 China institute of Civil and Water Conservancy Ningxia University Yinchuan 750021 China China Pearl River Water resources Planning Designing surveying Co. Ltd. Guangzhou 510610 China

Since the General Channel designed for the South-to-North Water Transfer Project in China has to cross many rivers and streams flowing from west to east, there are potentially serious effects additional flooding on the western side of the project alignment. Therefore, a 2-D numerical model for forecasting basin flood disasters was established and verified using historical flood data. The model was applied to researching the interaction between the proposed Project and flooding events for 5 streams in the Anyang River reach as a representative case study. Simulated results indicate that the model could correctly forecast the flood, submerged area and depths, and water surface elevations along the left side of the channel. The discharge capacity and location of hydraulic structures in the transfer canal alignment were analyzed. Then adjustments to the dimensions and positioning of proposed hydraulic structures were recommended at intersections, especially the addition of a channel to transfer flood water from one stream to another, which can effectively limit the sluice and protect the Anyang City from flooding.

关键词： South-to-North Water Transfer Project 2-D numerical simulation interpenetrating flood field diffiuent canal