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Spatiotemporal Characteristics of Drought in the heihe River Basin Based on the Extreme-Point Symmetric Mode Decomposition Method

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International Journal of Disaster Risk Science 2019年第4期10卷 591-603页

作者： Kai Feng Xiaoling Su College of Water Resources and Architectural Engineering Northwest A&F UniversityYangling 712100China Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas Ministry of EducationNorthwest A&F UniversityYangling 712100China

Assessment of spatiotemporal characteristics of drought under climate change is significant for drought *** this study,the standardized precipitation evapotranspiration index(SPEI)calculated at different timescales was adopted to describe the drought conditions in the heihe River Basin(HRB)from 1961 to *** period characteristics and spatiotemporal distribution of drought were analyzed by using the extreme-point symmetric mode decomposition(ESMD)and inverse distance weight interpolation *** main results were obtained.(1)The SPEI series of the upper reaches of the HRB at different timescales showed an upward trend(not significant)during 1961–*** the middle and lower reaches,the SPEI series exhibited significant downward trends.(2)The annual SPEI series of the lower reaches was decomposed through the ESMD method and exhibited a fluctuating downward trend as a *** oscillation showed quasi-3.4-year and quasi-4.5-year periods in the interannual variation,while a quasi-13.5-year period occurred in the interdecadal *** interannual period plays a leading role in drought variation across the HRB.(3)The entire research period was divided into three subperiods by the Bernaola–Galvan segmentation algorithm:1961–1966,1967–1996,and 1997–*** spring drought frequency and autumn drought intensity arrived at their maxima in the lower reaches during 1997–2014,with values of 72.22%and 1.56,*** high frequency and intensity areas of spring,summer,and autumn drought moved from the middle-upper reaches to the middle-lower reaches of the HRB during 1961–2014.(4)Compared to the wavelet transform,the ESMD method has self-adaptability for signal decomposition and is more accurate for drought period ***-point symmetric mode decomposition is a more efficient decomposition method for nonlinear and nonstationary time series and has important significance for revealing the complicated change features of climate systems.

关键词： China Drought heihe River Basin Spatiotemporal drought analysis

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LAND DESERTIFICATION(DEGRADATION) AND ITS CONTROL IN LOWER REACH REGION OF heihe RIVER

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干旱区资源与环境 1993年第Z1期7卷 63-65页

作者： Chen Longhen Institute of Desert Research, Academia Sinica, Lanzhou, China

The lower reach of heihe River, also known as Ejina River, was called Ruoshui Riverin ancient times. This area, although fallen into extremely arid temperate desert in the EjinaBanner, Inner Mongolia, has been a main line of communication since then and formed thefertile Ejina Oasis relying on the water source flowing from the Qilian mountains. However,in the recent years the land desertification (degradation) in this area has developed rapidly,

关键词： heihe River Lower Reaches Desertification Oasis

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Spatial associations between NDVI and environmental factors in the heihe River Basin

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Journal of Geographical Sciences 2019年第9期29卷 1548-1564页

作者： YUAN Lihua CHEN Xiaoqiang WANG Xiangyu XIONG Zhe SONG Changqing Center for GeoData and Analysis Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Key Laboratory of Climate-Environment for East Asia Institute of Atmospheric PhysicsCASBeijing 100029China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China Key Laboratory of Environmental Change and Natural Disaster Beijing Normal UniversityBeijing 100875China

The heihe River Basin is located in the arid and semi-arid regions of Northwest ***,the terrestrial ecosystem is vulnerable,making it necessary to identify the factors that could affect the *** this study,MODIS-NDVI data with a 250-m resolution were used as a proxy for the terrestrial *** combining these with environmental factors,we were able to explore the spatial features of NDVI and identify the factors influencing the NDVI distribution in the heihe River Basin during the period of 2000–2016.A geographical detector(Geodetector) was employed to examine the spatial heterogeneity of the NDVI and to explore the factors that could potentially influence the NDVI *** results indicate that:(1) the NDVI in the heihe River Basin appeared high in the southeast while being low in the north,showing spatial heterogeneity with a q-statistic of *** spatial trend of the vegetation in the three sub-basins generally increased in the growing seasons from 2000 to 2016;(2) The results obtained by the Geodetector(as denoted by the q-statistic as well as the degree of spatial association between the NDVI and environmental factors) showed spatial heterogeneity in the associations between the NDVI and the environmental factors for the overall basin as well as the *** was the dominant factor for the overall *** the upper basin,elevation was found to be the dominant *** dominant factor in the middle basin was precipitation,closely followed by the soil *** the lower basin,the dominant factor was soil type with a lower q-statistic of 0.13,and the dominant interaction between the elevation and soil type was nonlinearly enhanced(q-statistic = 0.22).

关键词： NDVI environmental factors vegetation Geodetector q-statistic spatial heterogeneity heihe River Basin

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Stability and long-range correlation of air temperature in the heihe River Basin

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Journal of Geographical Sciences 2019年第9期29卷 1462-1474页

作者： YANG Jing SU Kai YE Sijing State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China Key Laboratory of Environmental Change and Natural Disaster Beijing Normal UniversityBeijing 100875China Center for Geodata and Analysis Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China

Air temperature(AT) is a subsystem of a complex ***-range correlation(LRC) is an important feature of *** research attempt to evaluate AT’s complexity differences in different land-use types in the heihe River Basin(HRB) based on the stability and *** results show the following:(1) AT’s stability presents differences in different land-use *** agricultural land,there is no obvious variation in the trend throughout the *** in a desert,the variation in the trend is obvious: the AT is more stable in summer than it is in winter,with Ta ranges of [8,20]°C and SD of the AT residual ranges of [0.2,0.7],***,in mountainous areas,when the altitude is beyond a certain value,AT’s stability changes.(2) AT’s LRC presents differences in different land-use *** agricultural land,the long-range correlation of AT is the most persistent throughout the year,showing the smallest difference between summer and winter,with the Hs range of [0.8,1].Vegetation could be an important *** a desert,the long-range correlation of AT is less persistent,showing the greatest difference between summer and winter,with the Hs range of [0.54,0.96].Solar insolation could be a dominant *** an alpine meadow,the long-range correlation of AT is the least persistent throughout the year,presenting a smaller difference between summer and winter,with the Hs range of [0.6,0.85].Altitude could be an important factor.(3) Usually,LRC is a combination of the Ta and SD of the AT residuals.A larger Ta and smaller SD of the AT residual would be conducive to a more persistent LRC,whereas a smaller Ta and larger SD of the AT residual would limit the persistence of LRC.A larger Ta and SD of the AT residual would create persistence to a degree between those of the first two cases,as would a smaller Ta and SD of the AT *** addition,the last two cases might show the same LRC.

关键词： heihe River Basin air temperature long-range correlation stability geographical environment

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The impact of land use and cover change on soil organic carbon and total nitrogen storage in the heihe River Basin: A meta-analysis

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Journal of Geographical Sciences 2019年第9期29卷 1578-1594页

作者： TONG Jinhui HU Jinhua LU Zheng SUN Haoran YANG Xiaofan State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical ScienceBeijing Normal University

Land use and cover change(LUCC) is an important indicator of the human-earth system under climate/environmental change,which also serves as a key impact factor of carbon balance,and a major source/sink of soil carbon *** heihe River Basin(HRB) is known as a typical ecologically fragile area in the arid/semi-arid regions of northwestern China,which makes it more sensitive to the ***,its sensitivity varies in a broad range of controlling factors,such as soil layers,LUCCs and calculation methods(*** fixed depth method,FD,and the equivalent mass method,ESM).In this study,we performed a meta-analysis to assess the response of soil organic carbon(SOC) and total nitrogen(TN) storage to the LUCC as well as method bias based on 383 sets of SOC data and 148 sets of TN data from the *** first evaluated the calculation methods and found that based on the FD method,the LUCC caused SOC and TN storage to decrease by 17.39% and 14.27%,respectively;while the losses estimated using the ESM method were 19.31% and 18.52%,*** deviations between two methods were mainly due to the fact that the FD method ignores the heterogeneity of soil bulk density(BD),which may underestimate the results *** then analyzed the response of SOC and TN storage to various types of the *** particular,when woodland and grassland were converted into cultivated land or other land types,SOC and TN suffered from heavy losses,while other LUCCs had minor ***,we showed that increasing the depth of the soil layers would reduce the losses of SOC and TN *** summary,we identified a series of controlling factors(*** layer,the LUCC and calculation method) to evaluate the impact of the LUCC on SOC and TN storage in the HRB,which should be considered in future research.

关键词： heihe River Basin LUCC, meta-analysis soil organic carbon total nitrogen

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Rainfall interception of typical ecosystems in the heihe River Basin: Based on high temporal resolution soil moisture data

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Journal of Geographical Sciences 2019年第9期29卷 1527-1547页

作者： YANG Chongyao HUANG Yongmei LI Engui LI Zeqing State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical ScienceBeijing Normal University

Rainfall interception is of great significance to the fully utilization of rainfall in water limited *** now,studies on rainfall partitioning process of typical ecosystems in heihe River Basin,one of the most important inland river basins in China,is still *** this study,six typical ecosystems were selected,namely alpine meadow,coniferous forest,mountain steppe,desert,cultivated crop,and riparian forest,in heihe River Basin for investigation of the rainfall interception characteristics and their influencing factors,including rainfall amount,duration,and intensity,based on the gross rainfall and high temporal resolution soil moisture data obtained from 12 automatic observation *** results show that the average interception amount and average interception rate of the six ecosystems are significantly different: alpine meadow 6.2 mm and 45.9%,coniferous forest 7.4 mm and 69.1%,mountain steppe 3.5 mm and 37.3%,desert 3.5 mm and 57.2%,cultivated crop 4.5 mm and 69.1%,and riparian forest 2.6 mm and 66.7%,*** rainfall amount,duration,and intensity all had impact on the process of rainfall *** these three factors,the impact of rainfall amount was most *** responses of these ecosystems to the rainfall characteristics were also *** rainfall interception with high temporal resolution soil moisture data is proved to be a feasible method and need further development in the future.

关键词： rainfall interception heihe River Basin soil moisture rainfall utilization

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Spatial patch structure and adaptive strategy for desert shrub of Reaumuria soongorica in arid ecosystem of the heihe River Basin

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Journal of Geographical Sciences 2019年第9期29卷 1507-1526页

作者： LI Wei LI Xiaoyan HUANG Yongmei WANG Pei ZHANG Cicheng State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China School of Land Resources & Urban and Rural Planning Hebei GEO UniversityShijiazhuang 050031China School of Natural Resources Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China

In many arid ecosystems,vegetation frequently occurs in high-cover patches interspersed in a matrix of low plant ***,theoretical explanations for shrub patch pattern dynamics along climate gradients remain unclear on a large *** context aimed to assess the variance of the Reaumuria soongorica patch structure along the precipitation gradient and the factors that affect patch structure formation in the middle and lower heihe River Basin(HRB).Field investigations on vegetation patterns and heterogeneity in soil properties were conducted during 2014 and *** results showed that patch height,size and plant-to-patch distance were smaller in high precipitation habitats than in low precipitation ***,soil and vegetation explained 82.5% of the variance in patch ***,*** shifted from a clumped to a random pattern on the landscape towards the MAP gradient,and heterogeneity in the surface soil properties(the ratio of biological soil crust(BSC) to bare gravels(BG)) determined the *** population distribution pattern in the middle and lower HRB.A conceptual model,which integrated water availability and plant facilitation and competition effects,was revealed that *** changed from a flexible water use strategy in high precipitation regions to a consistent water use strategy in low precipitation *** study provides a comprehensive quantification of the variance in shrub patch structure along a precipitation gradient and may improve our understanding of vegetation pattern dynamics in the Gobi Desert under future climate change.

关键词： patch structure spatial pattern precipitation soil heterogeneity Reaumuria soongorica heihe River Basin

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Analyses of geographical observations in the heihe River Basin: Perspectives from complexity theory

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Journal of Geographical Sciences 2019年第9期29卷 1441-1461页

作者： Gao Jianbo FANG Peng YUAN Lihua State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Institute of Complexity Science and Big Data Technology Guangxi UniversityNanning 530004China Wuhan National Laboratory for Optoelectronics Key Laboratory of In formation Storage SystemEngineering Research Center of Data Storage Systems and TechnologyMinistry of Education of ChinaSchool of Computer Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China Center for GeoData and Analysis Faculty of Geographical ScieneeBeijing Normal UniversityBeijing 100875China

Since 2005,dozens of geographical observational stations have been established in the heihe River Basin(HRB),and by now a large amount of meteorological,hydrological,and ecological observations as well as data pertaining to water resources,soil and vegetation have been *** adequately analyze these available data and data to be further collected in future,we present a perspective from complexity *** concrete materials covered include a presentation of adaptive multiscale filter,which can readily determine arbitrary trends,maximally reduce noise,and reliably perform fractal and multifractal analysis,and a presentation of scale-dependent Lyapunov exponent(SDLE),which can reliably distinguish deterministic chaos from random processes,determine the error doubling time for prediction,and obtain the defining parameters of the process *** adaptive filter is illustrated by applying it to obtain the global warming trend and the Atlantic multidecadal oscillation from sea surface temperature data,and by applying it to some variables collected at the HRB to determine diurnal cycle and fractal *** SDLE is illustrated to determine intermittent chaos from river flow data.

关键词： heihe River basin geographical observation complexity theory adaptive multiscale filter fractal analysis scale-dependent Lyapunov exponent

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Turning Hostility into Friendship——heihe’s Frontier Cultural Exchange

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China & The World Cultural Exchange 1993年第5期59卷 10-12页

heihe is a city of strategicimportance on the northeastem border of China on thebanks of the Heilong *** openborder town since March 1992,ithas gradually made its entry into theworld and made contributions in cul-tura... 详细信息

关键词： Frontier heihe contributions Russia border entry frontier chance tourism 医级

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Alignment of social and ecological structures increased the ability of river management

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Science Bulletin 2019年第18期64卷 1318-1324页

作者： Shuai Wang Bojie Fu Orjan Bodin Jianguo Liu Mengmeng Zhang Xiaoyan Li State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Stockholm Resilience Centre Stockholm UniversityStockholm 10691Sweden Center for Systems Integration and Sustainability Department of Fisheries and WildlifeMichigan State UniversityEast LansingMl 48823USA

Large hydrologic basins involve multiple stakeholders, and coupled dynamic social and ecological processes. Managing such basins has long been a challenge. Balancing the demand for water from nature against that from humans is always difficult, particularly in arid watersheds. Here, we analyze potential institutional causes of ecological degradation and how it can be reversed by introducing new forms of governance. The framework and assumptions are illustrated using China’s second-largest endorheic basin, where empirical evidence shows that the introduction of a new governing authority connecting midstream and downstream actors facilitated the establishment of a new governance regime that is better aligned with the biophysical scales of the watershed. A trans-regional water allocation project initiated by the new higher-level authority successfully rescued downstream oases and restored a dried terminal lake. These outcomes suggest that when social and ecological structures are better aligned our ability to manage the interplay between social and ecological processes increases. However, the lack of direct connection between the actors of the middle and lower reaches resulted in the paradox of an increase in water demand. We therefore suggest that measures to stimulate the emergence of horizontal social ties linking different critical groups of actors across the watershed could further the alignment of the institutional and biophysical structures-without these changes sustainable management of river basins and other common pool resources will remain problematic.

关键词： River management heihe River Social ecological system Institutional fit

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