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Modeling the distribution of Populus euphratica in the Heihe river basin, an inland river basin in an arid region of China

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Science China Earth Sciences 2018年第11期61卷 1669-1684页

作者： Yanlong GUO Xin LI Zefang ZHAO Haiyan WEI Key Laboratory of Remote Sensing of Gansu Province Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou 730000 China University of Chinese Academy of Sciences Beijing 100049 China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101 China School of Geography and Tourism Shaanxi Normal University Xi'an 710119 China

Populus euphratica is a dominant tree species in riparian Tugai forests and forms a natural barrier that maintains the stability of local oases in arid inland river basins. Despite being critical information for local environmental protection and recovery, establishing the specific spatial distribution of P. euphratica has rarely been attempted via precise and reliable species distribution models in such areas. In this research, the potential geographic distribution of P. euphratica in the Heihe river basin was simulated with MaxEnt software based on species occurrence data and 29 environmental variables. The result showed that in the Heihe river basin, 820 km^2 of land primarily distributed along the banks of the lower reaches of the river is a suitable habitat for P. euphratica. We built other MaxEnt models based on different environmental variables and another eight models employing different mathematical algorithms based on the same 29 environmental variables to demonstrate the superiority of this *** based on 29 environmental variables performed the best among these models, as it precisely described the essential characteristics of the distribution of P. euphratica forest land. This study verified that MaxEnt can serve as an effective tool for species distribution in extremely arid regions with sufficient and reliable environmental variables. The results suggest that there may be a larger area of P. euphratica forest distribution in the study area and that ecological conservation and management of *** should prioritize suitable habitat. This research provides valuable insights for the conservation and management of degraded P. euphratica riparian forests.

关键词： Populus euphratica MaxEnt Species distribution models Model comparison inland river basin

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Sensitivity analyses of different vegetations responding to climate change in inland river basin of China

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Journal of Geographical Sciences 2012年第3期22卷 387-406页

作者： Hou Peng Wang Qiao Cao Guangzhen Wang Changzuo Zhan Zhiming Yang Bingfeng Satellite Environment Application Center Ministry of Environmental Protection Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites China Meteorological Administration School of Architecture Tsinghua University

Terrestrial ecosystem and climate system are closely related to each other. Faced with the unavoidable global climate change, it is important to investigate terrestrial ecosystem responding to climate change. In inland river basin of arid and semi-arid regions in China, sensitivity difference of vegetation responding to climate change from 1998 to 2007 was analyzed in this paper. （1） Differences in the global spatio-temporal distribution of vegetation and climate are obvious. The vegetation change shows a slight degradation in this whole region. Degradation is more obvious in densely vegetated areas. Temperature shows a general downward trend with a linear trend coefficient of -1.1467. Conversely, precipitation shows an increasing trend with a linear trend coefficient of 0.3896. （2） About the central tendency response, there are similar features in spatial distribution of both NDVI responding to precipitation （NDVI-P） and NDVI responding to AI （NDVI-AI）, which are contrary to that of NDVI responding to air temperature （NDVI-T）. Typical sensitivity region of NDVI-P and NDVI-AI mainly covers the northern temperate arid steppe and the northern temperate desert steppe. NDVI-T typical sensitivity region mainly covers the northern temperate desert steppe. （3） Regarding the fluctuation amplitude response, NDVI-T is dominated by the lower sensitivity, typical regions of the warm temperate shrubby, selui-shrubby, bare extreme dry desert, and northern temperate meadow steppe in the east and temperate semi-shrubby, dwarf arboreous desert in the north are high response. （4） Fluctuation amplitude responses between NDVI-P and NDVI-AI present a similar spatial distribution. The typical sensitivity region mainly covers the northern temperate desert steppe. There are various linear change trend responses of NDVI-T, NDVI-P and NDVI-AI. As to the NDVI-T and NDVI-AI, which are influenced by the boundary effect of semi-arid and semi-humid climate zones, there is less correlation of thei

关键词： vegetation climate satellite images sensitivity analyses inland river basin China

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Simulation of hydrological processes of mountainous watersheds in inland river basins: taking the Heihe Mainstream river as an example

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Journal of Arid Land 2014年第1期6卷 16-26页

作者： ZhenLiang YIN HongLang XIAO SongBing ZOU Rui ZHU ZhiXiang LU YongChao LAN YongPing SHEN Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Key Laboratory of Ecohydrology of inland river basin Chinese Academy of Sciences College of Earth and Environmental Sciences Lanzhou University

The hydrological processes of mountainous watersheds in inland river basins are *** is absolutely significant to quantify mountainous runoff for social,economic and ecological *** paper takes the mountainous watershed of the Heihe Mainstream river as a study area to simulate the hydrological processes of mountainous watersheds in inland river basins by using the soil and water assessment tool(SWAT)*** simulation results show that both the Nash–Sutcliffe efficiency and the determination coefficient values of the calibration period(January 1995 to December 2002)and validation period(January 2002 to December 2009)are higher than 0.90,and the percent bias is controlled within±5%,indicating that the simulation results are *** to the SWAT performance,we discussed the yearly and monthly variation trends of the mountainous runoff and the runoff *** results show that from 1996 to 2009,an indistinctive rising trend was observed for the yearly mountainous runoff,which is mainly recharged by lateral flow,and followed by shallow groundwater runoff and surface *** monthly variation demonstrates that the mountainous runoff decreases slightly from May to July,contrary to other *** mountainous runoff is mainly recharged by shallow groundwater runoff in January,February,and from October to December,by surface runoff in March and April,and by lateral flow from May to September.

关键词： hydrological process mountainous runoff inland river basin soil and water assessment tool the Heihe Mainstream river

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Toward a socio-political approach to water management: successes and limitations of IWRM programs in rural northwestern China

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Frontiers of Earth Science 2020年第2期14卷 268-285页

作者： KuoRay MAO Qian ZHANG Yongji XUE Nefratiri WEEKS Department of Sociology Colorado State UniversityFort CollinsCO 80523USA Institute of Sociology Chinese Academy of Social SciencesBeijing 100001China School of Economies&Management Beijing Forestry UniversityBeijing 100083China

In rural north-western China,the tension between economic growth and ecological crises demonstrates the limitations of dominant top-down approaches to water *** the 1990s,the Chinese government adopted the Integrated Water Resources Management(IWRM)approach to combat the degradation of water and ecological systems throughout its rural *** the approach has had some success at reducing desertification,water shortage,and ecological deterioration,there are important limitations and obstacles that continue to impede optimum outcomes in water *** the current IWRM approach is instituted through a top-down centralized bureaucratic structure,it often fails to address the socio-political context in which water management is embedded and therefore lacks a complete treatment of how power is embedded in the bureaucracy and how it articulates through economic growth imperatives set by the Chinese *** approach has relied on infrastructure heavy and technocratic solutions to govern water demand,which has worked to undermine the focus on integration and public ***,the historical process through which water management mechanisms have been instituted are fraught with bureaucratic fragmentation and processes of centralization that work against some of its primary goals such as reducing uncertainty and risk in water management *** article reveals the historical,social,political,and economic processes behind these shortcomings in water management in rural northwestern China by focusing on the limitations of a top-down approach that rely on infrastructure,technology,and quantification,and thereby advances a more holistic,socio-political perspective for water management that considers the state-society dynamics inherent in water governance in rural China.

关键词： integrated water resources management topdown implementation inland river basin water rights China

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EVAPOTRANSPIRATION OF LOW-LYING PRAIRIE WETLAND IN MIDDLE REACHES OF HEIHE river IN NORTHWEST CHINA

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Chinese Geographical Science 2005年第4期15卷 325-329页

作者： WU Jin-kui DING Yong-jian WANG Gen-xu SHEN Yong-ping Yusuke YAMAZAKI Jumpei KUBOTA Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 P. R. China The Laboratory of Climate Study of China Metralogical Administration Beijing 100041 P. R. China Research Institute far Humanity and Nature Kyoto 602-0778 Japan

Low-lying prairie wetland, which has characteristics of both grassland and wetland, has irreplaceable ecological functions in inland river basins of Northwest China. Owing to its small-scale distribution, so far, the observation and research on it are rare. The estimation of evapotranspiration is significant to ecological and environmental construction, scientific management of pasture and protection of wetland. For studying the evapotranspiration （ET） of low-lying prairie wetland in the middle reaches of the Heihe river, an inland river, in Northwest China, the automatic weather station in Linze Ecological Experimental Station of Lanzhou University （39°15′ 3″N, 100°03′ 52″ E）, Linze, Gansu Province, was selected as a case study. Based on meteorological data collected, Bowen-Ratio Energy Balance （BREB） method was used to calculate the evapotranspiration （ET） of low-lying prairie wetland. The analysis results showed that in a whole year （September 2003 -August 2004）, the total ET was 611.5mm and mean daily 1.67mm/d. The ET varied with different growing stages. In non-growing stage （NGS）, initial growing stage （IGS）, middle growing stage （MGS） and end growing stage （EGS）, the ET was 0.57, 2.01, 3.82 and 1.49mrrdd, with a percentage of total ET of 18.26%, 9.20%, 61.83% and 10.71% respectively. In March, ET began to increase. But in April, the ET increased most. After that, it increased gradually and got the maximal value in July. From then on, the ET decreased gradually. In September, the ET decreased rapidly. With the ending of growing and the freezing of soil, the ET stopped from the middle of November to February in next year. Hourly ET analysis showed that at 8：00 a.m. （during MGS at 7：00 a.m.）, the evapotranspiration began, at 13：00 p.m. got its maximal value and at 19：00 p.m. （during MGS at 20：00 p.m.）, the evapotranspiration stopped. The intensity of ET in sunny day was much larger than that in cloudy day in the same growing stage.

关键词： evapotranspiration low-lying prairie wetland inland river basin

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