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Dynamic change of landscape pattern and hydrological & geochemical characteristic analysis before and after the emergency water transportation in the lower reaches of the Tarim River, china

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Acta Geochimica 2006年第S1期 274-275页

作者： Qing HUANG, Ranghui wang, Shixin WU xinjiang institute of ecology and geography, chinese academy of sciences, urumqi 83.011, china

Carbon Dioxide Fluxes and Concentrations in a Cotton Field in Northwestern china:Effects of Plastic Mulching and Drip Irrigation

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Pedosphere 2011年第2期21卷 178-185页

作者： LI Zhi-Guo Key Laboratory of Oasis ecology and Desert Environment Xinjiang Institute of Ecology and Geography Chinese Academy ofSciences Urumqi 830011 (China) Graduate University of chinese academy of sciences Beijing 100049 (China) institute of Soil Science Chinese Academy of Sciences Nanjing 210008 (China) Earth System Science Interdisciplinary Center University of Maryland College Park MD 20740 (USA)

In northwestern china, there has been a change from traditional cultivation system （TC） with no mulching and flood irrigation to a more modern cultivation system （MC） using plastic film mulching with drip irrigation. A field study was conducted to compare soil ＇C02 concentrations and soil surface COs fluxes between TC and MC systems during a cotton growing season. CO2 concentrations in the soil profile were higher in the MC system （3107-9212μL L-1） than in the TC system （1 275-8994 μL L-1） but the rate of CO2 flux was lower in the MC system. Possible reasons for this included decreased gas diffusion and higher soil moisture due to the mulching cover in the MC system, and the consumption of soil CO2 by weathering reactions. Over the whole cotton growing season, accumulated rates of CO2 flux were 300 and 394 g C m-2 for the MC and TC systems, respectively. When agricultural practices were converted from traditional cultivation to a plastic film mulching system, soil CO2 emissions could be reduced by approximately 100 g C m-2 year-1 in agricultural lands in arid and/or semi-arid areas of northern and northwestern china.

关键词： agricultural practice carbon cycle greenhouse gas emission soil respiration weathering reaction

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On the sand surface stability in the southern part of Gurbantünggüt Desert

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中国科学：地球科学英文版 2005年第6期48卷 778-785页

作者： wang Xueqin1,2, wang Tao1, JIANG Jin2 & ZHAO Congju2 1. Laboratory of Blown Sand Physics and Desert Environment, Cold and Arid Regions of Environmental and Engineering Research In-stitute, chinese academy of sciences, Lanzhou 730000, china 2. xinjiang institute of ecology and geography, chinese academy of sciences, Urmqi 83.011, china Correspondence should be addressed to wang Xueqin 1. Laboratory of Blown Sand Physics and Desert Environment Cold and Arid Regions of Environmental and Engineering Research In-stitute Chinese Academy of Sciences 730000 Lanzhou China 2. xinjiang institute of ecology and geography Chinese Academy of Sciences 830011 Urümqi China

Longitudinal dunes are the most widespread dune types in the world sand seas but comprehensive study on the sand surface stability is scarce. The southern part of Gurbantnggt Desert is mainly covered by longitudinal dune in which fixed and semi-fixed dunes occupy over 80% of the total area. Systematic analysis on the climatic conditions, the soil moisture and vegetation distributions, and the sand surface activities showed that the fixed and semi-fixed dunes are in a comprehensive low-energy wind environment. Snow cover and frozen soil provide a good protection to the ground surface in winter. The temporal distribution of precipitation and corresponding variation of temperature create a favorable condition for the desert plants growth, especially for the ephemeral plants. The occurrence of effective winds for sand moving in April to June coincides with the stage of relatively wet sand surface and good vegetation cover, which effectively keep the sand surface stable at the interdune and the plinth of the dunes. Activity sand surface appears only at the crest and the upper part of the sand dunes.

关键词： Gurbantünggüt Desert, longitudinal dune, sand surface stability.

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Effects of climate change on relationship between water and salts of waters ecosystems in arid zone, china

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Acta Geochimica 2006年第S1期 163-164页

作者： Junfang HUANG1,2, Ranghui wang1 1 xinjiang institute of ecology and geography, chinese academy of sciences, urumqi 330011, china 2 Graduate School of the chinese academy of sciences, Beijing 100039,china

ANAEYSIS ON IMPACT FACTORS TO SCRUBLAND SOIL RESPIRATION IN THE SOUTHERN GURBANTUNGGUT DESERT,CENTRAL ASIA

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ANAEYSIS ON IMPACT FACTORS TO SCRUBLAND SOIL RESPIRATION IN ...

Study on the Dynamics Mechanism of Railway Flood in xinjiang Line of New Eurasian Continental Bridge

第三世界生态高峰会

作者： ZHU Hong ZHAO Chengyi LI Jung LI Yujie wang Feng xinjiang institute of ecology and geography,chinese academy sciences.urumqi 83.011 china

Monitoring soil CO respiration with chamber measurements,and identifying controlling factors such as the diversity of vegetation species,moisture and temperature,can help guide desert scrublands management,We examined soil CO respiration and potential controlling factors at Four sites in desert scrubland along Sangong River Basin（SRB）in northwestern of china in *** CO respiration was descending along SRB as well as the diversity of vegctation species,air temperature and air *** sites at the low reaches of SRB among these locations were monitored to analyze the effects of pH value,soil organic carbon（SOC）,total nitrogen（TN）and carbonate calcium（CaCO）on soil CO respiration during the growth season in *** desert（ND）site,one of them was located in the south edge of Gurbantunggut Desert;FS site,the other one was in the border area of SRB Alluvial ***-way ANOVA was performed about them. The result showed thai air humidity and CaCO content had a strong influence on soil CO respiration:SOC content was a limitation to soil CO respiration in arid-desert *** management activities can attenuate soil CO respiration and keep carbon balance trends desirably in desert scrublands.

关键词： ANAEYSIS ON IMPACT FACTORS TO SCRUBLAND SOIL RESPIRATION IN THE SOUTHERN GURBANTUNGGUT DESERT,CENTRAL ASIA

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Wuhan University Journal of Natural sciences 2003年第S2期 1029-1033页

作者： Yang Si-quan, Chen Ya-ning, wang Ang-sheng, Zhang Jian-guo, Li Wei-hong institute of Atmospheric Physics, chinese academy of sciences, Beijing 100029, china china National Center for Disaster Reduction, Ministry of Civil Affairs, Beijing 100053, china xinjiang institute of ecology and geography, chinese academy of sciences, urumqi 83.011, xinjiang, china institute of Mountain Hazards and Environment, chinese academy of sciences, Chengdu 610041, Sichuan, china

In this paper, taking railway flood in xinjiang Line of New Eurasian Continental Bridge as an example, the dynamics mechanism of railway flood has been studied by using Chaotic Theory. During study, some nonlinear features of railway flood, such as correlation dimension D2 and Kolomogorov entropy K, are analyzed based on time-series of railway flood in xinjiang Line of New Eurasian Continental Bridge. Results show: time-series distribution of railway flood has some characteristics of Chaos dynamic system, and the variation of railway flood frequency is a definite low-dimension Chaotic attractor. The average length of Tp(Tp = 15d) calculated in this paper, which shows the time of forecasting by this Chaotic dynamic system, is close to the reality.

关键词： dynamics mechanism railway flood chaotic theory

A study on an oligotrophic bacteria and its ecological characteristics in an arid desert area

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Science china Earth sciences 2007年第S1期 128-134页

作者： PAN HuiXia, CHENG ZhengMing, ZHANG XueMei, MU ShuYong, QI XiaoLing & wang Fang xinjiang institute of ecology and geography, chinese academy of sciences, ürümqi 83.011, china

An oligotrophic bacterium was isolated from the biological soil crust underlayer in the xinjiang Gurbantunggut Desert. It was numbered SGB-5, G+. Cell size is (0.328-0.746) μm×(0.171-0.240) μm. Raised colony is white, roundness and its diameter is 5 mm. The strain is a facultative aerobe. It was able to grow in conditions of 1―15 mg·C·L?1 culture medium at 10―50℃. The strain’s optimum growth temperature is 37℃. The range of its optimum growth pH is 8―9. A large amount of extracellular mucopolysaccharide was secreted during growth. The chemical composition of this mucopolysaccharide consists of arabinose, X sugar, glucose, galactose and mannitol. Mole ratio of these sugars is 1:14:19:6:14. The viscosity of the mucopolysaccharide can reach 6300 mPa·s, when the strain is cultivated for 72 h. After the culture solution in which viscosity was 1500 mPa·s was sprinkled on the quicksand surface, 6 mm bacteria crust of conglutinating sand was formed. This crust could not only stabilize sand, but could also potentially slow the rate of the soil water evaporation.

关键词： Oligotrophic bacteria Ecological characteristics

Ecological Security Assessment on Ecotypes Zones and Countermeasures of the Ecologic Restoration in Mamas River Basin over the past 30 Years

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Ecological Security Assessment on Ecotypes Zones and Counter...

Expansion of ürümqi urban area and its spatial differentiation

海峡两岸三地环境与资源学术研讨会暨第二届中国环境资源与生态保育学会会员代表大会

作者： wang Yue-jian~(1,a),XU Hai-liang~(2,b) 1.Department of geography,Shihezi University,xinjiang Shihezi 832003 & School of Geographical sciences,Southwest University,Chongqing,400715 2.xinjiang institute of ecology and geography chinese academy of sciences,xinjiang urumqi 83.011

There are different Ecological Zones in respect to the geographical area of arid zone river basin, Ecological Security Problem in different Ecological Zones of arid river basin are to be on the *** Mamas River Basin as an example,this paper developed an Eco-Security Evaluation indicator system for the four Ecological zones of the upper,middle and lower reaches of the river,and carried out evaluations of the Ecological Security from 1976 to 2006 accordingly with the support of GIS and other *** result shows that,during the past 30 years,the Ecological Security of the mountainous regions in the upper reaches,the oasis agricultural regions in the middle and lower reaches,and the desert regions in the lower reaches partially decreased,especially the oasis agricultural regions in the middle and lower reaches where there was the minimum degree of security,while that in urban regions in the middle reaches *** Scological Security problems are becoming apparent in Mamas River *** restore the Ecological Environment in the Manias River Basin,The author reported countermeasures mat we should take water resources reasonably exploited as main handhold and the upper,middle and lower reaches of the River Basin should be comprehensively controlled.

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Science china Earth sciences 2007年第S1期 159-168页

作者： DONG Wen1,2, ZHANG XiaoLei1, wang Bin1,2 & DUAN ZuLiang1,2 1 xinjiang institute of ecology and geography, chinese academy of sciences, ürümqi 83.011, china 2 Graduate School of chinese academy of sciences, Beijing 100049, china

The expanded area and structure of urban lands and landscape features in ürümqi City are analyzed using RS and GIS means based on the MSS image in 1975 and the TM images in 1990, 1999 and 2002, as well as other related maps. On which the scale, intensity and spatial differentiation of the expansion of the ürümqi urban area during different periods are lucubrated. The results reveal that urban expansion was rapid during the periods of 1949―1965 and 1975―1990, and that it was stable after the 1990s. The urban expansion pattern was significantly different during different time periods: the urban area was expanded outwards based on old districts in a spanned development pattern during the period of 1949―1965; development was stagnant during the period of 1965―1975; urban expansion developed mainly in old districts in a grouped way during the period of 1975―1990. The trend of urban expansion along the traffic lines was obvious, and the direction of urban expansion was dominated by the south-north zonal expansion and supplemented by east-west axial expansion; urban expansion reached the development stage of "multiple centers and multiple districts" after the 1990s, and urban networks were developed more precisely after this time. The sources for urban expansion were mainly cultivated lands, grasslands and unused lands; during urban expansion, the land area devoted to traffic lines, residential areas, dispersive industrial and mineral areas, and garden plots was rapidly enlarged.

关键词： RS & GIS urban land spatial differentiation expansion intensity and pattern