Arid Land Geography

There are close relations between plants distribution and regional climate. Xinjiang is characterized for the various regional climate features and distinctive medicinal plants resources because of the abundant topography and landforms. The relationships between the geographical distribution pattern of medical plants and regional climate characteristics are discussed through medical plants distribution and regional climate characteristics. Based on the data of The Third Survey Of Chinese Medicine Resources,the spatial distribution of main traditional Chinese medicine plants such as Glycyrrhiza,Lithospermum,Ephedra,Cistanche,Lycium and so on is presented. According to the topography and climatic conditions. Xinjiang is divided into five regions of medicine plants as Altay,Ili,Turpan and Hami,Hotan and Kashi,Bayingolin. The paper analyzed the species richness and species diversity indices base on the climate characteristics analysis diagram the space classified of with Arc GIS. The results show that Tianshan Mountains is a major region of wild medicinal materials which has the highest species richness. In addition,the annual average temperature and accumulated temperature of southern Xinjiang is higher than that of northern Xinjiang because of to the barrier function of Tianshan Mountains and the different underlying surface in southern and northern of Xinjiang. The precipitation on western Xinjiang is more than that on eastern region,because the rainfall from the Atlantic is difficult to reach the inland of Xinjiang due to the long way and the barrier of mountains.Relative humidity has the same state as precipitation,while the average annual sunshine has the opposite trend. Two regions in Xinjiang have unique features. The first one is Ili-Tacheng Prefecture with rich wild medicine plants in Xinjiang due to a mild climate and abundant rainfall. Another region is Kashi Prefecture with the January high temperature which can ensure the medical plants to survive during the cold winter.

Li Hu

Ganhanqu dili

Climatic features and geographical distribution of medicinal plants in Xinjiang

新疆药用植物的气候特征与地理分布

Liu Hai-lon

Hierarchical scale structure's evolution of urban system based on ecological carrying capacity in Loess Plateau region:a case of Qingyang City

基于黄土高原地区生态承载力的城市系统层次规模结构演变——以庆阳市为例

As one of the major issues in global environmental research,the impacts of climatic factors on regional vegetation variability has attracted widespread attention from scientists and it is important to understand the driving mechanism of this variation by using remote sensed data and meteorological observations. In this study,based on meteorological data in the period of 1980-2012,MODIS-NDVI data in the period of 2000-2012 and methods of linear regression and correlation analysis,our aim is to explain how climate changes impact on Qinghai and Tibet alpine grasslands since the 21 st century. Results indicated as follows:(1)Qinghai and Tibet regions both showed warm and humid trends over 1980-2012. But in Tibet region,annual precipitation performed a decreasing trend with less significant in the period of 2000-2012. Warming trend was significantly throughout the central and western regions of the Tibetan plateau(0.05 ℃·a-1).(2)At the interannual scale(in 2000-2012),NDVI showed a significantly increasing trend in Qinghai region,with the rate of 0.003·a-1(P0.05). However,unchanged trend in NDVI was found in Tibet region owing to that vegetation degradation and recovery mutually offset at the regional scale. Spatial NDVI largely presented rising trends in northeastern of the Tibetan Plateau with the slope of 0.01·a-1,but in southern Tibetan Plateau,NDVI trends were worse at the slope of 0.008·a-1.(3)Regional correlation analysis expounded the different trends in Qinghai and Tibet regions. In Qinghai region,increasing precipitation and warming temperature together promote positive trends of regional vegetation. Reducing precipitation and rising temperature might be important reasons causing vegetation deterioration in the south of Tibet region.

Liu Zheng-ji

Variation of alpine grasslands and its response to climate warming in the Tibetan Plateau since the 21st Century

21世纪以来青藏高原高寒草地的变化及其对气候变暖的响应

In this paper,according to the characters of natural geography of Bayingolin Autonomous Prefecture of Mongolia,GIS analysis and expert integration method were used to evaluate soil salinization sensitivity,land desertification sensitivity,soil erosion sensitivity and biodiversity and habitat sensitivity evaluation,respectively.Evaluation of soil erosion sensitivity mainly considered the precipitation,relief amplitude,soil texture and vegetation factors;Desertification sensitivity evaluation mainly takes into consideration the wetness index,wind velocity,soil texture and vegetation coverage factors;Soil salinization sensitivity evaluation mainly takes into consideration the ground water level,evaporation/rainfall,groundwater salinity and landform;Biodiversity and habitat sensitivity evaluation mainly considered land use status and the number of national and provincial nature reserve.At last,a comprehensive evaluation on the ecological environment sensitivity was studied. The data used in this paper includes:(1)land use types of the study area from Xinjiang environmental monitoring station(1∶10 000);(2)soil type map provided by China environmental monitoring station(1∶1 000 000);(3)1∶250 000 topographic data of the study area provided by the Xinjiang Uygur Autonomous Region Bureau of Surveying and Mapping;(4)the study area precipitation data from Xinjiang Uygur Autonomous Region Meteorological Bureau;(5)Xinjiang Uygur Autonomous Region statistical yearbook 2014;(6)1∶1 000 000 topography data provided by Institute of Geographic Sciences;(7)land desertification data of the study area provided by Xinjiang Uygur Autonomous Region forestry department. The results showed that the ecological environment sensitivity of Bayingolin Mongolian Autonomous Prefecture was divided into five grades: extremely sensitive,highly sensitive,sensitive,light sensitive and insensitive. The extremely sensitive area accounting for 5.7% of the whole state,covering an area of 27 459.18 km2;The highly sensitive area accounted for 26.4%,127 179.36 km2;The moderate sensitive area accounted for 30.8%,covering an area of 148 375.92 km2;The light sensitive area accounted for 16.4%,79 005.36 km2,and insensitive area accounted for 20.7%,covering an area of 99 720.18 km2. It is recommended to draw out a range of river water source protection zone for ecological restoration,and ban all land clearing and large construction projects. The implementation of the water conveyance project of Tarim River has partly solved the problem of river long cutoff,but a green belt should be designed on both sides of the river to restore water ecological function of rivers at the same time. Tarim Basin is the main farmland area of Bayingolin Mongolian Autonomous Prefecture but river water ecosystem is not optimistic,and is facing land desertification hazard. The ecological problem brought by the industrial policy,population,and rapid development of economy is inevitable;therefore,we should fully pay more attention to ecological construction while developing economy.

Yan H

Ecological sensitivity of Bayingolin Mongolian Autonomous Prefecture of Xinjiang

新疆巴音郭楞蒙古自治州生态敏感性

More researches have been conducted on tree rings and their responses to climate change,but the researches through the exact tree growth to reflect climate change is relatively rare. Tree ring is just one of the important indices for measuring trees growth,and can not fully and correctly reflect tree growth,therefore,this paper attempts to clarify the response of Siberia and broad-leaved mixed forest to climate change by analyzing the impact of climate change on the growth of Siberian Larch during this period and to provide scientific basis for the management of local forest resources. Two samples(AYS,SYK)of Siberian Larch(Larix sibirica)were adopted at central region of Altay Mountains for annual tree ring sampling data in 2012 and obtained the 1969-2011 tree volume growth sequence using Xinjiang Siberian Larch unary volume equation. Correlation analysis of Siberian Larch growth amount and seasonal temperature data was made with SPSS 19.0 software and the model of Siberian Larch growth and seasonal temperature was established for the response the Siberian Larch growth to temperature change and precipitation change. Results show that: in the past 50 years,Siberian larch wood product growth showed a significant increasing trend and has good correlation with the temperature of the growing season;and then showed negative correlation with the June precipitation,and positive correlation with the August precipitation. When growth season average temperature reached 19-21 ℃,Siberian Larch growth amount is the largest. The sensitivity of Siberian Larch growth to the variation of temperature is high at SYK sample plot,and the net volume growth increases 0.936 mm~3 per piece of tree with the temperature increasing 1 ℃;while the sensitivity of Siberian Larch growth to the variation of temperature is relatively low at AYS sample plot,and the net volume growth increases 0.661 mm~3 per piece of tree with the temperature increasing 1 ℃.

Huang Li-pin

Growth of Siberia Larch in the middle east of Altay Mountains and its response to climate change

阿尔泰山中东部西伯利亚落叶松生长及其对气候变化的响应

The velocity of saltating sand is a key parameter in aeolian movement,but remains poorly understanding because of limitations in the available measurement technology.High-speed photography illuminated by intensive and continuous laser provides an efficient method to track the trajectories of saltating particles.From a digital recording of the trajectory,particle velocity and other movement parameters can be derived.However,accurate and quick reconstruction of particle trajectories from video images is not yet possible,as this requires the use of prohibitively laborious manual methods.In addition,light reflection from the bed decreases the contrast between near-surface particles and the bed.This makes saltation information near the surface difficult to obtain,even though this data is vitally important for studying particle entrainment processes and the mechanisms by which particles leave the surface.In this paper,we used motion-detection algorithms based on the subtraction of consecutive images and developed a new series of high-contrast images from the original images.We then describe two novel methods for tracking the trajectories of saltating particles and determining the velocity field in a cloud of blowing sand,respectively.We tracked particles by combining a manual operation with a computerized operation,and then the movement parameters of saltating sand particles in air and near the bed surface,such as the lift-off velocity and angle,impact velocity and angle,characteristic length and height,and instantaneous velocity and accelerated velocity vector at each point in the trajectory were quickly and accurately calculated by polynomial fitting method.Compared with traditional manual track method,this novel technique can easier to obtain a large number of continuous points within one or more trajectories.We evaluated the velocity field by a novel two-frame PTV algorithm based on the concept of maximizing the match efficiency.This approach overcomes some disadvantages of the conventional PTV methods,such as similar movement patterns within a small region,a uniform particle distribution,and high particle density.For the flow of saltating particles,there is high heterogeneity in the particle velocities due to the existence of two distinct grain populations:ascending and descending grains.Therefore,this improved PTV method not only can satisfy the requirement for a large sample size but also is more suitable for measuring the velocity of sand particles in an air/particle two-phase flow.The results shed new light on the complicated mechanisms involved in sand saltation and should prove useful in formulating and evaluating more accurate theoretical models of saltation.

Jiang Chan-wen

Wang Xiao-yan

Dong Zhi-bao

High-speed photography in measuring the velocity of sand particles in an air/particle two-phase flow

高速摄影在气固两相流中沙粒速度测量中的应用

短名	ARID LAND GEOGRAPHY
期刊索引	北大核心中国科学引文数据库

ISSN	1000-6060
h-index	14

出版信息	出版商: Science China Press，出版周期: ，期刊类型: journal，开源期刊: 否
基本数据	创刊年份: 2019，原创研究文献占比: ，自引率:， Gold OA占比:

Arid Land Geography

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Climatic features and geographical distribution of medicinal plants in Xinjiang

Hierarchical scale structure's evolution of urban system based on ecological carrying capacity in Loess Plateau region:a case of Qingyang City

Variation of alpine grasslands and its response to climate warming in the Tibetan Plateau since the 21st Century

Ecological sensitivity of Bayingolin Mongolian Autonomous Prefecture of Xinjiang

Growth of Siberia Larch in the middle east of Altay Mountains and its response to climate change

High-speed photography in measuring the velocity of sand particles in an air/particle two-phase flow

High-speed photography in measuring the velocity of sand particles in an air/particle two-phase flow

High-speed photography in measuring the velocity of sand particles in an air/particle two-phase flow

High-speed photography in measuring the velocity of sand particles in an air/particle two-phase flow

High-speed photography in measuring the velocity of sand particles in an air/particle two-phase flow