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Development of center pivot irrigation farmlands from 2009 to 2018 in the Mu Us dune field,China:Implication for land use planning

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Journal of Geographical Sciences 2022年第10期32卷 1956-1968页

作者： LIU Xiaokang DONG Zhibao DING Yaping LU Ruijie LIU Liyun DING Zhiyong LI Yijing School of Geography and Tourism Shaanxi Normal UniversityXi’an 710119China Engineering Center of desertification and Blown-Sand Control of Ministry of Education Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Planetary Aeolian Research Institute Shaanxi Normal UniversityXi’an 710119China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China

The Mu Us dune field in China has become a focal region for research of the prevention and control of *** practices in this area have been modernized in recent years,evidenced by the development of Center Pivot Irrigation(CPI)***,the impacts of CPI farmlands on combating desertification remain poorly *** study chose the southeastern part of the Mu Us dune field as a study area to investigate the variations of CPI farmlands from 2009 to 2018 and the influencing *** results showed growth trends in both the number and the area of these CPI farmland units over the *** areas of meso-and micro-scale CPI farmland units stabilized over time to mainly 0-0.2 km2 and 0.2-0.4 km2,respectively;Topography,temperature,and geological substratum were preliminarily identified as the major natural factors driving the development of the CPI *** the context of varied stakeholders,the potential for soil erosion,and damage to natural vegetation,the current study suggests that strict management of CPI farmland is required through effective long-term planning and land-use *** results of this study can assist in realizing the sustainable development of agriculture and its ecological significance in dune field areas.

关键词： center pivot irrigation Mu Us dune field agriculture development desertification land use planning

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Interactive effects of wind speed,vegetation coverage and soil moisture in controlling wind erosion in a temperate desert steppe,Inner Mongolia of China

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Journal of Arid Land 2018年第4期10卷 534-547页

作者： MENG Zhongju DANG Xiaohong GAO Yong REN Xiaomeng DING Yanlong WANG Meng Desert Control Science and Engineering College Inner Mongolia Agricultural UniversityHohhot 010018China Inner Mongolia Institute of Meteorological Science Hohhot 010051China Forestry College Beijing Forestry UniversityBeijing 100083China

The rapid desertification of grasslands in Inner Mongolia of China poses a significant ecological threaten to northern China. The combined effects of anthropogenic disturbances （e.g., overgrazing） and biophysical processes （e.g., soil erosion） have led to vegetation degradation and the consequent acceleration of regional desertification. Thus, mitigating the accelerated wind erosion, a cause and effect of grassland desertification, is critical for the sustainable management of grasslands. Here, a combination of mobile wind tunnel experiments and wind erosion model was used to explore the effects of different levels of vegetation coverage, soil moisture and wind speed on wind erosion at different positions of a slope inside an enclosed desert steppe in the Xilamuren grassland of Inner Mongolia. The results indicated a significant spatial difference in wind erosion intensities depending on the vegetation coverage, with a strong decreasing trend from the top to the base of the slope. Increasing vegetation coverage resulted in a rapid decrease in wind erosion as explained by a power function correlation. Vegetation coverage was found to be a dominant control on wind erosion by increasing the surface roughness and by lowering the threshold wind velocity for erosion. The critical vegetation coverage required for effectively controlling wind erosion was found to be higher than 60%. Further, the wind erosion rates were negatively correlated with surface soil moisture and the mass flux in aeolian sand transport increased with increasing wind speed. We developed a mathematical model of wind erosion based on the results of an orthogonal array design. The results from the model simulation indicated that the standardized regression coefficients of the main effects of the three factors （vegetation coverage, soil moisture and wind speed） on the mass flux in aeolian sand transport were in the following order： wind speed〉vegetation coverage〉soil moisture. These three factors had dif

关键词： desert steppe wind erosion desertification aeolian process sand transport Xilamuren grassland

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Driving forest succession in karst areas of Chongqing municipality over the past decade

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Forest Ecosystems 2020年第1期7卷 26-36页

作者： Qiang Xiao Yang Xiao Yuan Liu Jianping Tao Key Laboratory of Eco-environments in Three Gorges Reservoir Region(Ministry of Education) Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir RegionSchool of Life SciencesSouthwest UniversityChongqing 400715China Chongqing University of Arts and Sciences Chongqing 402160China College of Biology and Environmental Sciences Jishou UniversityJishou 416000China

Background:Karst areas in southwestern China exhibit ecological degradation in the form of rocky *** governments launched large-scale afforestation and other ecological restoration programs to curb this *** thickness is a key limiting factor for vegetation restoration in Karst areas,but the relationship between ecological restoration and soil thickness remains ***,afforestation consumes large amounts of water,which impacts water supply in karst *** this study,we used GIS and statistical analyses to determine rocky desertification sensitivity and its driving factors in karst areas of Chongqing municipality over the past ***:Soil thickness is one of the key factors that restrict ecological restoration of rocky *** 2000 to 2010,rocky desertification sensitivity in karst areas was on the rise along with an increase in *** of high sensitivity were mainly distributed in Pengshui County,Wulong District,and Youyang County;Shizhu County had the lowest overall incidence of *** distribution of rocky desertification was significantly affected by rainfall and soil *** analysis showed that the main factors controlling changes in rocky desertification in natural forest over time were precipitation which explained 23.73%of total variance,and soil thickness which explained 23.42%of total *** thickness and soil water content had a higher correlation coefficient(at 0.516)in natural forests than in planted ***:This study showed that increases in soil thickness in a karst area had a significant positive impact on the fragile ecological *** indicates that ecosystem restoration in karst areas will benefit from addressing soil thickness.

关键词： Rocky desertification GIS Karst areas Ecological restoration Ecological drivers

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Cost analysis of sand barriers in desertified regions based on the land grid division model

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Journal of Arid Land 2022年第9期14卷 978-992页

作者： YANG Suchang QU Zhun School of Economics Lanzhou UniversityLanzhou 730000China

Sand barriers are the most widely used mechanical implements for wind-blown sand control and desertification ***,there is no standard quantitative cost analysis of the sizes and materials required for sand *** this study,based on the original land grid division model for optimal resource utilization,we calculated the total side lengths of square and regular hexagonal sand barriers with the sizes of 1.0 m×1.0 m,2.0 m×2.0 m,and 3.0 m×3.0 m in a desertified region of the Shapotou area on the southeastern edge of the Tengger Desert,***,through literature review and social survey,we obtained the material cost and material utilization amount of sand barriers with different materials and ***,we calculated the costs of square and regular hexagonal sand barriers comprised of wheat straw,corn stalk,Salix mongolica,poly lactic acid,magnesium cement,and high-density polyethylene,with the sizes of 1.0 m×1.0 m,2.0 m×2.0 m,and 3.0 m×3.0 *** results show that the material cost of regular hexagonal corn stalk sand barriers with the size of 3.0 m×3.0 m is the lowest,while the material cost of square magnesium cement sand barriers with the size of 1.0 m×1.0 m is the *** using the same material,the cost of regular hexagonal sand barriers is lower than that of square sand barriers with the same *** using the same size,the cost of sand barriers with corn stalk material is lower than that of sand barriers with other *** on the above analysis,we can conclude that the economic benefits of regular hexagonal sand barriers are greater than those of square sand *** study provides a theoretical basis for accurately calculating the material cost of sand barriers,particularly for the estimated cost of mechanized sand barrier engineering projects.

关键词： desertification corn stalk sand barrier Salix mongolica land grid division economic cost railway Shapotou area

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Characterizing and monitoring global landscapes using GlobeLand30 datasets:the first decade of the twenty-first century

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International Journal of Digital Earth 2019年第6期12卷 642-660页

作者： Jamal Jokar Arsanjani Geoinformatics Research Group Department of Planning and DevelopmentAalborg University CopenhagenCopenhagenDenmark

Global land cover maps are important sources of information for a wide range of studies including land change analysis and climate change *** the global land cover maps attempt to present a consistent and homogenous data in terms of the production process,the existing datasets offer coarse resolution data,e.g.1000 m for IGBP DISCover and 300 m for GlobeCover 2009 that is oftentimes ***,GlobeLand30 data based on Landsat archive for two timestamps of 2000 and 2010 has been *** presents a finer spatial resolution of 30 m,which provides numerous opportunities for a wide range of *** main objective of this study is to use this dataset for characterizing global land cover patterns,monitoring,and identifying extreme land change cases with their types and *** findings reveal massive land change patterns including deforestation,desertification,shrinkage of water bodies,and urbanization across the *** results and discussions of this research can help policy-makers,environmental planners,ecosystem services providers and climate change researchers to gain finer insights about the forms of global land *** research calls for further investigation of the underlying causes of the massive changes and their consequences on our ecosystems and human populations.

关键词： Globeland30 historical land change global land cover maps urbanization deforestation water bodies’shrinkage desertification

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Using a Modified Soil-Plant-Atmosphere Scheme (MSPAS) to Study the Sensitivity of Land Surface and Boundary Layer Processes to Soil and Vegetation Conditions

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Advances in Atmospheric Sciences 2004年第5期21卷 717-729页

作者：刘树华乐旭刘辉志胡非 Group of Atmosphere Boundary Layer and Turbulence Laboratory of Severe Storm ResearchDepartment of Atmospheric Sciencesthe College of PhysicsPeking UniversityBeijing 100871 State Key Laboratory of Atmosphere Physics and Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029

A series of sensitivity tests are performed to test the stability and sensibility of the Modified Soil-Plant-Atmosphere Scheme (MSPAS), which was wholly introduced in a previous paper. The numerical simulation results from the experiments show good agreement with physical reality. Besides, some of the results are illuminating. Together with the first paper, it is concluded that MSPAS is a simple but effective model, and it is practically valuable in the research work of desertification control and reforestation in China.

关键词： Modified Soil-Plant-Atmosphere Scheme desertification sensitivity test

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Characterizing conservative and protective needs of the aridland forests of Sudan

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Journal of Forestry Research 2021年第6期32卷 2365-2373页

作者： Nasradeen A.H.Gadallah Abdelnasir I.A.Hano Eiman Diab Galal Omer Dep.of Forest Conservation and Protection Faculty of ForestryUniversity of KhartoumKhartoum North 13314Sudan Desrtification and Desert Cultivation Studies Institute University of KhartoumKhartoum North 13314Sudan National Center for Research Institute of Environment and Natural ResourcesKhartoum 1111Sudan

Forests in the aridlands of Sudan are distinctive in nature and require special attention due to the great role they play as a first and last line of defense against southward ***,to determine their conservative and protective needs based on current conditions in the Wad Al-Bashir Forest(WF),toward ensuring sustainable forest resources in these areas,we used a systematic field survey,existing and available documents review and key informant interviews(KII),to collect data from 08 December 2017 to 15 May 2018.A severe depletion and changes in the forest tree cover and composition were found during the field survey,where species such as Balanitis aegyptiaca is threatened and invasive species(e.g.,Acacia nubica)have started to *** documents have credited illegal cutting and agricultural activities for the changes in the forest status,whereas the KII indicated that past and current forest conservative and protective practices(CPPs),where forest clearance for agricultural,grazing,pests and disease control,were not given a deserved consideration as they relate to tree cutting and reforestation ***,negligence of the needs of those who depend on the forest and inadequate funds have constrained implementation of some ***,on the basis of the results of this study,we recommend that CPPs associated with agriculture,grazing,forest fire,pest and disease control should be a top priority concern of forest *** financial support,which could be enriched by involving governmental and non-governmental organizations,is also needed to boost CPPs in the *** species also need to be cleared and replaced by trees such as *** and *** that are of economic and environmental value.

关键词： Dry forest Forest conservation Protection desertification

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N and P resorption in a pioneer shrub(Artemisia halodendron) inhabiting severely desertified lands of Northern China

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Journal of Arid Land 2014年第2期6卷 174-185页

作者： YuLin LI Chen JING Wei MAO Duo CUI XinYuan WANG XueYong ZHAO Naiman desertification Research Station Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences

Nutrient resorption is an important conservation mechanism for plants to overcome nutrient limitation in the less fertile area of desertifled land. In the semi-arid Horqin Sandy Land of Northern China, the shrub Artemisia ha/odendron usually colonizes into the bare ground of severely desertified land as a pioneer species. It is, therefore, expected that A. ha/odendron will be less dependent on current nutrient uptake through efficient and proficient re- sorption of nutrients. In this study, we found that averaged nitrogen （N） and phosphorus （P） concentrations in se- nesced leaves significantly varied from 12.3 and 1.2 mg/g in the shifting sand dune to 15.9 and 1.9 mg/g in the fixed sand dune, respectively, suggesting that foliar N and P resorption of A. ha/odendron were more proficient in the shifting sand dune. In particular, positive relationships between nutrient concentrations in senesced leaves and soil nutrient availability indicate that A. ha/odendron in infertile habitats is more likely to manage with a low level of nu- trients in senesced leaves, giving this species an advantage in infertile soil. Moreover, foliar N- and P-resorption efficiencies and proficiencies showed limited inter-annual variability although annual precipitation varied greatly among 2007-2009. However, N and P resorption of A. ha/oc/endron were not more efficient and proficient than those previously reported for other shrubs, indicating that the pioneer shrub in sand dune environments does not rely more heavily than other plants on the process of resorption to conserve nutrients. Incomplete resorption of nutrients in A. halodendron suggests that senesced-leaf fall would return litter with high quality to the soil, and thereby would indirectly improve soil nutrient availability. The restoration of desertified land, therefore, may be ac- celerated after A. halodendron pioneers into shifting sand dunes.

关键词： foliar nutrient concentration nutrient-resorption efficiency nutrient-resorption proficiency senesced vs. green leaves desertification soil nutrient availability

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Intermediately Complex Models for the Hydrological Interactions in the Atmosphere-Vegetation-Soil System

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Advances in Atmospheric Sciences 2006年第1期23卷 127-140页

作者：曾晓东王爱慧曾庆存 Robert E. DICKINSON Xubin ZENG Samuel S. P. SHEN The University of Arizona Tucson AZ USA University of Alberta Edmonton AB Canada Institute of Biophysics Chinese Academy of Sciences Beijing Institute of Atmospheric Physics Chinese Academy of Sciences Beijing Georgia Institute of Technology Atlanta GA USA

This paper investigates the hydrological interactions in the atmosphere-evegetation-soil system by using the bucket model and several new simplified intermediately complex models. The results of mathematical analysis and numerical simulations show that these models, despite their simplicity, can very clearly reveal the essential features of the rather complex hydrological system of atmosphere-ecosystem-soil. For given atmospheric variables, these models clearly demonstrate multiple timescales, the ＂red shift＂ of response spectra, multi-equilibria and limit cycles, bifurcation, abrupt change, self-organization, recovery, ＂desertification＂, and chaos. Most of these agree with observations. Especially, the weakening of ＂shading effect＂ of living canopy and the wilted biomass might be a major mechanism leading to the desertification in a relatively short period due to overgrazing, and the desertification in a relatively long period or in climate of change might be due to both Charney＇s mechanism and the shading effect. These ideas could be validated with further numerical simulations. In the paper, some methods for improving the estimation of timescales in the soil water evolution responding to the forcing are also proposed.

关键词： Atmosphere-vegetation-soil system hydrological process multi-equilibria chaos desertification shading effect

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Sand stabilization effect of feldspathic sandstone during the fallow period in Mu Us Sandy Land

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Journal of Geographical Sciences 2015年第4期25卷 428-436页

作者： HAN Jichang Shaanxi Provincial Land Engineering Construction Group Co. Ltd. Xi'an 710075 China Key Laboratory of Degraded and Unused Land Consolidation Engineering the Ministry of Land and Re-sources of China Xi'an 710075 China Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China

Depended on the analysis of ground snow situation, soil moisture loss speed and soil structure after planting crops of Mu Us Sandy Land remedied with feldspathic sandstone in the fallow period, it is concluded that feldspathic sandstone mixed with sand improved the sand stabilization in the governance of Mu Us Sandy Land in the fallow period. The sandy land remedied with feldspathic sandstone had big snow coverage, 25%-75% higher than normal sand; soil moisture losses slowed down, and moisture content rose by over 3 times; soil structure had been improved, and water stable aggregate content increased by 6.52%-18.04%; survival rate of protection forest increased to 85%; and ground flatness is less than 1%. The above conditions weakened sand rising conditions of Mu Us Sandy Land in the fallow period and formed two protective layers of snow cover and soil frozen layer under cold weather so as to prevent against wind erosion.

关键词： feldspathic sandstone sand stabilization Mu Us Sandy Land desertification land consolidation

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