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Search Results: 1 - 10 of 5825 matches for " land desertification "
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Evaluating the Role of Shelterbelt in Vegetation Development in a Semi Arid Zone of Yobe State, Nigeria  [PDF]
Bulus Luka Gadiga, Yakubu Dan
Journal of Geographic Information System (JGIS) , 2015, DOI: 10.4236/jgis.2015.75043
Abstract: This study evaluates the role of shelterbelts on the development and dynamics of vegetation in relation to livelihoods in the study area using geo-information techniques. The study covered the period between 1972 and 2007. The results show that in 1972 vegetation cover in the study area extended over an area of 6955 hectares (i.e.shrubs, grasses and trees) which represents 65% of the area; however there was a decrease in 1986 to an area of 5779 hectares (54%). Despite the establishment of shelterbelt in the area in 1987, the trend did not change. This is obvious in the reduction of vegetation cover between 1986 and 2000 to a total area of 3893 hectares (37%). The vegetation cover further decreased to 2791 hectares (26%) in 2005 and 1659 hectares (16%) in 2007 respectively. The study concludes that the establishment of shelterbelts alone cannot guarantee the success of vegetation cover development in the area without a sustainable plan which recognizes the local communities as critical stakeholders. Thus, variables like population growth and GDP have a role to play in vegetation cover depletion. The study recommends that efforts geared towards enlightenment of the local communities on the need for conservation should be encouraged by Government and Non-Governmental Organisations.
Mechanism and regulation of land degradation in Yulin district

LIU Yansui,ZHANG Xiaoping,LI Xianwen,Jay Gao,

地理学报 , 2003,
Abstract: Yulin district is located in the transitional zone between Mu Us Desert and Loess Plateau of northern Shaanxi Province, thus it is particularly vulnerable to degradation due to its fragile ecosystem and intense human activities there. The purpose of this study is to explore the mechanism, process and driving force of land degradation in area with vulnerable eco-environment within the context of increasing population and intensifying human economic activities, and then find out the patterns and countermeasures of how to control them using the economic and technological ways. In detail, this study includes three main sections: the first section analyzes the mechanism, causes and characteristics of land degradation, which can be achieved by the typical field investigations and systematical analysis within the regional natural, social and economic context. Based on the technologies of remote sensing and GIS, and combined with the modeling methods, the second section reveals the change characteristics of land use and its driving force from 1990 to 2000; As to the third section, feasible countermeasures of how to prevent the degradation and rehabilitate the regional ecology are proposed, which are studied from the perspective of harmony between nature and economy, and the conception of regional sustainable development.
Desertification Reversion in Relation to Land Use Change and Climate in Naiman County, Inner-Mongolia, China

XueYong Zhao,XiaoAn Zuo,Gang Huang,YingXin Huang,ShaoKun Wang,YaYong Luo,WenDa Huang,Hao Qu,Wei Mao,Jie Lian,

寒旱区科学 , 2010,
Abstract:
Climate Change and Impact of Desertification or Soil/ Land Degradation in Turkey, Combating Desertification
C. Cangir,D. Boyraz
Journal of Tekirdag Agricultural Faculty , 2008,
Abstract: The total arable land of Turkey is about 28,054,000 ha. The main income of the country is agriculture and agriculture based industry. However, the prime soils cover only 17.5% of the total land surface and the productivity of the rest of the soils is limited by topographical, chemical (e.g. high calcium carbonate content, alkalinity and low organic matter), and physical (e.g. water logging, texture) attributes. The diverse topography along with deforestation and unsuitable tillage and irrigation management has been inducing the rate of erosion in the country for centuries. The majority of the country’s soils (76.5%) are prone to erosion risk due to the dominant steep slopes (>6%), and 72% of the soils are more or less affected from water and wind erosion. Alongside these unsuitable conditions, the misuse of lands, i.e. soil sealing, soil exploitation, over use of fertilizers and irrigation, improper use of indigenous environmental friendly, agro-ecosystems, constantly degrade the soils of the country. Soils with high production capacity and with a wide range of agricultural uses, cover 7% (about 5 million ha) of the total land area (77.9 million ha) of Turkey. This proportion is equal to about 1/5 of the potential agricultural soils of the country. The highly to moderately productive soils (soils of Land Capability Class I, II, III) comprising an area of 19.1 million ha, with none (LCC I) to one or more moderate to severe limitations (LCC II and III) for some uses, require some kind of conservation practices to assure stability and sustainability of production as the essential part of the management system. Permanent limitations as water logged conditions as well as salinity would demand expensive investments in land management particularly for LCC III soils. This is almost equal to 1/4 (25%) of the country's land. However, there are 7.4 million ha land which is marginally productive (LCC IV), where parts of this is currently used for cultivation, pastures, forests and settlement areas, which cover about 4.9 million ha. About 573 000 ha of land is occupied by various industries and urban settlements, most of which is of Prime Quality (LCC I) and larger than the cultivated soils of many townships. Land with increased erosion due to misuse -unplanned- is about 6.2 million ha and the total non-arable (unsuitable for cultivation) (LCC V, VI, VII) land is 6.3 million haLand/soil degradation and natural resources degradation should be included in the concept of “desertification”. In this framework, there are three major causes for the occurrence of desertific
Fungos micorrízicos arbusculares como indicadores da recupera??o de áreas degradadas no nordeste do Brasil
Carneiro, Romero Francisco Vieira;Cardozo Júnior, Francisco Marques;Pereira, Lucimária Farias;Araújo, Ademir Sérgio Ferreira;Silva, Gladstone Alves;
Revista Ciência Agron?mica , 2012, DOI: 10.1590/S1806-66902012000400005
Abstract: attributes of arbuscular mycorrhizal fungi (amf) were evaluated in a region in the process of desertification at gilbués, piauí, brazil, with the objective of monitoring areas with different levels of soil degradation and recovery. soil samples were collected at a depth of 0 to 0.2 m during the dry season of 2009 in four areas of ultisol, which were visually defined as: rec - an area under recovery by erosion contention and the planting of exotic grasses and legumes; deg- an area with high degradation; ideg - an area with moderate degradation; mn - an area of native vegetation. the following were analysed: root colonization, the most probable number of infective propagules (mpn), diversity indices (the shannon-wiener index, the simpson diversity and dominance indices, the pielou equitability index and the margalef index) and the soil chemical attributes of ph, h+al, phosphorus and organic matter, used as explanatory variables for the variability of the amf attributes by multivariate analyses. root colonization and propagule mpn were higher in the rec area. the shannon-wiener index, the simpson dominance index and the margalef index were lower in the deg area, showing that they are good indicators of changes in the amf community in degraded areas. by hierarchical cluster analysis, the deg area showed higher dissimilarity in relation to the other areas. by principal component analysis, the shannon-wiener index, the margalef index and the simpson dominance index, and the phosphorus levels were the parameters that best explained the total variation.
Carbon and nitrogen mineralization in soils along a desertification gradient in the semiarid Horqin Sandy Land, Northern China

YuQiang Li,HaLin Zhao,TongHui Zhang,YuLin Li,XiaoAn Zuo,

寒旱区科学 , 2010,
Abstract:
Analysis and assessment of land desertification in Xinjiang based on RS and GIS

LI Hu,WANG Xiaofeng,GAO Yaqi,

地理学报 , 2004,
Abstract: The land desertification in Xinjiang was monitored and analyzed based on RS and GIS techniques. Satellite data interpretation was adopted to obtain the general situation of Xinjiang's land desertification in assistance with the sampling method and on-the-spot investigations. Related monitoring and investigations showed that Xinjiang was facing with severe wide range land desertification, and its desertified area made up 77.08% of the total monitoring area. As for land types, the desertified farmland accounted for 1.92% of the total monitoring area, desertified woodland 4%, desertified grassland 45%, and unused land 49%. Accordingly, as for desertification degrees, non-desertified land occupied 22.92%, weak desertified land 5.69%, medium-degree desertified land 16.58%, severe desertified land 33.19% and super severe desertified land 21.61%. Finally, as for inducing factors, wind-eroded desertification made up 58.23%, water-eroded desertification 8.69%, salinization desertification 6.52% and frozen-melt eroded desertification 3.64%. Xinjiang's land desertification tended to get worse and the harnessing mission remained hard.
FOREST FRAGMENTATION, URBANIZATION AND LANDSCAPE STRUCTURE ANALYSIS IN AN AREA PRONE TO DESERTIFICATION IN SARDINIA (ITALY)
Francesca Giordano,Marzia Boccone
Present Environment and Sustainable Development , 2010,
Abstract: Land degradation and desertification processes represent a serious problem in many Italian regions, as in Sardinia (Italy), and in particular in the northwestern part of the island (Nurra region) where urbanization, overgrazing and fires have induced environmental degradation and rapid land-use change. The purpose of the study was to analyse in depth the forest fragmentation process and the landscape dynamics occurring over the 28-years period between 1972 and 2000 in an area prone to desertification in Sardinia. In this study, using satellite remote sensing, Geographical Information System and the software FRAGSTATS three Landsat satellite images were classified into seven land cover types and a stepwise indicator approach was adopted. The results have enabled the identification of areas in which specific spatial patterns occurred at some degree of intensity as degradation factors,thus explaining, at least in part, the sensitivity to desertification of specific areas.
Fuzzy Comprehensive Evaluation-Based Disaster Risk Assessment of Desertification in Horqin Sand Land, China
Yongfang Wang,Jiquan Zhang,Enliang Guo,Zhongyi Sun
International Journal of Environmental Research and Public Health , 2015, DOI: 10.3390/ijerph120201703
Abstract: Desertification is a typical disaster risk event in which human settlements and living environments are destroyed. Desertification Disaster Risk Assessment can control and prevent the occurrence and development of desertification disasters and reduce their adverse influence on human society. This study presents the methodology and procedure for risk assessment and zoning of desertification disasters in Horqin Sand Land. Based on natural disaster risk theory and the desertification disaster formation mechanism, the Desertification Disaster Risk Index (DDRI) combined hazard, exposure, vulnerability and restorability factors and was developed mainly by using multi-source data and the fuzzy comprehensive evaluation method. The results showed that high risk and middle risk areas account for 28% and 23% of the study area, respectively. They are distributed with an “S” type in the study area. Low risk and very low risk areas account for 21% and 10% of the study area, respectively. They are distributed in the west-central and southwestern parts. Very high risk areas account for 18% of the study area and are distributed in the northeastern parts. The results can be used to know the desertification disaster risk level. It has important theoretical and practical significance to prevention and control of desertification in Horqin Sand Land and even in Northern China.
LAND RESTORATION IN CHINA
我国的土地恢复

Guo Huancheng,
郭焕成
,吴登茹,朱宏星

生态学报 , 1990,
Abstract: China is a densely populationed and fairly limited farmland which is unevenly distributed. Owing to irrational utilization, land desertification, the less of water and soil erosion, land salinization, and land mining derelicition have been inflicting great havoc in some areas of China. At present,the derelict land by miners has been up to 0.2 million ha.In order to prevent land destruction and conserve farmland, the measures should be taken are to construct wind-proof and sand-fixed forest belts in the North-westen arid and semi-arid regions,and to develop appropriate irrigation in the plain regions, to plant trees and sow grass in the mountain areas. The means of land restoration on dereliction land is planting trees and sowing grass, reforming farmland, or other land use types.
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