• 제목/요약/키워드: Desertification

검색결과 90건 처리시간 0.03초

Early Warning System for Desertification in I. R. of Iran (An Application of GIS and Remote Sensing)

  • Sepehr A.;BodaghJamali J.;Javanmard S.
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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    • pp.189-192
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    • 2005
  • Desertification is one of the main global environmental phenomena. It has resulted in deterioration environment and poor economy, and imposed threat to the surviving environment of the overall mankind. Therefore, creating of methods for monitoring and estimate of risk desertification are necessary. Early warning system is one of important ways for monitoring and forecasting of desertification. Remote Sensing and GIS technology are as suitable tools and methods for early warning system. In this aim, we have evaluated of applications of remote sensing and GIS in monitoring and estimating desertification process (case study in Fars Province of Iran). In this research, we have considered erosion and vegetation cover parameters as main factors affecting in desertification process. The result shows that remote sensing and GIS technology could be useful in evaluation of desertification as one method for desertification early warning. Also, Results suggested that erosion and plant cover are affecting in develop the desertification process in study area.

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사막화방지(沙漠化防止) 및 방사기술개발(防沙技術開發)에 관한 연구(硏究)(I) - 중국(中國)의 사막화현황(沙漠化現況) 및 방지대책(防止對策) - (Studies on the Desertification Combating and Sand Industry Development(I) - Present Status and Countermeasures for the Combating Desertification in China -)

  • 우보명;이경준;전기성;김경훈;최형태;이승현;이병권;김소연;이상호;전정일
    • 한국환경복원기술학회지
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    • 제3권3호
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    • pp.45-76
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    • 2000
  • The purposes of this study were to investigate and understand the present status of various types of "deserts", such as sand desert, gravel desert, rock desert, earth desert, salt desert, desert, rocky desert, gobi desert, sandy desert, clay desert, etc., and the general countermeasures for the combating "desertification" "desertization", and to develop the technologies on the revegetation and restoration for the combating desertification in China. The methods of this study were mainly composed of field surveys on the several experimental sites and research institutes related to combating desertification in China, and examinations on the various technologies for the combating desertification at the Daxing Experimental Station of Beijing Forestry University. The conclusion from this study may be summarized as follows; 1. Status and tendency of desertification in China : China is one of the countries seriously threatened by desertification. Desertification affected areas in China are mainly distributed in arid, semi-arid and dry sub-humid areas in China, covering the most regions of the Northeast China (eastern region of Inner-Mongolia), the northern part of the North China (middle and western region of Inner-Mongolia, Shaanxi, Ningsha, Gansu) and the western part of the Northwest China (Xinzang, Qinghai, Xizang). The total area affected by desertification in China is approximately 2.622 million $km^2$. It covers 27.3% of the total territory of China. Until recently, it is estimated that the annual spreading ratio of desertification in China is 2,460 $km^2$. Therefore, desertification is mostly serious problems facing to the Chinese people. 2. The causes and environmental effect of desertification : The desertification in China is mainly caused by compound factors, including natural condition and human activities. In China, the desertification is started by the decrease of precipitation, continuous dry and drought, strong wind, wind and water erosion, land degradation and loss of natural vegetation caused by climate variation, and accelerated by the human activities, such as over-cultivating, over-grazing, over-cutting of woods, irrational use of water resources. Because desertification has affected the geographical features, soil nutrients contents, salinity, vegetation coverage and the functions of ecosystem, the environmental deteriorations in the desertification affected areas are very seriously. 3. The fundamental strategies of combating desertification in China are the increase of education and awareness of people through various mass media, the revision of laws to guarantee operation of Desertification Combating Law and to improve many relating laws and regulations, the application of advanced technologies and training of experts, the establishment of discriminative policies, and increasing arrangement of budget-investment, and so on. China, as a signed country in UNCCD, has made efforts for the combating desertification. Korea is also signed country in UNCCD, so we should play an important role in the desertification combating projects of China for the northest asia and global environmental conservation as well as environmental conservation of Korea.

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Feasibility of Vegetation Temperature Condition Index for monitoring desertification in Bulgan, Mongolia

  • Yu, Hangnan;Lee, Jong-Yeol;Lee, Woo-Kyun;Lamchin, Munkhnasan;Tserendorj, Dejee;Choi, Sole;Song, Yongho;Kang, Ho Duck
    • 대한원격탐사학회지
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    • 제29권6호
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    • pp.621-629
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    • 2013
  • Desertification monitoring as a main portion for understand desertification, have been conducted by many scientists. However, the stage of research remains still in the level of comparison of the past and current situation. In other words, monitoring need to focus on finding methods of how to take precautions against desertification. In this study, Vegetation Temperature Condition Index (VTCI), derived from Normalized Difference Vegetation Index (NDVI) and Land Surface Temperature (LST), was utilized to observe the distribution change of vegetation. The index can be used to monitor drought occurrences at a regional level for a special period of a year, and it can also be used to study the spatial distribution of drought within the region. Techniques of remote sensing and Geographic Information System (GIS) were combined to detect the distribution change of vegetation with VTCI. As a result, assuming that the moisture condition is the only main factor that affects desertification, we found that the distribution of vegetation in Bulgan, Mongolia could be predicted in a certain degree, using VTCI. Although desertification is a complicated process and many factors could affect the result. This study is helpful to provide a strategic guidance for combating desertification and allocating the use of the labor force.

Landsat 영상자료를 이용한 사막지역의 토지피복 변화 분석 (Detection of Land Cover Change Using Landsat Image Data in Desert Area)

  • 에르덴치멕;최병길;나영우;김태훈
    • 한국측량학회지
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    • 제28권4호
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    • pp.471-476
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    • 2010
  • 본 연구의 목적은 위성영상자료를 이용하여 사막지역의 토지피복상태의 변화를 분석하는데 있다. 따라서 본 연구에서는 위성영상자료를 이용한 사막지역의 토지피복상태를 분석하였다. 이 연구에서는 사막지역의 토지피복상태를 분석하기 위해서 몽골 지역을 연구 대상으로 하고 1991년부터 2007년까지의 Landsat TM과 ETM+ 영상자료를 이용하고 정규화 식생지수 및 무감독분류와 감독분류 방법에 의해 사막지역의 토지피복상태 변화를 분석하였다. 토지피복 상태를 수계, 녹지, 사막지역으로 구분하고 다시 사막지역은 약, 중간, 강 사막지역으로 분류하고 분석하였다. NDVI 지표와 분류된 사막지역 과의 상관관계를 분석함으로써 시간적 변화에 따른 사막화 지역의 토지피복 상태 변화를 분석하고자 한다. 위성영상자료를 이용하여 분석한 결과 사막주변영역에서 녹지는 감소하고 있는 것으로 나타나 사막지역이 확대되고 있는 것을 알 수 있었다.

중국 귀주성 석막화 방지를 위한 실험적 연구 (Experimental Research for Prevention of Stone Hazarding Guizhou, China)

  • 박재현;전재홍
    • 한국환경복원기술학회지
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    • 제11권2호
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    • pp.28-39
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    • 2008
  • This study was conducted to evaluate the rehabilitation measures and select appropriate tree species and rehabilitation methods for rehabilitating the rock desert areas in Guizhou, China. The study was carried out during the periods from 2003 to 2006 and results are as follows. Afforestation site is classified as a dolomite sandstone hilly country, a halfstony hilly country, a karst physiognomy, a rock desertification farmland and an latent rock desertification farmland by soil type and rock desertification status. Total afforestation area of Xuiwen is 1,300ha and afforestation area of a dolomite sandstone hilly country, a halfstony hilly country, a karst physiognomy, a rock desertification farmland and an latent rock desertification farmland are respectively 104.0ha (8.0%), 146.6ha (11.3%), 200.5ha (15.4%), 705.7ha (54.3%) and 143.2ha (11.0%). Planted tree species were selected by five site types. Robinia pseudoacacia, Chamaecyparis obtusa, Thuja orientalis, Cupressus duclouxiana and Juniperus chinensis L. var. chinensis were planted in a dolomite sandstone hilly country and Choerospondias axillaris and Robinia pseudoacacia were planted in a halfstony hilly country. Cupressus duclouxiana, Zanthoxylum bungeanum, Lonicera fulvotomentosa, Ilex kudincila, Quercus aliena, Quercus variabilis, Choerospondias axillaris, Koelreuteria bipinnata, Cryptomeria japonica, Cinnamomum camphora and Cinnamomum bodinieri were planted in a karst physiognomy. Cupressus duclouxiana, Toona sinensis, Robinia pseudoacacia, Lonicera fulvotomentosa, Eucommia ulmoides, Ilex kudincha. Zanthoxylum bungeanum and Magnolia officinalis were planted in a rock desertification farmland. Lonicera fulvotomentosa, Juglans sinensis, Pyrus pyrifolia, Choerospondias axillaris, Prunus salicina and Diospyros Kaki was planted in an latent rock desertification farm land. Robinia pseudoacacia showed high survival rate in 2004 and 2005, but Zanthoxylum bungeanum and Cinnamomum camphora showed slightly low survival rate in 2004. Survival rate of planting species in 2005 was over 80% because some species which showed low survival in 2004 were changed with other species and a proper afforestation method was applied. Growth rate of tree species was evaluated by height and diameter growth rate. Cupressus duclouxiana showed a highest height growth rate in 2004. Toona sil1ensis, Choerospondias axillaris, Koelreuteria bipinnata, and Cinnamomum camphora showed almost 100% height growth rate in 2005, although they showed a negative height growth rate in 2004. Robinia pseudoacacia showed a good growth rate in the rock desertification farmland and the halfstony hilly country so it could give a commercial benefit like honey as well as an afforestation effect.

중국 내몽고 동부지역의 토지이용 변화와 사막화 -커얼친 사지의 사례 - (The Land Use Change and the Desertification in the East Inner Mongolia, China - A Case Study on Horqin Desert -)

  • 이강원
    • 대한지리학회지
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    • 제40권6호
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    • pp.694-715
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    • 2005
  • 이 논문은 중국의 반건조지대에 위치하는 네이멍구 동부의 커얼친 사지를 사례로 토지이용의 변화와 사막화의 전개에 대하여 검토하고 있다. 이 지역의 토지이용의 변화는 경지와 목축두수의 증가로 요약되며, 그에 따른 물과 식생의 이용 및 관리에 있어서의 문제점들이 사막화를 촉진시킨 것으로 나타났다. 사막화의 전개 유형은 이동사구 확대 유형, 하안 유사 확대 유형, 촌락 주변 반점상 유사 확대 유형, 초지와 경지 중의 반점상 유사 확대 유형으로 구분할 수 있었다. 토지이용 변화의 배경에는 1949년이래 사회주의 건설과 개혁개방으로 요약되는 사회적 변화가 자리 잡고 있다. 특히 대약진운동과 문화대혁명이라는 두 가지 정치적 운동과 개혁개방으로 인한 농민과 목축민들의 수익추구가 이 지역의 토지이용에 미친 영향이 컸다. 1990년대를 전후하여 사막화에 대한 각성과 더불어 여러 가지 사막화 예방 및 퇴치 정책들이 실시되고 있다. 그러나 이러한 정책들은 개방화 및 시장화라는 추세, 이 지역 농민들과 목축민들의 생존권과 수익, 그리고 무엇보다도 1949년 이후 이 지역에 고착된 교란된 인구구조와 그에 따른 토지이용체계에 의해 제약받고 있다.

Spectral Mixture Analysis for Desertification Detection in North-Eastern China

  • Yoon Bo-Yeol;Jung Tae-Woong;Yoo Jae-Wook;Kim Choen
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2004년도 Proceedings of ISRS 2004
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    • pp.419-422
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    • 2004
  • This paper was carried out desertification area change detection from 1980s to 2000s per unit decade using by multitemporal satellite images (Landsat MSS, TM, ETM+). This study aims to use Spectral Mixture Analysis (SMA) to identify and classify study area. Endmembers is selected bare soil, green vegetation (GV), water body using by Minimum Noise Fraction (MNF). Endmembers used to generate increase and decrease images respective from 1980s to 1990s and from 1990s to 2000s. From the analysis of multitemporal change detection for three periods, it was apparent that the area of bare soil increased significantly, with simultaneous decrease of GV and water body. The multitemporal fraction images can be effectively used for change detection. Though there is no field survey dataset, SMA is reliable result of change detection in desertification in China.

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중국 내몽고 초원의 위기와 사막화 논쟁 -초원목계(草原牧鷄)가 등장하기까지- (Crisis Construction in the Inner Mongolia Grassland and the Controversy of Desertification: The Emergence of Grassland Chicken Farming)

  • 이선화
    • 대한지리학회지
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    • 제47권6호
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    • pp.836-852
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    • 2012
  • 이 연구는 중국 내몽고에서의 사막화 방지를 위한 제안과 실천의 변화과정을 기술 분석하였다. 사막화라는 생태문제는 자연적인 것만으로도, 사회적인 것만으로도 환원될 수 없는 다양한 인간과 비인간 행위자들의 구성과정의 결과물이다. 사막화 방지 제안들 속에는 사막화를 정의하기 위해 관계를 맺고 있는 여러 행위자들이 등장하고 있다. 이 행위자들의 차이 그리고 이들의 관계의 차이를 통해서 초원의 위기는 달리 구성되어 왔다. 조림사업, 보호구역, 휴목 금목, 젖소의 도입 등 기존에 내몽고에서 이루어졌던 사막화 방지 제안들은 각기 다른 행위자들의 이해관계를 조율하면서 사막화 방지라는 목적을 달성하기 위해 노력하였지만 한계가 지적되었다. 이러한 위기 구성의 역사에서 가장 마지막에 등장한 초원목계 프로젝트는 '닭'이라는 새로운 행위자의 매개를 통해, 몽고족 목축민의 경제적 위기를 해결하지 못했던 기존의 한계를 극복하는 혁신적인 시도가 되었다.

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위성영상기반 튀니지 사막화 모니터링 및 평가에 관한 연구 (A study for Desertification Monitoring and Assessment based on satellite imagery in Tunisia)

  • 김지원;송철호;박은빈;이종열;최솔이;이은정;이우균
    • 한국지리정보학회지
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    • 제21권4호
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    • pp.91-107
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    • 2018
  • 최근 튀니지는 국토 남쪽의 사하라 사막이 북상하는 추세로 사막화 모니터링과 평가가 요구되고 있다. 본 연구에서는 원격탐사 자료를 활용하여 토지피복 변화를 관찰하고, 정규화식생지수, 표토입자크기지수, 알베도를 산출하여 튀니지의 사막화를 모니터링하였다. 또한, 평가 지표 간 우선순위를 파악하여 Decision Tree (DT)를 구성하였고, 각 사막화 평가 지표, 사막화 등급, 토지피복의 변화빈도와 경향을 확인하였다. 이후, 연구에서 활용한 세 평가 지표와 강수량 간의 상관관계 분석을 수행하였다. 빈도와 경향 분석결과, 튀니지에서는 사막화가 전반적으로 심화되고 있으며, 사막화 정도가 심한 지역이 지리적으로 북상하는 것으로 나타났다. 사막화 평가 지표와 강수량의 상관관계 분석을 시행한 결과, 세 지표 모두 강수량과 높은 상관관계를 갖는 것으로 나타나 강수량의 변화가 튀니지 사막화에 영향을 주고 있음을 확인하였다. 본 연구를 통해 위성영상에 기반한 사막화 지표와 이를 조합하여 평가하는 방식인 Decision Tree, 그리고 토지피복 변화 경향을 고려하는 다양한 방법론의 활용성이 제고되었다.

The Performance Analysis of Korean NGOs' Tree Plantation Projects in Mongolia

  • Kang, Min-Kyung;Park, Dong-Kyun;Chun, Young-Woo
    • 한국산림과학회지
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    • 제99권5호
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    • pp.655-662
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    • 2010
  • Desertification has been expanding with a remarkable speed across the Northeast Asia. Desertification in Northeast Asia significantly influences Korea's economy and environmental health conditions in recent years. For these reasons, a number of non-governmental organizations (NGOs) in Korea have carried out the reforestation projects to combat desertification in China and Mongolia. Several tree plantation projects were implemented in Mongolia and China. The objective of this study was to analyze and evaluate the performance of tree plantation aid projects carried out by Korean NGOs in Mongolia. The performance of tree plantation projects was examined through effectiveness, efficiency, equity and responsiveness of those projects. The performance was analyzed with the survival rate of planted trees and planting cost, the recognitions of Mongolian people. The analysis of the performance showed that the tree plantation cooperation projects carried out by Korean NGOs in Mongolia had comparatively high performance from a larger point of view. Especially, effectiveness and responsiveness of their projects were highly marked in spite of all the difficulties of carrying out the tree plantation. Such a high effectiveness represented the relatively higher survival rates of trees and Mongolian's positive recognition of plantation projects. Furthermore, the responsiveness also turned out to be high with a great satisfaction of the Mongolian people for plantation projects conducted by the Korean NGOs. Survey results indicated that the efficiency and equity of the projects would be increased by promoting the cooperation projects for tree planting throughout Mongolia with reinforcing infrastructures. By comparison between Korean NGOs and Mongolian Government plantation projects, confirmed the importance of sustained financial support and maintenance activities in the plantation sites.