[1]FENG Jian-min,LI Xiao-hua.Dynamic Changes of Sandy Desertification and Its Causes in the Gonghe Basin During the Last 15 Years[J].Research of Soil and Water Conservation,2010,17(05):129-133.
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Dynamic Changes of Sandy Desertification and Its Causes in the Gonghe Basin During the Last 15 Years
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
17
Number of periods:
2010 05
Page number:
129-133
Column:
Public date:
2010-10-20
- Title:
- Dynamic Changes of Sandy Desertification and Its Causes in the Gonghe Basin During the Last 15 Years
- CLC:
- X171.1
- DOI:
- -
- Abstract:
- Based on the field investigation and summarizing experiences from other studies, this article taking the Gonghe basin as the study area, established classification and interpretation criterions of sandy desertified land, detected spatial-temporal evolution of desertification from 1990 to 2005 in the study area through visual interpretation of Landsat TM images, with the support of geographic information system (GIS), and analyzed its causes. The results showed that: ① The sandy desertified land of the study area was 7 419.62 km2 in 2005, occupying 62.84% of the whole region, and the most is in light and middle grades. ② Although desertification takes place in the whole region, it is the most severe in the south and middle district with high annual mean temperature. ③ The dynamics of land sandy desertification are decreasing on the whole, reversing and developing in local, and the desertification degree is becoming intensifying. ④ Although increasing of evaporation resulted from climate change promotes sandy desertification, the abrupt reduction of farmland and agricultural population since 1996 are the important anthropogenic factors of decreasing land sandy desertification. ⑤ Sandy desertification in the study area was in a dynamic change progress with slight change, but not basically controlled. Therefore, it is imperative to control agricultural population and livestock increase speed, to adjust the land use structure and to reform the land use system, to enhance the management of land resource, and to strengthen the eco-environment construction.
- References:
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1900-01-01