Full text: Mapping without the sun

-Take Qinghai Lake Areas as an example 
Jian Ji a ” b *, Chen Yuanyuan 3 , Yang wunian 3 , Tang nengfu 3 
institute of RS and GIS, Chengdu University of Technology, Chengdu, China,610059 
international Institute of Earth System Science, Nanjing University, Nanjing,China, 210093 
KEY WORDS: Land Sandy Desertification, Remote Sensing, ASTER, Qinghai Lake Areas 
The Qinghai Lake is the biggest salt lake in China, which is also a famous marsh in world. However it is sharply become depravation 
because of the land sand desertification in the surrounding areas. In this paper, the basic natural, social and economic features were 
elected to be analyzed in the area to assess land desertification in Qinghai lake areas at first; then the environment background of land 
sandy desertification was specified; at last, the authors made an integrative assessment and discussion on land sandy desertification in 
Qinghai lake areas with MSS and ASTER satellite image. 
Land Sandy Desertification does many harm to human beings, 
it not only intimidates the environment, but also has grievous 
effects on survival of man as well as sustainable development 
of circumstance and society. For example, the granule’s 
declining and thick grain’s creasing in the substance on the 
earth, nutrient decreasing in soil and fertility declining and 
productivity decreasing of soil are all effected by it(Liu 
China is a grave Land Sandy Desertification country, who has 
334,000km 2 desert land,37,000 km 2 sand land and 1,162,000 
km 2 Gobi sand land, with the proportion of 15.9% in this 
country. Land Sandy Desertification bring serious zoology and 
social effect in this country, the more and more sand storm in 
this country is a significant example!Wang Tao, Zhao 
Halin,1999, Wang Tao, et al,1998, Cha Yong, et al,1997, Dong 
Yuxiang, 1995). 
The Qinghai Lake, located in the northeast of Qingzang 
tableland, is the largest inland salty lake and famous marsh in 
the world. By far, around the Qinghai Lake, sand area has 
increased to 403 hm 2 and the natural shrub area has decreased 
from 34 hm 2 to 14 hm 2 . At the same time, in-flood water has 
decreased 60% since 1950s.There is 140 thousand km 2 
degeneration grass around Qinghai Lake, with the area account 
to 34.9% of the total grass land. The area of sand has reached to 
765 km 2 , at the speed of more than 10 km 2 every year. 
By the research on the Land Sandy Desertification around 
Qinghai Lake, the paper attempt to give a general evaluation on 
the mechanism of the Land Sandy Desertification, and bring 
forward some scientific suggestions. 
Qinghai Lake. This paper do the research on the situation of 
vegetation distribution around the Qinghai Lake, the Buha Lake, 
the Jimen River, the Jun Rive, the Shaliu River and Qilian 
mountain chain. 
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2.1 Study Area 
The Qinghai Lake locates in the north of Qinghai province of 
China, with the scope of north latitude 36°50’—37°30’and east 
longitude 99°10’—99°50’, it is the biggest slight salt tableland 
inland lake in the country with the area of 4304.5km2.The 
average depth of the lake is 21m. Figure 1 is the sketch map of 
Figure 1. Location of Study Area 
The study area has the following Characters: 
• Physiognomy: the hypsography is high in the northwest 
and low in the southeast, and the physiognomy type is 
mainly Lake shore ladder land, constructed tableland, 
denudation hilly-land and so on. 
• Climate: The climate belongs to the tableland mainland 
climate, which is cool, dry windy> Air temperature 
rather low > obvious difference in region n cool in 
Corresponding author. E-mail:jianji@21cn.com

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