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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (2): 613-618    DOI: 10.7522/j.issn.1000-694X.2013.00084
    
The Vegetation Evolution in the Middle and Lower Reaches of the Shiyanghe River Basin, Gansu, China
MAN Duo-qing1, LIU Shi-zeng1, WEI Zhen-hai2, LIU Hu-jun1, LI Yin-ke1, LIU Shu-juan1
1.Gansu Minqin National Observational Station on Desert Steppe Ecosystem, Gansu Desert Control Research Institute, Lanzhou 730070, China;
2.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 733000, China
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Abstract  

We investigated the vegetation evolution in the middle-lower reaches of the Shiyanghe River Basin in Gansu, China, by surveying in field, interviewing the local residents, and reviewing the historical literature. The results showed that, the landscape in the studied area were dominated by lakes and marshlands 2 000 years ago; Later, primarily due to the long term drying of the climate and the strengthening of human activity, the lakes and rivers disappeared gradually, the oasis moved south-eastwards following the change of the river channel; the farmland reclaimed early desertified or covered by desert; the dominant aquatic, marsh and mesophyte populations were replaced by sand xerophyte and super xerophytic species, and a lot of species disappeared; the present major landscape are desert, Gobi and oasis. There flows water all year round in Shiyanghe river in south of the Honyashan Reservoir. Some aquatic, marsh, mesophyte species live in the river beds and wetlands. The biodiversity is also good. In contrast, in the former river beds, there is no flowing water, only some sparse desert plants and xerophytes stand with low biodiversity. Desertification in the area north to the Honyashan Reservoir has been developing seriously. In order to prevent the local environment from continually deteriorating, water introduction from extra area, application of water-saving technology within the studied area, protection to the vegetation and under-ground water should be co-employed.

Key words:  middle-lower reaches of the Shiyanghe River Basin      climate change      landscape      vegetation evolution     
Received:  10 April 2012      Published:  30 May 2012
ZTFLH:  Q948.5  

Cite this article: 

MAN Duo-qing1, LIU Shi-zeng1, WEI Zhen-hai2, LIU Hu-jun1, LI Yin-ke1, LIU Shu-juan1. The Vegetation Evolution in the Middle and Lower Reaches of the Shiyanghe River Basin, Gansu, China. JOURNAL OF DESERT RESEARCH, 2013, 33(2): 613-618.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00084     OR     http://www.desert.ac.cn/EN/Y2013/V33/I2/613

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