2009, 28(3) 371-378 DOI:     ISSN: 1004-5589 CN: 22-1111/P

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Keywords
wetland in Nakchu
wetland change
Qinghai-Xizang plateau
driving force
Authors
ZHANG Ji-Cheng-1
JIANG Qi-Gang-2
LI Tao-1
LI Yuan-Hua-2
WANG Kun-2
GUO Jin-Hai-3
PubMed
Article by Zhang, J. C. 1
Article by Jiang, Q. G. 2
Article by Li, T. 1
Article by Li, Y. H. 2
Article by Wang, K. 2
Article by Guo, J. H. 3

Changes of wetland in Nakchu in the last 30 years and analysis of driving forces

ZHANG Ji-Cheng-1, JIANG Qi-Gang-2, LI Tao-1, LI Yuan-Hua-2, WANG Kun-2, GUO Jin-Hai-3

1. National Marine Consulting Center, State Oceanic Adm inistration, Beijing 100860, China; 2. Applied Institute of Remote Sensing, College of Geoexploration and Information Technology, Jilin University, Changchun 130026, China; 3. No.65015 Troop of PLA, Dalian 116023, Liaoning, China

Abstract��

The wetland distribution, area change and driving force have been analyzed by means of RS/GIS, and take 1��100 000 topographic map s of Nakchu, based on aerial photographs in the late 1960 s, remote sensing images of Landsat TM in 1990, Landsat ETM in 2 000 and the 1��250 000 DEM data as main data sources, as well as combined with the temperature and precipitation data in Nakchu. The results indicate the wetland change in Nakchu presented degradation trend from 1970 s. The spatial differences show that the wetland acreage in small-sized faulted lake basin valley areas of western Nakchu was degenerated from 1970 s, while increased in high mountain-wide valley and river source areas of eastern and southern Nakchu during 1970��1990, and decreased after 1990 s. Climatic fluctuations and human activities are also the driving forces of wetland change, and the differences of wetland geological and hydrological factorsmaybe an important reason forwetland change.

Keywords�� wetland in Nakchu   wetland change   Qinghai-Xizang plateau   driving force  
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