Desertification dynamic change trend and quantitative analysis of driving factors of alpine meadow in Maqu County in the First Meander of the Yellow River

Abstract

Abstract: Based on the remote sensing and GIS technology and the methods of remote sensing dynamic monitoring, data interpretation combined with field investigation, the desertification space-time evolution process and its development trend of Maqu alpine meadow (Gansu) in recent 35 years was analyzed according to the selection of remote sensing image in 1975, 1990, 1994, 2000, 2005 and 2009, and integrated the topographic map, desertification monitoring data of each period and data of land use map. Based on this basis, the desertification drive factors are quantitatively identified and analyzed on contribution rate according to the grey correlation degree analysis method. The results show that, 1) the desertification in the research area showed a continuous expansion trend followed by time changes, and this trend developed a process of slow development→slight decrease→fast development. Mobile sand dunes developed a process of low development→rapid development→reverse, semi-fixed sand dunes developed a process of low development→rapid development→rapid reverse and fixed sand dunes showed a trend of slow development→reverse→rapid development. The spatial pattern of the desertification land distribution area showed an expanding situation and the desertification degree showed a trend of reducing volatility along the Yellow River. 2) the correlation order of driving factors and desertification land area is: GNP>number of sheep of each year>population>mean annual temperature>animal output value>mean annual precipitation>number of large animals of each year>mean annual evaporation>beef and mutton production>aridity index>runoff volume of the Yellow River>average wind speed; the driving force natural and human factors on the proportion of desertification land area were 40.43% and 59.57%, respectively. These results showed that abnormal disturbance of climatic warming was induced and the secondary factors which lead to grassland desertification, human irrational activities was the strengthened and leading factors which accelerated the land desertification development and the expansion of grassland desertification in the research area is the integrated process which is combined with action and influence of the two kinds of factors.

CLC Number:

S812.29

CHEN Wen-ye, ZHANG Jin, QI Deng-chen, ZHAO-ming, ZHANG Ji-qiang, LI Guang-yu, WEI Qiang, WANG Fang, ZHU Li, LIU Zhen-heng, SUN Fei-da, KANG Jian-jun, LUO Wen-li. Desertification dynamic change trend and quantitative analysis of driving factors of alpine meadow in Maqu County in the First Meander of the Yellow River[J]. Acta Prataculturae Sinica, 2013, 22(2): 11-21.

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