草业学报2013，Vol.22Issue(2)：11-21,11.
黄河首曲—玛曲县高寒草甸沙化动态演变趋势及其驱动因子定量分析
Desertification dynamic change trend and quantitative analysis of driving factors of alpine meadow in Maqu County in the First Meander of the Yellow River
摘要
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 developments→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.关键词
黄河首曲/玛曲/高寒草甸/沙化/动态演变/驱动因子Key words
the First Meander of the Yellow River/ Maqu/ alpine meadow/ desertification/ dynamic change trend/ driving factor分类
农业科技引用本文复制引用
陈文业,张瑾,戚登臣,赵明,张继强,李广宇,魏强,王芳,朱丽..黄河首曲—玛曲县高寒草甸沙化动态演变趋势及其驱动因子定量分析[J].草业学报,2013,22(2):11-21,11.基金项目
林业公益性行业科研专项项目(201004045),国家"十一五"科技支撑计划项目(2009BAC53B05),甘肃省技术研究与开发专项计划项目(0805TCYA020)和甘肃省科技重大攻关项目(2GS063-A31-010)资助. （201004045）
