中文摘要：

以青海玛多县为例,通过数学模型和因子分析法对黄河源区现代沙漠化过程的影响因素进行了定量分析。基于对该区的实际调查,认为年平均相对湿度、年均气温、年降水量、年均风速、总人口、牲畜数量和工业总产值可能是影响该区沙漠化的因素。1976-1994年期间,研究区沙漠化总面积呈迅速扩展趋势,沙漠化程度呈加重趋势。研究表明：研究区沙漠化总面积扩展的主导因素为人为因素,比重为72%,主要表现为人口压力的增大和工业的发展;沙漠化程度加重的主导因素为自然因素,比重为82%,主要表现为趋于暖干的气候;从沙漠化面积和程度综合考虑,自然因素应为主导因素,比重略大于62%,人为因素略小于38%。

英文摘要：

Taking Maduo County of Qinghai for example,based on mathematical model and the method of factor analysis,the influencing factors of desertification in headwater area of Yellow River have been quantitatively studied.Based on survey,the following seven influencing factors are determined,they are average relative humidity,average temperature,annual precipitation,average wind speed,total population,livestock number and gross industrial output value.The total desertification land had been increasing obviously tendency,and desertification degree had been aggravating tendency during 1976-1994 in study region.The results showed that the contribution of human factor to the increase of total desertification land was 72%,and the human factors mainly presented as the increase of population pressure and the development of industry;the contribution of natural factors to the aggravation of desertification degree was 82%,and the natural factors mainly presented as a climate of trending to warm-dry;Considering the dominant factor from the comprehensive angle（including the increase of total areas and aggravation of degree of desertification land）,the contribution of natural factors was slightly more than 62%,and that of the human was slightly less than 38%.