Abstract：[Background] The development of desertification in Hunshandake sandy land seriously endangers the ecological environment and obstructs the sustainable development of economy, the control of desertification is urgent, it is of great significance to study the changing process and main causes of desertification in order to control desertification. Therefore, taking Zhenglan banner in the hinterland of sandy land as the study area to accurately analyze the process and causes of desertification change in this area would provide the basis for desertification control and ecological environment restoration in Hunshandake sandy land.[Methods] LandsatTM/OLI remote sensing image from 1985 to 2015 in the study area were used to calculate the normalized difference vegetation index and to construct the desertification index based on normalized difference vegetation index, the temporal and spatial variation of desertification index was analyzed using the index classification method,Theil-Sen trend analysis method and Mann-Kendall test method. Then based on the annual precipitation, annual average temperature from 1985 to 2015 in the study area, spearman grade correlation method was applied to analyze the spatio-temporal difference of the driving effect of meteorological factors on desertification. The influence of human activities on desertification was analyzed by using socio-economic data.[Results] 1) The desertification in the study area has expanded and aggravated in the past 30 years, and experienced 4 evolution in the process. From 1985 to 1989,desertification began to expand in the west and the degree of desertification increased; from 1989 to 2000, desertification continued to expand but the severity decreased; from 2000 to 2004, desertification shrank, the degree of desertification alleviated; from 2004 to 2015, desertification was reversed, the degree of desertification increased, and the degree of desertification expanded again. 2) From 1985 to 2015, the dominant trend of desertification in Zhenglan banner was non-significantly changed, its area reached 69.92% of the total desertification,and between the significantly change trends, the upward trend was mainly located in the east, its area reached 18.46%,the downward trend mainly located in the west, its area reached 11.62%. 3) The correlation between climate and desertification is mainly non-significantly correlation in space, which indicated that climate was not the most important influencing factor for the change of desertification in this area,the main factor was human activity.Therefore, the desertification change in Zhenglan banner was the result of the superposition of climate and human activities, especially animal husbandry. there are temporal and spatial differences in the superposition effects of climate and human activities.[Conclusions]The main reason for the increase of desertification in Zhenglan banner in the past 30 years is human activities, thus human activities should be restricted under the current unfavorable climate conditions, so as to achieve the purpose of ecological control.
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2019, Vol. 17 
