Assessing the relative role of climate change and human activities in sandy desertification of Ordos region,China |
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| Authors: | DuanYang Xu XiangWu Kang ZhiLi Liu DaFang Zhuang JianJun Pan |
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| Institution: | (1) College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China;(2) Institute of Scientific and Technical Information of China, Beijing, 100038, China;(3) The National Meteorological Center, Beijing, 100081, China;(4) Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China |
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| Abstract: | Climate change and human activities are driving forces of sandy desertification and the relative role of them in sandy desertification
is the hot point in related researches. A study was carried to assess the relative role of climate change and human activities
in sandy desertification of Ordos region in China. Potential NPP and the difference between potential and actual NPP were selected as indicators to assess the relative role of climate change and human activities in sandy desertification,
respectively. Assessing methods were built based on some scenarios for the reversion and expansion of sandy desertification
and the relative role of climate change and human activities in sandy desertification of Ordos region were assessed from 1981
to 2000. The results showed that although some local places experienced an expansion of sandy desertification, the change
of sandy desertification of Ordos region from 1981 to 2000 showed a stably reversing trend. The relative role of climate change
and human activities in sandy desertification of Ordos region varied at different temporal and spatial scales in the reversion
and expansion processes. In the reversion of sandy desertification, climate change was the dominant factor in the period of
1981 to 1990 and the reversed areas mainly induced by climate change including Mu Us sandy land and the transition zone between
temperate steppe and temperate deciduous scrubs in north east of Ordos region; however, human activities controlled the reversed
process during the period from 1991 to 2000 and the areas mainly induced by human activities distributed in all banners of
Ordos region. In the expansion of sandy desertification, human activities were the dominant factor in the period of 1981 to
1990 and the expanded areas mainly included the regions around common boundary of Hanggin, Dalad Banners and Dongsheng City;
however, climate change dominated the expansion of sandy desertification from 1991 to 2000, the expanded areas equably distributed
in the whole of Ordos region except the south east of Otog Qian, Uxin and Jungar Banners.
Supported by Chinese National Academic Institutional Commonweal Research Programs (Grant No. 2005DIA3J006) |
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| Keywords: | Ordos causes of sandy desertification climate change human activities relative role NPP |
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