ORIGINAL RESEARCH
Research on Holocene Loess Erosion Associated to Climate Evolution in China
Chen Yao 1, 2  
,  
Huo Wuxing 3  
,  
Qian Hui 1, 2  
,  
Li Bingcheng 1, 2  
 
 
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1
School of Environmental Science and Engineering, Chang’an University, Xi’an, China
2
Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of the Ministry of Education, Chang’an University, Xi’an, China
3
School of Highways, Chang’an University, Xi’an, China
CORRESPONDING AUTHOR
Chen Yao   

Key Laboratory Subsurface Hydrology and Ecological Effects in Arid Region (Chang\'an University), Ministry of Education, School of Environmental Science and Engineering, Chang’an University, Xi’an 710054, Shaanxi, China, 710054 Xi’an, China
Online publish date: 2019-08-02
Submission date: 2018-10-08
Final revision date: 2018-11-12
Acceptance date: 2018-11-22
 
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ABSTRACT
Loess is the carrier for the Chinese nation’s survival, and we can accurately know its erosion changes since the Holocene, the current period of geologic time, which is very important to predict future trends. However, there is very limited quantitative research on Holocene climate change and loess erosion intensity. This research takes the Holocene loess depositional sequence of Shaolingyuan in Xi’an at southern loess plateau as the research object to analyze the magnetic susceptibility and stratigraphic age structure of sedimentary sequences, and describe the climate change in different periods. This method uses the sensitivity of pedogenes and fits the precipitation and temperature equation to quantitatively reconstruct the paleoprecipitation and paleotemperature changes since the Holocene, which determines the relationship between soil erosion intensity and precipitation in order to estimate soil erosion intensity since the Holocene period. Results show that the climate change in Xi'an is as follows: 10000~8400 a B.P. is the cold temperature transition stage; 8400~7000 a B.P. is the warm-cold fluctuation stage; 7000~5000 a B.P. is the warm temperature stage; 5000~3400 a B.P. is the warm-cold violent fluctuation stage; and 3400 a B.P. is the warm-semi-humid and semi-arid stage. The Holocene soil erosion intensity changes with annual average precipitation. At 9700 a B.P., the annual average rainfall is 676.6mm, the Estimate of soil erosion intensity reaches its peak value (1287.7 Mg·km−2·a −1), and the soil erosion intensity will become more serious for some time in the future. This research proposes a new method for estimating soil erosion intensity changes caused by climate change, which not only infers the relationship between soil erosion intensity and climate change, but also provides a theoretical basis for accurately processing the soil and water conservation works in the loess area.
eISSN:2083-5906
ISSN:1230-1485