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›› 2017, Vol. 40 ›› Issue (2): 355-364.

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Relationship between color index of modern surface sediment and climate parameters in the region of Xinjiang and Qinghai

YAN Yong-yao1,2, AN Cong-rong3, MIAO Yun-fa1, SONG You-gui4, YANG Shen-li5, CAI Xiao-min1,2   

  1. 1. Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. School of Geosciences, China University of Petroleum(East), Qingdao 257061, Shandong, China;
    4. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, Shanxi, China;
    5. Northwest Institute of Eco-Environment and Resources, Lanzhou University, Lanzhou 730000, Gansu, China
  • Received:2016-09-21 Revised:2016-12-25 Online:2017-03-25

Abstract: In order to better understand the relationship between color index of modern sediment(brightness L*, redness a* and yellowness b*)and climate parameters(the annual average temperature and annual average precipitation), 104 surface sediment samples were collected at a large scale in the region of Xinjiang and Qinghai. These samples were analyzed by combining the spatial econometric and traditional statistical approachs to explore their trend and local spatial relations and correlation. The results show that there are different characteristics of the annual average temperature and L*, a* and b* in different regions of the study area based on analysis of the general trend and spatial correlation. Besides, annual average precipitation and L*, a* and b* in the study area all presents negative correlation in the general trend. According to the spatial relation analysis, they also have inverse correlation in the southeast and central region of the study area. The color index(L*, a* and b* )are negatively related with annual average precipitation, of which the correlation coefficients are 0.26, 0.35 and 0.29 respectively(P=0.01), but the color index has no significant correlation with annual average temperature, which may relate with the difference of their relationships in different regions. The correlation of modern sediment color index and climate parameters links with some factors including the number of sampling points, distribution density, the span of space, zonal soil and different correlation analysis methods. This study can provide more references for further exploring the relationship between color index of stratum and paleoclimate.

Key words: color index, climate parameters, modern surface sediment, correlation, Xinjiang, Qinghai

CLC Number: 

  • P512.2