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干旱区科学  2015, Vol. 7 Issue (6): 765-777    DOI: 10.1007/s40333-015-0134-9
  学术论文 本期目录 | 过刊浏览 | 高级检索 |
Re-evaluating the vertical mass-flux profiles of aeolian sediment at the southern fringe of the Taklimakan Desert, China
XUE Jie1,2,3,4, LEI Jiaqiang1,2*, LI Shengyu1, GUI Dongwei1,2,3, MAO Donglei1,2,3,4, ZHOU Jie1,2,3,4
1 State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2 Cele National Station of Observation and Research for Desert-Grassland Ecosystem, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Cele 848300, China;
3 Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
4 University of Chinese Academy of Sciences, Beijing 100049, China
Re-evaluating the vertical mass-flux profiles of aeolian sediment at the southern fringe of the Taklimakan Desert, China
XUE Jie1,2,3,4, LEI Jiaqiang1,2*, LI Shengyu1, GUI Dongwei1,2,3, MAO Donglei1,2,3,4, ZHOU Jie1,2,3,4
1 State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2 Cele National Station of Observation and Research for Desert-Grassland Ecosystem, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Cele 848300, China;
3 Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
4 University of Chinese Academy of Sciences, Beijing 100049, China
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摘要 Reliable estimation of the mass-flux profiles of aeolian sediment is essential for predicting sediment transport rates accurately and designing measures to cope with wind-erosion. Vertical mass-flux profiles from seventeen wind-erosion events were re-evaluated using five typical models based on observed data obtained from a smooth bare field at the southern fringe of the Taklimakan Desert, China. The results showed that the expo-nential-function model and the logarithmic-function model exhibited the poorest fit between observed and predicted mass-flux profiles. The power-function model and the modified power-function model improved the fit to field data to an equivalent extent, while the five-parameter combined-function model with a scale constant (σ) of 0.00001 m (different from the σ value proposed by Fryear, which represented the height above which 50% of the total mass flux occurred) was verified as the best for describing the vertical aeolian sediment mass-flux profiles using goodness of fit (R2) and the Akaike Information Criterion (AIC) values to evaluate model performance. According to relationships among model parameters, the modified power model played a prominent explanatory role in describing the vertical profiles of the observed data, whereas the exponential model played a coordinating role. In addition, it was found that the vertical profiles could not be extrapolated using the five selected models or easily estimated using an efficient model without field observations by a near-surface sampler at 0 to 0.05 m.
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关键词:   desert plant  stable isotope  water source  water-use efficiency    
Abstract: Reliable estimation of the mass-flux profiles of aeolian sediment is essential for predicting sediment transport rates accurately and designing measures to cope with wind-erosion. Vertical mass-flux profiles from seventeen wind-erosion events were re-evaluated using five typical models based on observed data obtained from a smooth bare field at the southern fringe of the Taklimakan Desert, China. The results showed that the expo-nential-function model and the logarithmic-function model exhibited the poorest fit between observed and predicted mass-flux profiles. The power-function model and the modified power-function model improved the fit to field data to an equivalent extent, while the five-parameter combined-function model with a scale constant (σ) of 0.00001 m (different from the σ value proposed by Fryear, which represented the height above which 50% of the total mass flux occurred) was verified as the best for describing the vertical aeolian sediment mass-flux profiles using goodness of fit (R2) and the Akaike Information Criterion (AIC) values to evaluate model performance. According to relationships among model parameters, the modified power model played a prominent explanatory role in describing the vertical profiles of the observed data, whereas the exponential model played a coordinating role. In addition, it was found that the vertical profiles could not be extrapolated using the five selected models or easily estimated using an efficient model without field observations by a near-surface sampler at 0 to 0.05 m.
Key words:   desert plant    stable isotope    water source    water-use efficiency
收稿日期:  2014-12-27      修回日期:  2015-03-09           出版日期:  2015-12-10      发布日期:  2015-07-01      期的出版日期:  2015-12-10
基金资助: 

The Special Scientific Research Fund of Meteorological Public Welfare Profession of China (GYHY201106025) and the Na-tional Natural Science Foundation of China (41471031)

通讯作者:  LEI Jiaqiang    E-mail:  desert@ms.xjb.ac.cn
引用本文:    
XUE Jie, LEI Jiaqiang, LI Shengyu, GUI Dongwei, MAO Donglei, ZHOU Jie. Re-evaluating the vertical mass-flux profiles of aeolian sediment at the southern fringe of the Taklimakan Desert, China[J]. 干旱区科学, 2015, 7(6): 765-777.
XUE Jie, LEI Jiaqiang, LI Shengyu, GUI Dongwei, MAO Donglei, ZHOU Jie. Re-evaluating the vertical mass-flux profiles of aeolian sediment at the southern fringe of the Taklimakan Desert, China. Journal of Arid Land, 2015, 7(6): 765-777.
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http://jal.xjegi.com/CN/10.1007/s40333-015-0134-9  或          http://jal.xjegi.com/CN/Y2015/V7/I6/765
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