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| Statistical probability analysis of the physical index of rooted soil in Qiadam basin |
| FU Jiangtao1，YU Dongmei2，LI Xiaokang3，LIU Changyi4，HU Xiasong2，4 |
| (1. School of Civil Engineering and Architecture，Shaanxi University of Technology，Hanzhong，Shaanxi 723000，China；2. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources，Qinghai Institute of Salt Lakes，Chinese Academy of Sciences，Xining，Qinghai 810008，China；3. School of Mathematics and Computer Sciences，Shaanxi University of Technology，Hanzhong，Shaanxi 723000，China；4. Department of Geological Engineering， Qinghai University，Xining，Qinghai 810016，China) |
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Abstract Shear strength indices are key parameters used to assess the anti-scourability of rooted soil. Influenced by factors such as growth period of vegetation，vegetation species type，etc.，values of shear strength indices of rooted soil usually exhibit great variability. To reduce this variability，the shear experiment of rooted soil should be repeated more times to improve the accuracy of shear strength indices and to evaluate the influence factors. However，increasing the number of specimens means extensive damage and disturbance to the ecosystem of grassland，which is frail and vulnerable to be damaged and disturbed. Thus，the priority with reference to specimens is to decrease the number of sampled rooted soil. In this paper，rooted soil of halophytes in salt lake regions of the Daqiadam Lake in Haixi，Qinghai，was selected as the shear test object to obtain the shear strength indices. Oven drying and weighting were used to obtain the moisture content as well as root washing and weighting for the root content，and the root diameter in rooted soil was obtained using a vernier caliper. The correlations between shear strength indices of rooted soil with root content，root diameter and moisture content were analyzed，then，the distribution patterns and the distribution parameters of these physical variables were fitted based on Normal，Gamma，Rayleigh and Weibull distributions，and next Kolmogorov- Smilov test was used to verify these distribution. The results show that，among the five physical indices，the cohesion has a negative correlation with the moisture content while a positive correlation with the root content，and no obvious correlation exists among other physical indices. It is also revealed that the optimal distributions for internal friction angle，the cohesion and the root content，and the root diameter and moisture content are respectively Normal distribution，Weibull distribution and Gamma distribution. This research contributes to further investigate the factors impacting the shear strength of rooted soil and to explore the interaction among the factors，and also has a real meaning in reducing the disturbance and damage to grassland due to the activities of rooted soil sampling.
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2020, Vol. 39 
