Response Relationship between the Seasonal Freezing-Thawing Process of Soil and Spatial Factor Changes in the Dayekou Basin of the Qilian Mountains
- 1 School of Urban and Environmental Science, Huaiyin Normal University, Huaian, China
- 2 Administration of Qilian Mountain National Nature Conservation in Gansu, Zhangye, China
Abstract
Objective: In this study, the influence and response relationship between the seasonal freezing-thawing process of soil and the spatial factor changes in the management and utilization of water resource processes were explored. Methods: The monitoring equipment in this study was arranged at different altitudes, gradients, and slope directions, such as the typical forest sample area in the Dayekou Basin of the Qilian Mountains. The spatial variation characteristics of the seasonal freezing-thawing process of the soil were analyzed, and a regression model was established. Results: 1) The results of this study determined that the rate of the soil’s freezing increased with the altitude in a trend of volatility. However, the rate of the thawing of the frozen soil was found to have an opposite trend. The variation degree of the freezing-thawing process increased with the altitude in a trend of volatility. The end time of the approximate soil freezing with altitude increased in a volatility trend ahead of schedule. However, the opposite was observed in the thawing rate of the frozen soil; 2) The rate of the soil’s freezing under the mosses of the spruce forest at an altitude of 3028 m was found to be the lowest. However, in the sub-alpine scrub forest at an altitude of 3300 m, a maximum in the spatial ordering was observed, with an average of 1.9 cm·d <sup>-1</sup> . The thawing rate of the frozen soil in scrub-spruce forest at an altitude of 3300 m was found to be minimal. However, in the sunny slope grassland at an altitude of 2946 m, a maximum in the spatial ordering was observed, with an average of 1.5 cm·d<sup>-1</sup> . In the spatial ordering of the variation degree of the process of freezing-thawing with an average of 1.2, the scrub-grassland at an altitude of 2518 m was found to be the lowest, and the scrub-spruce forest at an altitude of 3195 m was also low; 3) The soil freezing began on approximately October 20 th , and the rate of soil freezing gradually became reduced. The arrival time of the frozen soil of up to 150 cm in depth in sub-alpine scrub forest was first observed at an altitude of 3028 m. However, the scrub-spruce forest at an altitude of 3100 m did not become frozen until approximately January 12 th on average. Then, the thawing rate of the frozen soil increased gradually. The end time of the thawing was earliest observed in the sunny slope grassland at an altitude of 2946 m. However, the scrub-spruce forest at an altitude of 3100 m was found to be the last to thaw, and averaged approximately July 27 th . The average durations of the freezing and thawing of the soil were 77 and 121 days, respectively, and the average duration of the entire process of freezing-thawing was 199 days; 4) This study’s established regression models of the duration time of frozen soil’s thaw, and the rate of frozen soil’s thaw, all passed the R test of goodness of fit, F test of variance, and t test. Conclusions: The characteristics of the seasonal freezing-thawing process of the soil with the spatial changes were seasonal. However, the characteristics under the different spatial factor influences were not the same.
- Niu, Y., Liu, X.D., Jing, W.M., et al. (2014) Characteristics of Temperature, Soil Freezing and Thawing, and River Flow in the Pailugou Watershed of the Qilian Mountains. Scientia Silvae Sinicae, 50, 27-31.
- Zhang, W., Wang, G.X., Zhou, J., et al. (2012) The Soil Hydrothermal Process Simulation Based on a Coup Model in the Permafrost Regions of the Qinghai-Tibet Plateau. The Journal of Glaciology and Geocryology, 34, 1099-1109.
- Wang, C.H., Jin, S.L. and Shi, H.X. (2014) Area Changes of the Frozen Ground in China in the Next 50 Years. Journal of Glaciology and Geocryology, 36, 1692-1696.
- Li, X. and Cheng, G.D. (1999) A Gis-Aided Response Model of the High-Altitude Permafrost to Global Changes. Science in China Series D: Earth Sciences, 42, 72-79. https://doi.org/10.1007/BF02878500
- Nan, Z.T., Li, S.X. and Cheng, G.D. (2005) Prediction of the Permafrost Distribution on the Qinghai-Tibet Plateau in the Next 50 and 100 Years. Science in China Series D: Earth Sciences, 48, 794-804.
- Nelson, F.E., Anisimov, O.A. and Shilomanov, N.I. (2002) The Climate Changes and Hazard Zonation in the Circum-Arctic Permafrost Regions. Nature Hazard, 26, 203-225. https://doi.org/10.1023/A:1015612918401
- Wang, Z.L., Fu, Q., Jiang, Q.X., et al. (2010) Spatial Variability of the Soil Moisture Profile in the Seasonal Frozen Soil Regions in Different Stages. Scientia Geographica Sinica, 30, 772-776.
- Wang, S.J. and Chen, J.B. (2008) Nonlinear Analysis for the Dimensional Effects of the Temperature Field of the Highway Embankments in Permafrost Regions on the Qinghai-Tibet Plateau. Chinese Journal of Geotechnical, 30, 1544-1549.
- Wang, Q.F., Zhang, T.J., Wu, J.C., et al. (2013) Investigation on Permafrost Distribution over the Upper Reaches of the Heihe River in the Qilian Mountains. The Journal of Glaciology and Geocryology, 35, 19-29.
- Peng, X.Q., Zhang, T.J., Pan, X.D., et al. (2013) Spatial and Temporal Variations of Seasonally Frozen Ground over the Heihe River Basin of Qilian Mountain in Western China. Advance in Earth Sciences, 28, 497-508.
- Zhang, W.J., Cheng, W.M., Li, B.L., et al. (2014) Simulation of the Permafrost Distribution on Qilian Mountains over Past 40 Years under the Influence of Climate Change. Geographical Research, 33, 1275-1284.
- Wang, J.Y., Kang, E.S. and Jin, B.W. (2001) Hydrological function of frozen soil in forest area in the upper reaches of the Heihe River. The Journal of North West Forestry University, 16, 30-34.