3.Urumqi Municipal Bureau of;Natural Resources,Urumqi,Xinjiang 830000,China
4.Key Laboratory of Oasis Ecology and Desert;Environment,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi,Xinjiang 830011,China
Objective The non-stationary dynamic characteristics of surface soil moisture under microtopographic conditions were systematically analyzed in order to provide important scientific support for optimizing water management strategies and constructing self-sustaining ecosystems in ecological restoration of arid regions. Methods Based on continuous monitoring data and the Pettitt test, abrupt change points of soil moisture during the frozen soil thawing period were quantitatively identified and stages were divided. The regulatory mechanisms of microtopography on soil moisture dynamics at different depths were revealed, and a snow-topography-moisture-soil response chain was constructed. The ARIMA (1, 1, 1) model was applied to predict soil moisture trends. Results ①During the early thawing period, shallow soil moisture (10 cm and 20 cm) in the restored area increased significantly, with maximum values of 0.312 m³/m³ and 0.199 m³/m³, and average increases of 22.1% and 19.4%, respectively. In the control area, the maximum values were 0.231 m³/m³ and 0.186 m³/m³, with average increases of only 14.6% and 12.5%. Moisture recharge in soil layers at 30 cm and below was relatively weak, with no significant difference between the restored and control areas. ②During the mid-thawing period, soil moisture at 10 cm and 20 cm in the restored area gradually decreased but remained higher than that in the control area. Moisture at 30 cm and 40 cm in the restored area increased slowly, with maximum values of 0.155 m³/m³ and 0.139 m³/m³, respectively, while in the control area, the values were 0.127 m³/m³ and 0.129 m³/m³. ③During the late thawing period, soil moisture stabilized, while groundwater moisture decreased. Shallow soil moisture in the restored area showed relatively large fluctuations, enabling ephemeral plants to rapidly complete their life cycle by utilizing moisture pulses. The ARIMA (1, 1, 1) model performed well in predicting soil moisture at depths of 10 cm and 20 cm, with Nash-Sutcliffe efficiency coefficients of 0.85 and 0.82, respectively, indicating high predictive accuracy. Conclusion Microtopography restoration significantly enhances shallow soil moisture during the seasonal frozen soil thawing period, improving water availability for the early spring germination of ephemeral plants. Level trenches, as a near-natural restoration measure, demonstrate good ecological regulation potential and promotion value.
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