典型草原禁牧条件下土壤水分对降雨模式的响应

Abstract

Abstract: The meteorological, vegetation and soil factors as well as the soil moisture content in depths of 5-, 10-, 15- and 30-cm layers were monitored and analyzed. The purposes were to analyze and reveal the change of rainfall patterns and soil moisture content under grazing prohibition in the Xilin Gol typical steppe in Inner Mongolia. The results showed that the vertical heterogeneity of soil moisture content was increased after implementing the grazing prohibition for 3 years, the difference of soil moisture content in each soil layer was significant during rainfall process in the grazing prohibition sites, while the situation was opposite in the grazing areas. The lag time of soil moisture response to rainfall increased with the increase of soil depth. Compared with the grazing prohibition sites, the water holding capacity of shallow soil (5 cm and 10 cm in depth) in the grazing areas was weaker, and the infiltration time was shorter. There was no obvious replenishment effect of rainfall on soil moisture when the rainfall was less than 5 mm in both the grazing areas and grazing prohibition sites, and it was the most advantageous for the rainwater infiltration when rained continuously and uniformly and the rainfall intensity did not exceed 5 mm·h^-1. Rainwater could infiltrate into 15- and 30-cm soil layers when rainfall was 7.9 mm and more than 25 mm respectively in the grazing areas, but it could infiltrate into 30-cm soil layer when rainfall was more than 5 mm in the grazing prohibition sites. Rainwater could infiltrate into topsoil (5 cm) only when the intensity of an independent rainfall was 5-6 mm·h^-1, and it could infiltrate rapidly into 30-cm soil layer or deeper through the macropores when the rainfall intensity was higher than 15 mm·h^-1in the grazing prohibition sites. In the grazing areas, rainwater could infiltrate rapidly into topsoil (0-5 cm) but slowly into deep soil to form surface runoff and even flood disasters. The study results could be referred in researching the grassland ecohydrological process and formulating a rational grazing policy.

Key words: Xilin Gol Steppe')">

Xilin Gol Steppe, rainfall pattern, soil moisture content, rainwater infiltration, Inner Mongolia

XU Ran, ZHANG Sheng-wei, ZHU Zhong-yuan, ZHANG Peng, GAO Lu. Response of Soil Moisture Content to Rainfall Patterns in Typical Steppe under Grazing Prohibition[J].Arid Zone Research, 2019, 36(6): 1359-1367.

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Response of Soil Moisture Content to Rainfall Patterns in Typical Steppe under Grazing Prohibition

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