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<p>Soil water and heat are the key variables affecting the functions of ecosystems, and play decisive roles in the ecological effects of vegetation construction. Understanding how vegetation affects local soil water and heat dynamics in drylands is important. Therefore, a three‒year experiment in the <i>Mu Us</i> Sandy Land in Northwest China was conducted, and typical shrub‒<i>Salix</i> in study region was chosed as the research object, with bare sandy land used as the control. Through in situ monitoring, the dynamic characteristics of soil water and soil heat under the influence of water consumption by <i>Salix</i> were analyzed. The results revealed that soil water migration was driven mainly by the matrix potential and gravity potential in the non-freeze‒thaw stage. In the freeze‒thaw stage, the soil water migration mainly affected by the influence of the temperature gradient. The depth of the frozen front is related to the water table depth. The shallower the water table depth is, the deeper the frozen front of the soil is, reaching 80&#xa0;cm, and when the water table depth is deep, the frozen front depth is not greater than 60&#xa0;cm. <i>Salix</i> could also reduce the depth of the frozen front. Vegetation has a cooling effect at high temperature and an insulating effect at low temperature above 50&#xa0;cm soil depth. Simultaneously, there is a power law correlation between soil water and soil temperature at different depths during the freeze‒thaw process. The variation characteristics of soil water and temperature and the internal interaction mechanism in <i>Salix</i> land with different water table depths in different rainfall years were revealed. These findings provide a reference for developing sustainable vegetation restoration strategies for water resources.</p>

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Effects of vegetation on soil water and heat transport in the Mu Us Sandy Land

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Zhenguo Xing,
  • Jie Fang,
  • Lu Bai,
  • Xuejia Li,
  • Xiaoqing Liu,
  • Gang Liu,
  • Ming Zhao

摘要

Soil water and heat are the key variables affecting the functions of ecosystems, and play decisive roles in the ecological effects of vegetation construction. Understanding how vegetation affects local soil water and heat dynamics in drylands is important. Therefore, a three‒year experiment in the Mu Us Sandy Land in Northwest China was conducted, and typical shrub‒Salix in study region was chosed as the research object, with bare sandy land used as the control. Through in situ monitoring, the dynamic characteristics of soil water and soil heat under the influence of water consumption by Salix were analyzed. The results revealed that soil water migration was driven mainly by the matrix potential and gravity potential in the non-freeze‒thaw stage. In the freeze‒thaw stage, the soil water migration mainly affected by the influence of the temperature gradient. The depth of the frozen front is related to the water table depth. The shallower the water table depth is, the deeper the frozen front of the soil is, reaching 80 cm, and when the water table depth is deep, the frozen front depth is not greater than 60 cm. Salix could also reduce the depth of the frozen front. Vegetation has a cooling effect at high temperature and an insulating effect at low temperature above 50 cm soil depth. Simultaneously, there is a power law correlation between soil water and soil temperature at different depths during the freeze‒thaw process. The variation characteristics of soil water and temperature and the internal interaction mechanism in Salix land with different water table depths in different rainfall years were revealed. These findings provide a reference for developing sustainable vegetation restoration strategies for water resources.