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Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (4): 190-198.DOI: 10.7522/j.issn.1000-694X.2022.00007

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Water use characteristics of typical plant Artemisia halodendron in Horqin Sandy Land

Chao He1(), Tingxi Liu1,2(), Limin Duan1,2, Guanli Wang1,2, Lina Hao1,2   

  1. 1.Water Conservancy and Civil Engineering College /, Inner Mongolia Agricultural University,Hohhot 010018,China
    2.Inner Mongolia Key Laboratory of Protection and Utilization of Water Resources, Inner Mongolia Agricultural University,Hohhot 010018,China
  • Received:2021-11-04 Revised:2022-01-19 Online:2022-07-20 Published:2022-08-29
  • Contact: Tingxi Liu

Abstract:

In-depth analysis of the water use characteristics of sand-fixing vegetation on sandy land can provide references for ecological restoration of sandy land vegetation and regional desertification prevention and control. This study uses hydrogen and oxygen isotope technology to determine the δD values of plant water in the typical sand-fixing vegetation of Artemisia halodendron and the precipitation, soil water, and groundwater in Horqin Sandy Land during the vegetation growth season in 2020. The multi-source linear mixed model is used to quantitatively segment the water use sources of A. halodendron. The results show that: (1) The slope of the atmospheric precipitation equation in the study area is smaller than the national atmospheric precipitation equation line, indicating that the atmospheric precipitation in this area has strong evaporation and the equation intercept is large, indicating that the water vapor recirculation in the study area is strong. The slope and intercept of the soil water isotope equation line are smaller than the atmospheric precipitation equation line in the study area, indicating that soil water is significantly affected by secondary evaporation. (2) Changes in rainfall and plant growth periods have a clear correlation with soil water content. Affected by rainfall, shallow soil water content has the largest fluctuation range from 0 to 40 cm, and soil water content tends to stabilize with the increase of soil depth. (3) In the rainy season, A. halodendron mainly uses soil water at depths of 0-40 cm and 120-160 cm, with utilization rates of 30.1% and 25.2%, respectively, and uses less soil water in other parts; in dry seasons, 0-80 cm is mainly used the utilization rate of soil water with depth of 160-200 cm is 30.7% and 21.1% respectively, which is significantly higher than other soil water.

Key words: Artemisia halodendron, hydrogen and oxygen stable isotopes, multi-source linear mixed model, water source, Horqin Sandy Land

CLC Number: