Effects of snow cover change on the content of base ions and available silicon and aluminum of black soil in Northeast China
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College of Water Conservancy and Civil Engineering,Northeast Agricultural University

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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    Abstract:

    Northeast China is the largest snow stabilization region in China. The change of snow deposition depth caused by climate warming may affect the frozen state of soil in the northeast black soil region in winter, and further change the physical and chemical environment of soil, so as to change the availability of soil base ions and available silicon and aluminum to crops in the growing season. In order to explore the seasonal variation characteristics of black soil base ions and available silicon and aluminum in northeast farmland under the change of snow depth in winter, the method of artificial snow depth control was adopted. By measuring the environmental factors (temperature and humidity, moisture content, pH value, total organic carbon), base ions, available silicon and active aluminum of the northeast farmland black soil in the snow removal group (SR), snow reduction group (SL), natural snow control group (C) and snow enhancement group (SA), the change process of the content of soil base ions and available silicon aluminum was analyzed. And their responses to soil environmental factors. The results showed that the decrease of snow depth changed the water and heat distribution of the black soil under seasonal snow cover, and the soil temperature of 0-30cm decreased significantly, while the average soil moisture content showed an increasing trend. With the decrease of HCO3- content caused by the decrease of snow cover depth, the average pH values of soil in each group changed by -0.06, -0.04, -0.02 and 0.01, respectively. The decrease of soil alkalescence increased the contents of exchangeable monovalent cations (Na+, K+), while decreased the contents of exchangeable and carbonate bivalent cations (Ca2+ and Mg2+). Carbonate divalent cation and exchange Na+ had positive and negative effects on TOC content, and the average total organic carbon (TOC) content increased by 0.87 g/kg, 1.09 g/kg, 1.32 g/kg and 1.48 g/kg with the decrease of snow cover depth, respectively. The interaction between base ions and soil pH and TOC reduces soil pH and organic matter content under the condition of reduced snow depth, resulting in the decrease of soil adsorption of available silicon, and promotes the conversion of low-active aluminum to high-active aluminum. Finally, the content of available silicon and aluminum humate (Al-HA) in soil is significantly reduced. The contents of exchange aluminum (Ex-Al), monomer hydroxy-Al (Hy-Al) and acid-soluble inorganic aluminum (Col-Al) increased significantly, and the base ions had a potential effect on the available silicon and aluminum indirectly through the interaction with TOC and pH.

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History
  • Received:June 16,2023
  • Revised:July 27,2023
  • Adopted:August 10,2023
  • Online: January 27,2024
  • Published: