Response of soil carbon and nitrogen fractions in marshy meadow soils of Gahai wetland area to warming and nitrogen application
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College of forestry, Gansu Agriculture University

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    Abstract:

    To examine the attributes of soil carbon and nitrogen fractions in alpine wetland soils under the influence of climate warming and nitrogen deposition, a study was conducted. Four treatments were established, namely control (CK), warming (W), nitrogen application (N), and warming nitrogen (WN). These treatments were designed to simulate potential future scenarios of climate warming and nitrogen deposition in a swamp meadow located in the Gahai Wetland Area. The soil carbon and nitrogen levels were quantified a year and a half following the completion of the experiment.. The results showed that: 1) The utilization of the open top box warming device resulted in a notable elevation of the mean temperature within the 0-15 cm soil layer by 0.53°C. Additionally, this intervention led to a significant decrease in the water content (SMC) and pH levels, as well as the concentrations of soil total nitrogen (TN), microbial nitrogen (MBN), ammonium nitrogen (NH4+-N), organic carbon (SOC), and soluble organic carbon (DOC) within the 0-10 cm soil layer. Conversely, there was an observed increase in the concentration of nitrate nitrogen (NO3--N)..2) Nitrogen application considerably lowered the contents of NH4+-N and SOC in all soil layers, as well as the contents of microbial biomass carbon (MBC) and DOC in soil layers 10-20 cm deep, but increased the contents of TN, MBN, and NO3--N. 3) The application of nitrogen through warming conditions resulted in a large rise in SMC, TN, NO3--N, and MBC content. Conversely, it led to a significant reduction in MBN, NH4+-N, and DOC.. 4) Correlation analysis showed that there was a positive correlation between soil moisture and all physicochemical factors, and soil carbon and nitrogen components were positively correlated.. The results indicated that the simulated warming application of nitrogen alleviated the temperature and nitrogen limitation of plant growth in the Gahai wetland, promoted the accumulation of TN, and had a greater impact on the soil microbiota carbon and nitrogen fractions, which led to the conversion of soil microbial carbon and nitrogen activities and distribution characteristics.

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History
  • Received:August 29,2023
  • Revised:October 12,2023
  • Adopted:October 16,2023
  • Online: January 27,2024
  • Published: