数字农科院2.0

Responses of soil functional organic matter fraction stabilities to long-term nitrogen and phosphorus addition in meadow steppe

文献类型： 外文期刊

作者： Wu, Zhendan;Zhang, Yaling;Wu, Renheng;Ye, He;Yang, Dianlin;Hong, Mei

作者机构：

关键词： Long-term nitrogen and phosphorus applications;Soil functional organic matter fractions;Stability;Drivers;Meadow steppe

期刊名称： JOURNAL OF SOILS AND SEDIMENTS

ISSN： 1439-0108

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Purpose Soil organic carbon (SOC) and its functional fractions are central to soil fertility and quality. However, the response of functional fractions to long-term nitrogen (N) and phosphorus (P) applications and their relative importance for C sequestration remain unclear. Materials and methods We designed an experiment on N and P applications in Inner Mongolia 's Stipa baicalensis meadow steppe. The experiment was set up with four treatments: control, N, P, and NP (100 kg N ha(-1) yr(-1) + 100 kg P ha(-1) yr(-1) ) to investigate the response of SOC and its functional fractions to long-term N and P applications. Results and discussion Compared with the control, the SOC content increased by 17.43%, 21.34%, and 41.17% respectively in the N, P, and NP treatments. Under the addition of N and P, fPOM (unprotected), Hdsilt + clay (chemical protection), and NHdsilt + clay (biochemical protection) increased by 153.76% similar to 261.29%, 10.00% similar to 60.65%, and 12.97% similar to 38.39% respectively. These fPOM, Hdsilt + clay, NHdsilt + clay fractions were positively correlated with potential organic C input (aboveground plant C + root C + root secretion C) and SOC. The N treatment primarily regulates the changes in the content of SOC and its functional fractions by increasing aboveground biomass (AGB) and decreasing pH. The P treatment primarily regulates the changes by increasing AGB and available P (AP). The NP treatment primarily regulates the changes by increasing AGB and AP, and decreasing pH. Conclusions Long-term addition of N and P in the meadow steppe leads to preferential stabilization of SOC in the fPOM fraction. Ultimately, this SOC is stably sequestered through the Hdsilt + clay and NHdsilt + clay fractions. This stabilization and transformation process is regulated by vegetation factors and soil factors, with the contribution of vegetation factors outweighing that of soil factors.

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