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LU Wende, LI Guang, LIU Shuainan, et al. Effects of high nitrogen and biochar additions on soil nitrogen fractions in abandoned grasslands on the Loess Plateau[J]. Journal of Soil and Water Conservation, 2025, 39(4):39-47.DOI: 10.13870/j.cnki.stbcxb.2025.04.002. CSTR: 32310.14.stbcxb.2025.04.002.