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WU Chunyu, YANG Yali, XIE Hongtu, et al. Influence of different cover crops on soil enzyme activities and their regulatory mechanisms in black soil region of northeast China[J].Journal of Soil and Water Conservation,2026,40(2):131-139.:131-139. DOI: 10.13870/j.cnki.stbcxb.2026.02.041. CSTR: 32310.14.stbcxb.2026.02.041.