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. 2024 Oct 18;15:1400261. doi: 10.3389/fpls.2024.1400261

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Copyright © 2024 Wang, Tian, Li, Wang, Mei, Li, Wang, Yang, Zhang, Tao, Zhu and Xiong

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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RDA biplot based on biomass and C and N concentrations of alfalfa plant variables in all treatments under different size aggregates C (A) and N (B) stocks. CK, abandoned farmland. 5-Y, 8-Y, 10-Y, 15-Y, and 20-Y represent planting variations for 5, 8, 10, 15, and 20 years, respectively, AB, aboveground biomass; UB, underground biomass; C-A, carbon concentration of alfalfa aboveground plant; C-U, carbon concentration of alfalfa underground plant; N-A, nitrogen concentration of alfalfa aboveground plant; N-U, carbon concentration of alfalfa underground plant; C/N-A, carbon-nitrogen ratio of alfalfa aboveground plant; C/N-U, carbon-nitrogen ratio of alfalfa underground plant; SBD, soil bulk density; SWS, soil water storage.