Sugarcane/soybean intercropping with reduced nitrogen addition enhances residue-derived labile soil organic carbon and microbial network complexity in the soil during straw decomposition

• DOI: 10.1016/j.jia.2024.02.020
• Publication Date: 2024-02-29T06:48:21Z
• Authors: Tantan Zhang; Yali Liu; Shiqiang Ge; Peng Peng; Hu Tang; Jianwu Wang
• Keywords: Intercropping; Soil carbon; Residue (chemistry); Carbon fibers; Crop Residue

Sugarcane/soybean intercropping with reduced nitrogen addition is an important sustainable agricultural pattern that can alter soil ecological functions, thereby affecting straw decomposition in the soil. However, mechanisms underlying changes organic carbon (SOC) composition and microbial communities during under long-term remain unclear. In this study, we conducted in-situ microplot incubation experiment 13C-labeled soybean residue a two-factor (cropping pattern: sugarcane monoculture (MS) sugarcane/soybean (SB); levels: (N1) conventional (N2)) experimental field plot. The results showed SBN1 treatment significantly increased residual particulate (POC) biomass (MBC) contents decomposition, was mainly conserved as POC. Straw changed structure diversity of community, but gradually recovered time. During relative abundances Firmicutes Ascomycota. addition, network complexity it pattern. Nevertheless, remained higher than MSN1 treatment. general, abundance microorganisms associated matter were driven by labile SOC fractions. These findings suggest more be sequestered to maintain contribute development agriculture.