Long‐term successive biochar application increases plant lignin and microbial necromass accumulation but decreases their contributions to soil organic carbon in rice–wheat cropping system

• DOI: 10.1111/gcbb.13137
• Publication Date: 2024-04-29T08:55:19Z
• Authors: Zhaoming Chen; Lili He; Jinchuan Ma; Junwei Ma; Jing Ye; Qiaogang Yu; Ping Zou; Wanchun Sun; Hui Lin; Feng Wang; Xu Zhao; Qiang Wang
• Keywords: Soil carbon; Carbon fibers

Abstract Biochar application is widely recognized as an effective approach for increasing soil organic carbon (SOC) and mitigating climate change in agroecosystems. However, the effects of biochar on net accumulations relative contributions different SOC sources remain unclear. Here, we explored plant‐derived (PDC) microbial necromass C (MNC) a 10‐year experimental rice–wheat rotation field receiving four intensities (0, 2.25, 11.5, 22.5 t ha −1 each crop season), using phospholipid fatty acids (PLFAs), lignin phenols amino sugars biomarkers biomass, PDC MNC, respectively. Our results showed that increased content stock by 32.6%–203% 26.4%–145%, Higher (11.5 ) pH, total nitrogen (TN), phosphorus (TP), SOC/TN, root biomass. In addition, higher enhanced bacterial, fungal, Plant MNC contents significantly increased, whereas their to decreased with increase rates due disproportionate SOC. Fungal had greater contribution than bacterial necromass. The fungal/bacterial from 2.56 2.26 rates, because abundances bacteria fungi indicated PLFAs under rates. Random forest analyses revealed TP, SOC/TN were main factors controlling plant accumulation. Structural equation modeling stimulating accumulation was primarily biomass phenols. Overall, our findings suggest increases two but decreases paddy soils.