Evidence for involvement of keystone fungal taxa in organic phosphorus mineralization in subtropical soil and the impact of labile carbon. (September 2020)

• Record Type: Journal Article
• Authors: Chen, Yan; Sun, Ruibo; Sun, Tingting; Chen, Pin; Yu, Zhiying; Ding, Linyun; Jiang, Yuji; Wang, Xiaoyue; Dai, Chuanchao; Sun, Bo
• Is Part Of: Soil biology and biochemistry. Volume 148(2020)
• Publication Date: 2020-09
• Subjects: Organic phosphorus mineralization -- Phosphorus availability -- Fungal-mediated mineralization -- Labile carbon -- Species interactions; Soil biochemistry -- Periodicals; Soil biology -- Periodicals; Sols -- Biochimie -- Périodiques; Sols -- Biologie -- Périodiques; Sols -- Microbiologie -- Périodiques; Bodembiologie; Biochemie; 631.46
• DOI: 10.1016/j.soilbio.2020.107900
• Languages: English
• ISSNs: 0038-0717

Abstract

Abstract: Soil organic carbon (SOC) derived from manure increase phosphorus (P) availability by increasing the proportion of organic P (Po) in total P. However, what role SOC plays in the process of converting Po to available P (AP) and who modulates Po mineralization are still poorly understood. In this study, we collected three soil samples under long-term filed treatment with different organic (no carbon, straw, and manure) inputs. By comparing bacterial and fungal lecithin-enrichment liquid cultures, we observed that the lecithin-enriched fungal community showed higher capability for Po mineralization. Using high-throughput sequencing of the field and lecithin-enriched microbial communities, we identified Po-mineralizing taxa in the soil. Co-occurrence network analysis revealed that the keystone fungal taxa Geastrum sp. and Chaetomium sp. in the fungal network negatively associated with Po-mineralizing fungal taxa, whereas keystone bacterial taxon was not directly related to Po-mineralizing bacteria. We found labile C limits the growth of keystone fungal taxa and that the addition of lactose enhanced Po mineralization by increasing the abundance of Po-mineralizing fungal taxa. Our results emphasize the importance of soil fungi for Po mineralization in acidic soil from a community perspective and provide evidence that easily degradable C drives Po mineralization and influences P availability through limitation of keystone fungal taxa. Our study gives insight into the biological mechanisms underlying specific organic carbon-induced interactions between fungal taxa and provides crucial information for the facilitation of P cycling. Highlights: Fungi acted as a key driving organic P (Po) mineralization in acidic soil. Labile carbon promoted Po mineralization. The keystone fugal taxa negatively regulate the growth of Po-mineralizing taxa. Labile carbon activated fungal Po mineralization by limiting the growth of keystone fungal taxa.