Insight into the fraction variations of selenium and their effects on humification during composting

Zhaoyu Wang; Mengxiang Zhao; Jianwen Xie; Zhen Wang; To-Hung Tsui; Xiuna Ren; Zengqiang Zhang; Quan Wang

doi:10.1016/j.biortech.2022.128050

Insight into the fraction variations of selenium and their effects on humification during composting

Bioresour Technol. 2022 Nov:364:128050. doi: 10.1016/j.biortech.2022.128050. Epub 2022 Sep 30.

Authors

Zhaoyu Wang¹, Mengxiang Zhao¹, Jianwen Xie¹, Zhen Wang², To-Hung Tsui³, Xiuna Ren¹, Zengqiang Zhang¹, Quan Wang⁴

Affiliations

¹ College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China.
² College of Ecology and Environment, Ningxia University, Yinchuan, Ningxia 750021, China.
³ NUS Environment Research Institute, National University of Singapore, 5A Engineering Drive 1, Singapore 117411, Singapore.
⁴ College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China; Breeding Base for State Key Lab of Land Degradation and Ecological Restoration in Northwestern China / Key Lab of Restoration and Reconstruction of Degraded Ecosystems in Northwestern China of Ministry of Education, China. Electronic address: quanwang_1990@163.com.

PMID: 36184014
DOI: 10.1016/j.biortech.2022.128050

Abstract

This study investigated the variation of selenium fractions and their effects on humification during composting. Selenite and selenate were added to a mixture of goat manure and wheat straw for composting. The results demonstrated that the bioavailable Se in the selenite added treatment (9.3-13.8%) was lower than in the selenate added treatment (18.1-47.3%). Meanwhile, the HA/FA of selenite and selenate added treatments were higher than in control, indicating that the selenium addition (especially selenite) promoted the humification of composting. Importantly, selenite enriched the abundance of Tepidimicrobium and Virgibacillus which were responsible to improve humification performance. Selenate increased the abundance of Thermobifida and Cellvibrio which facilitated the composting humification. The genes encoding CAZymes involved in the degradation of organic materials were also analyzed, and selenium could contribute to the synthesis of humus. KEGG pathway analysis revealed that the selenite addition promoted amino acids and carbohydrate metabolism compared to the control.

Keywords: CAZymes genes; Composting; Humification; Selenium; Selenium fractions.