Affiliation:
1. Jiangsu Key Laboratory of Anaerobic Biotechnology School of Environment & Ecology Jiangnan University Wuxi 214122 China
2. College of Life Sciences Anhui Agricultural University Hefei 230036 China
3. China Civil Engineering Society Water Industry Association Beijing 100082 China
4. Heilongjiang Academy of Black Soil Conservation and Utilization Harbin 150086 China
Abstract
AbstractLow‐carbon alkaline thermal hydrolysis of sewage sludge for the production of high‐quality plant‐growth‐promoting nutrients and biostimulants is a growing concern for sludge resource utilization in agriculture. Thus, this study aims to investigate functional characteristics and soil biochemical effects of sewage sludge‐derived nutrients and biostimulants (SS‐NB). The content of heavy metals in SS‐NB decreased by 47.39–100%, and an increase in soil protease, invertase, and soil nutrient utilization rates are observed in SS‐NB groups. SS‐NB substituted for chemical fertilizer increased the diversity and evenness of microbial community and reduced the abundance of the soil‐borne bacterial genus Arthrobacter. The dominant community of SS‐NB100 group is mainly enriched in Microvirga, Ensifer, Novosphingobium, Bosea and Ellin6055, which are principally beneficial symbiotic bacteria of plants and participated in C and N cycles. Moreover, SS‐NB reduced the accumulation of Ktedonobacteria and Nitrosospira, which are involved in the production of CO2 and N2O, and also enhanced the coordination of soil microorganisms with enzyme activities and nutrient utilization rate. In conclusion, the results suggest that SS‐NB exerts a positive effect on reducing greenhouse gas emissions and preventing soil‐borne diseases, and can further enhance collaboration with soil enzyme activity and soil nutrient utilization by stimulating soil microorganisms.
Funder
National Key Research and Development Program of China
Subject
General Physics and Astronomy,General Engineering,Biochemistry, Genetics and Molecular Biology (miscellaneous),General Materials Science,General Chemical Engineering,Medicine (miscellaneous)