Pedosphere 34(5): 853--864, 2024
ISSN 1002-0160/CN 32-1315/P
©2024 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Positive effect of carbohydrate-metabolizing bacteria determines increasing soil organic carbon during long-term fertilization and straw returning in the black soil region of China |
Yingxin LI1,2,3, Yu SUN1, Eiko E. KURAMAE3,4, Shaoqing ZHANG1,2, Enze WANG1,2, Zongmu YAO1,2, Fahad NASIR1, Lei TIAN1, Qiang GAO5, Chunjie TIAN1 |
1 State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102 (China);
2 University of Chinese Academy of Sciences, Beijing 100049 (China);
3 Department of Microbial Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen 6708 PB (The Netherlands);
4 Ecology and Biodiversity Group, Department of Biology, Institute of Environmental Biology, Utrecht University, Padualaan 8, Utrecht 3584 CH (The Netherlands);
5 Jilin Agricultural University, Key Lab Soil Resource Sustainable Utilization for Jilin Province Commodity Grain Bases, Changchun 130118 (China) |
| ABSTRACT |
| In the context of global efforts to reduce carbon (C) emissions, several studies have examined the effects of agricultural practices such as straw returning and fertilization on C sequestration by microorganisms. However, our understanding of the specific microbial groups and their roles in long-term C increase remains limited. In this study, a 36-year (1984-2020) farmland experiment was conducted to investigate the impact of bacterial C metabolism on the augmentation of organic C in a Typic Hapludoll (Mollisol) in the black soil region of Jilin Province, Northeast China. Our results demonstrated a noteworthy increase in the diversity of microorganisms in the farmland as a result of long-term straw returning and application of mixed chemical fertilizers. However, by examining the functions of microorganisms involved in C metabolism, it was observed that the effects of fertilization on C metabolism were relatively consistent. This consistency was attributed to a deterministic competitive exclusion process, which minimized the differences between treatment groups. On the other hand, the influence of straw addition on C metabolism appeared to follow a more random pattern. These changes in microbial activity were closely linked to the downregulation of core metabolic pathways related to C metabolism. Notably, long-term fertilization had a negative impact on soil organic C levels, while long-term straw returning plus fertilization resulted in a positive increase in soil organic C. These findings have important implications for enhancing soil organic C and grain yield in the regions with typical black soil. |
| Key Words: community assembly,metabolic pathway,microbial activity,Mollisol,soil organic C,straw addition |
| Citation: Li Y X, Sun Y, Kuramae E E, Zhang S Q, Wang E Z, Yao Z M, Nasir F, Tian L, Gao Q, Tian C J. 2024. Positive effect of carbohydrate-metabolizing bacteria determines increasing soil organic carbon during long-term fertilization and straw returning in the black soil region of China. Pedosphere. 34(5): 853-864. |
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