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Yan Z, Jia R, Zhou J, Zamanian K, Yang Y, Mganga KZ, Zeng Z, Zang H. Soybean inclusion reduces soil organic matter mineralization despite increasing its temperature sensitivity. Sci Total Environ 2024; 922:171334. [PMID: 38423335 DOI: 10.1016/j.scitotenv.2024.171334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 02/25/2024] [Accepted: 02/26/2024] [Indexed: 03/02/2024]
Abstract
Legume-based cropping increased the diversity of residues and rhizodeposition input into the soil, thus affecting soil organic matter (SOM) stabilization. Despite this, a comprehensive understanding of the mechanisms governing SOM mineralization and its temperature sensitivity across bulk soil and aggregate scales concerning legume inclusion remains incomplete. Here, a 6-year field experiment was conducted to investigate the effects of three cropping systems (i.e., winter wheat/summer maize, winter wheat/summer maize-soybean, and nature fallow) on SOM mineralization, its temperature sensitivity, and the main drivers in both topsoil (0-20 cm) and subsoil (20-40 cm). Soybean inclusion decreased the SOM mineralization by 17%-24%, while concurrently increasing the majority of soil biochemical properties, such as carbon (C) acquisition enzyme activities (5%-22%) and microbial biomass C (5%-9%), within the topsoil regardless of temperature. This is attributed to the increased substrate availability (e.g., dissolved organic C) facilitating microbial utilization, thus devoting less energy to mining nutrients under diversified cropping. In addition, SOM mineralization was lower within macroaggregates (∼12%), largely driven by substrate availability irrespective of aggregate sizes. In contrast, diversified cropping amplified the Q10 of SOM mineralization in mesoaggregates (+6%) and microaggregates (+5%) rather than in macroaggregates. This underscores the pivotal role of mesoaggregates and microaggregates in dominating the Q10 of SOM mineralization under soybean-based cropping. In conclusion, legume-based cropping diminishes soil organic matter mineralization despite increasing its temperature sensitivity, which proposes a potential strategy for C-neutral agriculture and climate warming mitigation.
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Affiliation(s)
- Zhengjun Yan
- State Key Laboratory of Maize Bio-breeding, College of Agronomy and Biotechnology, China Agricultural University, Beijing, China
| | - Rong Jia
- State Key Laboratory of Maize Bio-breeding, College of Agronomy and Biotechnology, China Agricultural University, Beijing, China
| | - Jie Zhou
- College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
| | - Kazem Zamanian
- Institute of Soil Science, Leibniz University of Hannover, Herrenhäuser Str. 2, 30419 Hannover, Germany
| | - Yadong Yang
- State Key Laboratory of Maize Bio-breeding, College of Agronomy and Biotechnology, China Agricultural University, Beijing, China
| | - Kevin Z Mganga
- Copernicus Institute of Sustainable Development, Utrecht University, the Netherlands
| | - Zhaohai Zeng
- State Key Laboratory of Maize Bio-breeding, College of Agronomy and Biotechnology, China Agricultural University, Beijing, China; Scientific Observing and Experimental Station of Crop High Efficient Use of Water in Wuqiao, the Ministry of Agriculture and Rural Affairs, Wuqiao 061802, China; Innovation Center of Agricultural Technology for Lowland Plain of Hebei, Wuqiao 061802, China.
| | - Huadong Zang
- State Key Laboratory of Maize Bio-breeding, College of Agronomy and Biotechnology, China Agricultural University, Beijing, China; Scientific Observing and Experimental Station of Crop High Efficient Use of Water in Wuqiao, the Ministry of Agriculture and Rural Affairs, Wuqiao 061802, China; Innovation Center of Agricultural Technology for Lowland Plain of Hebei, Wuqiao 061802, China.
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