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Hosogoe Y, Nguyen-Sy T, Tang S, Bimantara PO, Sekikawa Y, Kautsar V, Kimani SM, Xu X, Tawaraya K, Cheng W. Five-year vegetation conversion from pasture to C 3 and C 4 plants affects dynamics of SOC and TN and their natural stable C and N isotopes via mediating C input and N leaching. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169481. [PMID: 38142001 DOI: 10.1016/j.scitotenv.2023.169481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 12/03/2023] [Accepted: 12/16/2023] [Indexed: 12/25/2023]
Abstract
Understanding the effects of land-use change on stock and composition of soil organic carbon (SOC) and nitrogen (N) is pivotal for sustainable agriculture and climate change adaption. However, previous studies have often overlooked the specific vegetation type in land-use changes. Therefore, a five-year lysimeter block experiment was conducted, involving non-vegetation, eulalia (C4 plant), and clover (C3 plant) to investigate the impacts of vegetation conversion from pasture on SOC and N dynamics and their natural stable isotopes. Non-vegetation caused 26.21 % and 25.88 % decreases in SOC and total N (TN) contents. Five-year eulalia and clover cultivation maintained stable SOC content, with clover exhibiting higher soil TN content. Eulalia-derived soil C was 1.64-7.58 g C kg-1 and SOC loss in eulalia treatment was 1.86-7.90 g C kg-1. Soil δ13C in eulalia increased at a rate of 0.90 ‰ year-1, significantly surpassing clover and non-vegetation treatments. Conversely, soil δ15N decreased over time, showing insignificant difference among all treatments. Eulalia exhibited significantly higher dry weight and δ13C but lower TN content compared with clover. However, no significant differences were observed in total C and δ15N between the two vegetation treatments. Non-vegetation exhibited higher dissolved organic C concentration than two vegetation treatments in 2017, decreasing over time. Dissolved TN and nitrate concentrations in leachate followed the order clover> non-vegetation> eulalia, with nitrate being the predominant form of N leaching from leachate. Our findings reveal that vegetation conversion affects soil C and N contents, and alters their natural isotopes as well as the leaching of labile soluble nutrients. Notably, non-vegetation consistently reduced SOC and TN contents, whereas eulalia cultivation maintained SOC content, improved C/N ratio and δ13C, and reduced N leaching compared with clover cultivation. These results highlight the potential of eulalia as a candidate plant for enhancing C sequestration and reducing N leaching in cold regions of Japan.
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Affiliation(s)
- Yuka Hosogoe
- Graduate School of Agricultural Sciences, Yamagata University, Tsuruoka 997-8555, Japan
| | - Toan Nguyen-Sy
- The United Graduate School of Agricultural Sciences, Iwate University, Morioka 020-8550, Japan; Faculty of Chemical Technology-Environment, University of Technology and Education-The University of Da Nang, Da Nang 550000, Viet Nam
| | - Shuirong Tang
- Faculty of Agriculture, Yamagata University, Tsuruoka 997-8555, Japan; School of Tropical Agricultural and Forestry (School of Agricultural and Rural Affairs, School of Rural Revitalization), Hainan University, Haikou 570228, China.
| | - Putu Oki Bimantara
- Graduate School of Agricultural Sciences, Yamagata University, Tsuruoka 997-8555, Japan
| | - Yuka Sekikawa
- Faculty of Agriculture, Yamagata University, Tsuruoka 997-8555, Japan
| | - Valensi Kautsar
- The United Graduate School of Agricultural Sciences, Iwate University, Morioka 020-8550, Japan
| | - Samuel Munyaka Kimani
- The United Graduate School of Agricultural Sciences, Iwate University, Morioka 020-8550, Japan
| | - Xingkai Xu
- State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Keitaro Tawaraya
- Faculty of Agriculture, Yamagata University, Tsuruoka 997-8555, Japan
| | - Weiguo Cheng
- Graduate School of Agricultural Sciences, Yamagata University, Tsuruoka 997-8555, Japan; The United Graduate School of Agricultural Sciences, Iwate University, Morioka 020-8550, Japan; Faculty of Agriculture, Yamagata University, Tsuruoka 997-8555, Japan
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