Biochar Application Increases Labile Carbon and Inorganic Nitrogen Supply in a Continuous Monocropping Soil
Biochar is an effective method for increasing soil carbon (C) sequestration and nitrogen (N) supply under continuous monocropping. To investigate the impact of biochar placement methods on soil C and N, a one-year field experiment with five treatments was conducted including control, mineral fertili...
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MDPI AG
2022-03-01
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| Online Access: | https://www.mdpi.com/2073-445X/11/4/473 |
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| author | Rong Huang Bing Li Yulan Chen Qi Tao Qiang Xu Denghong Wen Xuesong Gao Qiquan Li Xiaoyan Tang Changquan Wang |
| author_facet | Rong Huang Bing Li Yulan Chen Qi Tao Qiang Xu Denghong Wen Xuesong Gao Qiquan Li Xiaoyan Tang Changquan Wang |
| author_sort | Rong Huang |
| collection | DOAJ |
| description | Biochar is an effective method for increasing soil carbon (C) sequestration and nitrogen (N) supply under continuous monocropping. To investigate the impact of biochar placement methods on soil C and N, a one-year field experiment with five treatments was conducted including control, mineral fertilizers only (F), biochar hole placement (BFH; biochar applied to the soil layer at 5–10 cm) + F, biochar band placement (BFB; biochar applied to the soil layer at 15–20 cm) + F, and biochar band and hole placement + F (BFBH). The results showed that, regardless of the placement method, biochar application increased soil total organic C (TOC) and C pool management index by 6.9–39.7% and 4.1–36.1%, respectively, especially for dissolved organic C (DOC; 6.9–51.3%), readily oxidizable C (ROC; 2.4–46.4%), and microbial biomass C (MBC; 10.4–41.7%). Single biochar placement methods significantly influenced DOC, MBC, and ROC contents of both soil layers in the rank order of BFH ≈ BFBH > BFB at 0–15 cm and BFB ≈ BFBH > BFH at 15–30 cm. Soil TN and microbial biomass N (MBN) mainly accumulated at the site of biochar placement. The increased soil TOC:TN and MBC:N ratios under biochar treatments promoted inorganic N immobilization and reduced the loss of ammonium N and nitrate N (NO<sub>3</sub><sup>−</sup>-N) through leaching at the early stage of tobacco growth. Biochar-adsorbed N was remobilized at a later period (vigorous growth stage and maturity), possibly causing the slow decrease in NO<sub>3</sub><sup>−</sup>-N content. Additionally, soil C and N pools were significantly influenced by the main effects of soil layer and growth stage. Overall, biochar application increased soil C and N pools and inorganic N supply through N remobilization. However, the increased labile organic C content and microbial activity may prevent C sequestration in biochar-amended soils. |
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| language | English |
| last_indexed | 2024-03-09T04:30:42Z |
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| spelling | doaj.art-409eb512e8844fbcac6d497382ecc06f2023-12-03T13:35:52ZengMDPI AGLand2073-445X2022-03-0111447310.3390/land11040473Biochar Application Increases Labile Carbon and Inorganic Nitrogen Supply in a Continuous Monocropping SoilRong Huang0Bing Li1Yulan Chen2Qi Tao3Qiang Xu4Denghong Wen5Xuesong Gao6Qiquan Li7Xiaoyan Tang8Changquan Wang9College of Resources, Sichuan Agricultural University, Chengdu 611130, ChinaCollege of Resources, Sichuan Agricultural University, Chengdu 611130, ChinaLiangshan Branch of Sichuan Tobacco Corporation, Xichang 615000, ChinaCollege of Resources, Sichuan Agricultural University, Chengdu 611130, ChinaCollege of Resources, Sichuan Agricultural University, Chengdu 611130, ChinaCollege of Resources, Sichuan Agricultural University, Chengdu 611130, ChinaCollege of Resources, Sichuan Agricultural University, Chengdu 611130, ChinaCollege of Resources, Sichuan Agricultural University, Chengdu 611130, ChinaCollege of Resources, Sichuan Agricultural University, Chengdu 611130, ChinaCollege of Resources, Sichuan Agricultural University, Chengdu 611130, ChinaBiochar is an effective method for increasing soil carbon (C) sequestration and nitrogen (N) supply under continuous monocropping. To investigate the impact of biochar placement methods on soil C and N, a one-year field experiment with five treatments was conducted including control, mineral fertilizers only (F), biochar hole placement (BFH; biochar applied to the soil layer at 5–10 cm) + F, biochar band placement (BFB; biochar applied to the soil layer at 15–20 cm) + F, and biochar band and hole placement + F (BFBH). The results showed that, regardless of the placement method, biochar application increased soil total organic C (TOC) and C pool management index by 6.9–39.7% and 4.1–36.1%, respectively, especially for dissolved organic C (DOC; 6.9–51.3%), readily oxidizable C (ROC; 2.4–46.4%), and microbial biomass C (MBC; 10.4–41.7%). Single biochar placement methods significantly influenced DOC, MBC, and ROC contents of both soil layers in the rank order of BFH ≈ BFBH > BFB at 0–15 cm and BFB ≈ BFBH > BFH at 15–30 cm. Soil TN and microbial biomass N (MBN) mainly accumulated at the site of biochar placement. The increased soil TOC:TN and MBC:N ratios under biochar treatments promoted inorganic N immobilization and reduced the loss of ammonium N and nitrate N (NO<sub>3</sub><sup>−</sup>-N) through leaching at the early stage of tobacco growth. Biochar-adsorbed N was remobilized at a later period (vigorous growth stage and maturity), possibly causing the slow decrease in NO<sub>3</sub><sup>−</sup>-N content. Additionally, soil C and N pools were significantly influenced by the main effects of soil layer and growth stage. Overall, biochar application increased soil C and N pools and inorganic N supply through N remobilization. However, the increased labile organic C content and microbial activity may prevent C sequestration in biochar-amended soils.https://www.mdpi.com/2073-445X/11/4/473biocharsoil labile organic Csoil inorganic Nplacement method |
| spellingShingle | Rong Huang Bing Li Yulan Chen Qi Tao Qiang Xu Denghong Wen Xuesong Gao Qiquan Li Xiaoyan Tang Changquan Wang Biochar Application Increases Labile Carbon and Inorganic Nitrogen Supply in a Continuous Monocropping Soil Land biochar soil labile organic C soil inorganic N placement method |
| title | Biochar Application Increases Labile Carbon and Inorganic Nitrogen Supply in a Continuous Monocropping Soil |
| title_full | Biochar Application Increases Labile Carbon and Inorganic Nitrogen Supply in a Continuous Monocropping Soil |
| title_fullStr | Biochar Application Increases Labile Carbon and Inorganic Nitrogen Supply in a Continuous Monocropping Soil |
| title_full_unstemmed | Biochar Application Increases Labile Carbon and Inorganic Nitrogen Supply in a Continuous Monocropping Soil |
| title_short | Biochar Application Increases Labile Carbon and Inorganic Nitrogen Supply in a Continuous Monocropping Soil |
| title_sort | biochar application increases labile carbon and inorganic nitrogen supply in a continuous monocropping soil |
| topic | biochar soil labile organic C soil inorganic N placement method |
| url | https://www.mdpi.com/2073-445X/11/4/473 |
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