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| Effects of nitrogen reduction combined with rice straw biochar on rice yield traits and soil bacterial community structure and function |
| Received:December 02, 2022 Revised:March 24, 2023 |
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| KeyWord:rice;nitrogen reduction;biochar;yield;bacterial microbial community |
| Author Name | Affiliation | E-mail | | CHEN Hailang | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Tropical Agricultural Environment in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
Guangdong Provincial Key Laboratory of Eco-Cycle Agriculture, Guangzhou 510642, China | | | LUO Jiaxin | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Tropical Agricultural Environment in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
Guangdong Provincial Key Laboratory of Eco-Cycle Agriculture, Guangzhou 510642, China | | | HE Yang | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Tropical Agricultural Environment in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
Guangdong Provincial Key Laboratory of Eco-Cycle Agriculture, Guangzhou 510642, China | | | NING Chuanchuan | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Tropical Agricultural Environment in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
Guangdong Provincial Key Laboratory of Eco-Cycle Agriculture, Guangzhou 510642, China | | | LIU Rui | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Tropical Agricultural Environment in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
Guangdong Provincial Key Laboratory of Eco-Cycle Agriculture, Guangzhou 510642, China | | | TIAN Jihui | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Tropical Agricultural Environment in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
Guangdong Provincial Key Laboratory of Eco-Cycle Agriculture, Guangzhou 510642, China | | | CAI Kunzheng | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China
Key Laboratory of Tropical Agricultural Environment in South China, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China
Guangdong Provincial Key Laboratory of Eco-Cycle Agriculture, Guangzhou 510642, China | kzcai@scau.edu.cn |
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| Abstract: |
| The effects of chemical nitrogen reduction and combined application of rice straw biochar on crop productivity and soil microbial community was investigated in a rice paddy system. A field positioning experiment was designed with six treatments:no nitrogen(CK), conventional nitrogen(N100), 20% nitrogen reduction(N80), 20% nitrogen reduction combined with biochar(N80BC), 40% nitrogen reduction(N60), and 40% nitrogen reduction combined with biochar(N60BC). Nitrogen reduction combined with biochar did not reduce rice yield and significantly increased soil pH and organic carbon(TOC)content. The results of soil microbial sequencing showed that none of the treatments had no significant effect on α diversity index of soil bacteria community. In general, Proteobacteria, Chloroflexi, Acidobacteria, Actinobacteria, and Gemmatimonadetes were the dominant bacterial phyla in paddy soil. Proteobacteria, Gemmatimonadetes, and Actinobacteria increased by 36.8%, 40.7% and 11.3% in N60BC treatment compared with N100 treatment. At the genus level, Sphingomonas, Massilia, and Gemmatimonas increased by 68.6%, 54.0%, and 49.2%, respectively, in N60BC treatment compared with N100 treatment. Based on the results of KEGG analysis, we determined that N60BC treatment significantly increased the amino acid metabolism, carbohydrate metabolism, lipid metabolism, and energy metabolism of soil microorganisms in comparison with N100. The contribution rates of soil total nitrogen(TN), TOC, and pH to bacterial community were 19.4%, 7.4%, and 6.8%, respectively. Pearson analysis showed that soil pH was positively correlated with the relative abundance of Acidobacteria, TN was positively correlated with Proteobacteria and Gemmatimonadetes, and TN was negatively correlated with Chloroflexi and Verrucomicrobia(P<0.05). In conclusion, appropriate nitrogen fertilizer reduction combined with biochar can improve the structure and function of the soil bacteria community and promote the growth of rice; therefore, this combination is a viable management measure for chemical reduction and production stability in paddy fields. |
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