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| Soluble organic nitrogen variation rate and its response to bacteria under different fertilization treatments in paddy soil |
| Received:December 27, 2020 |
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| KeyWord:Chinese milk vetch;paddy soil;soluble organic nitrogen;variation rate;bacterial community |
| Author Name | Affiliation | E-mail | | YANG Jing | College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | LIN Yi | College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | YANG Wen-hao | College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Fujian Provincial Key Laboratory of Soil Ecosystem Health and Regulation, Fuzhou 350002, China | | | ZHOU Bi-qing | College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Fujian Provincial Key Laboratory of Soil Ecosystem Health and Regulation, Fuzhou 350002, China | | | MAO Yan-ling | College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Fujian Provincial Key Laboratory of Soil Ecosystem Health and Regulation, Fuzhou 350002, China | | | XING Shi-he | College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
Fujian Provincial Key Laboratory of Soil Ecosystem Health and Regulation, Fuzhou 350002, China | fafuxsh@126.com |
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| Abstract: |
| Soil soluble organic nitrogen（SON）, an important component of the soil active nitrogen pool, plays an important role in plant and microbial uptake and utilization, mineralization, and leaching and loss of nitrogen due to its strong solubility and mobility. However, the response of the soil SON variation rate（VSON）to bacteria remains unclear. In this study, taking subtropical paddy soil as the research object, three treatments were designed： chemical fertilizer（CK）, fertilizer with Chinese milk vetch（CMV1）, and Chinese milk vetch（CMV2）. The dynamics and variation rate of soil SON during the growth period of rice were studied, and the response of VSON to microorganisms was explored. The results showed that the soil SON content under the different fertilization treatments showed a change trend of rapid decrease, then slow fluctuating decrease, and finally steadiness during the growing period of rice. The soil SON content in treatments CMV1 and CMV2 were 16.90% and 20.20% higher than the content in CK, and VSON was 22.26% and 33.37% lower than that in CK, respectively, during the growing period. The soil SON decreased greatly during the early growth period of rice（0~24 d）, and the maximum VSON value was found in the transplanting period（1.02~2.02 mg·kg-1·d-1）. During the growth period of rice, soil VSON was significantly related to the diversity and richness of the bacterial community, but it was not closely related to the bacterial biomass. Redundancy analysis showed that soil VSON was positively correlated with family micrococcaceae of phylum Actinobacteria and negatively related with family Oxalobacteriaceae of phylum Proteobacteria. Different soil microorganisms in different growth stages of rice led to differences in VSON. The soil VSON was more sensitive to the responses of Micrococcaceae and Oxalobacteriaceae in the rice transplanting stage. It was more sensitive to the responses of the phylum Chloroflexi and Oxalobacteriaceae and Solibacteraceae Subgroup_3 in the tillering stage. Soil VSON was more sensitive to phylum Actinobacteria during the rice maturity stage. Therefore, application of Chinese milk vetch can significantly increase soil SON content and reduce soil VSON during the growth period of rice. Soil VSON is closely related to fertilization and growth period, and its responses to bacteria varied. |
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