Pedosphere 31(1): 83--93, 2021
ISSN 1002-0160/CN 32-1315/P
©2021 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Responses of soil phosphorus pools accompanied with carbon composition and microorganism changes to phosphorus-input reduction in paddy soils |
Jiahui YUAN1,2, Lei WANG3 , Hao CHEN1,2, Guanglei CHEN1,4, Shenqiang WANG1, Xu ZHAO1, Yu WANG1 |
1State Key Laboratory of Soil and Sustainable Agriculture, Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China)
2University of Chinese Academy of Sciences, Beijing 100049(China)
3Organic Food Development Center, Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042(China)
4College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095(China) |
| ABSTRACT |
| In rice-wheat rotation systems, changes in soil phosphorus (P) pools and microorganisms in rice-growing seasons have been studied; however, further investigations are required to test whether these indexes exhibit different responses in wheat-growing seasons. Additionally, such studies need to include potential variations in soil carbon (C) structure and microbial community composition. In this study, a long-term rice-wheat rotation P-input reduction experiment was conducted to observe the variations in soil P pools and C composition in the 7th wheat season and to investigate the responses of soil enzyme activity and microbial communities. Four P fertilization treatments were included in the experiment, i.e., P application for rice season only (PR), for wheat season only (PW), and for both rice and wheat seasons (PR+W) and no P application in either season (Pzero). Compared with PR+W treatment, Pzero treatment significantly decreased (P < 0.05) labile and stable P pools. Different P fertilization regimes altered soil microbial community composition and enzyme activity, whereas C composition did not vary. However, PW treatment resulted in relatively more O-alkyl-C than PR treatment and the highest number of microorganisms. Besides, the higher ratios of fungi/bacteria and Gram-positive bactetia/Gram-negative bactetia were related to labile C pools, particularly O-alkyl-C, as opposed to recalcitrant C. Our results clarified the status of soil P pools, C chemistry, and the response of microorganisms under dry-farming conditions in the P input-reduced rice-wheat rotation system. |
| Key Words: 13C nuclear magnetic resonance,dry farming,enzyme activity,microbial community composition,phospholipid fatty acid,phosphorus fractionation,wheat season |
| Citation: Yuan J H, Wang L, Chen H, Chen G L, Wang S Q, Zhao X, Wang Y. 2021. Responses of soil phosphorus pools accompanied with carbon composition and microorganism changes to phosphorus-input reduction in paddy soils. Pedosphere. 31(1): 83-93. |
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