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| Effects of long-term straw incorporation on soil fungal community structure and straw decomposition potential in a rice–wheat rotation system |
| Received:May 08, 2021 |
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| KeyWord:straw incorporation;straw degradation rate;fungal community composition;soil chemical property;rice –wheat rotation;straw decomposing fungi;long-term field experiment |
| Author Name | Affiliation | E-mail | | JI Cheng | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | SUN Yuxiang | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | MENG Yuan | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | LIU Yaobin | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | XU Cong | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | ZHANG Yongchun | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | GU Yian | College of Food Science and Light Industry, Nanjing Tech University, Nanjing 211816, China | yian.gu@hotmail.com;汪吉东，jdwang66@163.com | | WANG Jidong | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | jdwang66@163.com |
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| Abstract: |
| Slow decomposition of straw returned to the field greatly affects crop growth in the next season. However, whether long-term straw incorporation can enrich the straw-decomposing microorganisms and further promote straw degradation efficiency remains unclear. This study investigated the effects of straw incorporation on the soil chemical properties based on a long-term straw incorporation experiment in a typical rice – wheat rotation cropping field in Jiangsu Province. Additionally, this study explored the effects of straw incorporation on the fungal community composition using the high-throughput amplicon sequencing method, and tested the wheat straw degradation rates using the buried bag method. Results showed that straw incorporation significantly decreased soil pH, while increased soil electrical conductivity（EC）. Soil dissolved organic carbon, total phosphorus, and total carbon contents increased by 23%, 24%, and 2%, respectively. Additionally, straw incorporation substantially altered the fungal community structure. The diversity of soil fungal community was significantly decreased following straw incorporation. Ascomycota was the dominant phylum in the soils and its relative abundance was significantly increased by 25% following straw incorporation. At the genus level, the relative abundances of Schizothecium, Sarocladium, Gibberella, Rhizophlyctis, Lindtneria, Cryptococcus, and Myrothecium were also significantly increased by 2.5~132.3 times. The enriched fungal taxa induced by straw incorporation increased the rates of wheat straw degradation by 37%, compared with those in the soils without straw incorporation. These results reveal that long-term straw incorporation can increase straw decomposing rate via increasing the abundance of potential straw-decomposing fungal taxa. |
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