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| Analysis of soil carbon balance and fungal community diversity in saline-alkali soil under chopped straw returning |
| Received:February 18, 2023 |
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| KeyWord:chopped straw;carbon balance;net ecosystem productivity;CO2 emission;fungal;diversity |
| Author Name | Affiliation | E-mail | | LI Lei | Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China
National Agricultural Environment Yinchuan Observation and Experiment Station, Yinchuan 750002, China | | | LI Xiaohui | Ningxia Survey and Monitor Institute of Land and Resources, Yinchuan 750002, China | | | YAN Longqiang | Gansu Agricultural University, Lanzhou 730070, China | | | ZHU Zhiming | Ningxia Agricultural Technology Extension Station, Yinchuan 750001, China | | | FAN Liqin | Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China
National Agricultural Environment Yinchuan Observation and Experiment Station, Yinchuan 750002, China | | | JI Lidong | Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China
1. Institute of Agricultural Resources and Environment, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China | jili521010@163.com |
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| Abstract: |
| This study aimed to explore the effect of crushed straw returning on soil carbon balance and fungal community diversity in northern Yinchuan, Ningxia, and to achieve the goal of resource utilization of agricultural waste, carbon sequestration, emission reduction, and saline-alkali land improvement. Here, a short-term chopped straw returning experiment was established between 2020 and 2022. According to the principle of in situ absorption of straw, four treatments of total return (CS9000), 2/3 of total return (CS6000), 1/3 of total return (CS3000), and non-return (CS0) were used to analyze the effects of different returning amounts on soil carbon emission, water, heat, salt and alkali factors, and fungal microbial community diversity. The results revealed that compared with CS0 treatment, the total salt of soil decreased by 7.94%-19.57% and the ground temperature increased by 0.11-0.58℃ after large amount of straw returning. Among them, the effect of salt inhibition and warming was evident under CS9000 treatment, and the treatment significantly increased carbon emissions and microbial heterotrophic respiration carbon. Compared with other treatments, CS6000 treatment significantly increased net primary productivity carbon sequestration, and net ecosystem productivity carbon sequestration also significantly increased by 27.11%, 29.41%, and 35.22%, respectively, compared with CS9000, CS3000, and CS0. The carbon balance shows that the farmland under CS6000 and CS3000 treatments was the "sink" of atmospheric CO2 in the ecosystem. Among them, the CS6000 treatment exhibited the best effect on carbon balance, which was helpful in increasing soil carbon sink. In addition, the diversity of soil fungi changed greatly after large amount of straw returning. Compared with the CS0 treatment, the CS6000 treatment significantly increased the Schao1 and Hshannon indices, and this treatment exhibited a significant effect on the dominant communities of Ascomycota, Sordariomycetes, Mortierella, and Fusarium. From the perspective of carbon sequestration, emission reduction, and microbial diversity, a chopped straw returning amount of 6 000 kg·hm-2 was optimal in this area. |
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