| Effects of continuous straw returning on nutrients of soda saline-alkaline paddy soil and fungal community |
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| DOI：10.7606/j.issn.1000-7601.2021.02.03 |
| Key Words: continuous straw returning soda saline-alkaline paddy soil soil nutrient fungal community structure |
| Author Name | Affiliation | | LI Hongyu | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China | | WANG Zhijun | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China | | FAN Mingyu | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China | | LIU Menghong | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China | | LV Yandong | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China | | LIU Lihua | College of Agronomy, Heilongjiang Bayi Agricultura University, Key Laboratory of Crop Genetic, Breeding and Cultivation, Heilongjiang Provincial Department of Education, Daqing, Heilongjiang 163000, China |
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| Abstract: |
| Five treatments including 0 (CK), 3.0 (RS1), 7.5 (RS2), 12.0 (RS3), and 16.5 (RS4) t·hm-2 were set to investigate the effects of continuous straw returning on nutrients of soda saline-alkaline paddy soil and fungal community structure through a pot experiment. The pH, organic matter, total nitrogen (N), total phosphorus (P), total potassium (K), available nutrient content of soil and relative abundance, Alpha diversity and community structure of fungi were determined after five-years straw returning. The results indicated that the total N content significantly decreased by 20.37%~31.48% with the straw returning, and the available N content in RS1 and RS3 treatments decreased by 11.77% and 9.61%, respectively, compared with CK, and the pH significantly increased by 9.39%~12.65%, respectively. The organic matter content in RS4 increased by 11.03% compared with CK. With increasing straw returning amount, the content of total P, available P and available K showed a trend of significant increase, reaching the maximum values in RS4 treatment, which were increased by 15.00%, 49.34%, and 103.81% compared with CK, respectively. Overall, the soda saline-alkali soil was amended by straw returning. Illumina MiSeq sequencing results showed that the relative abundance of Aphelidiomycota, Rotifera, and Anthophyta under 3.0 t·hm-2 was 20.40%, 1.47%, and 0.08% higher than that of control, and the relative abundance of Ascomycota, Basidiomycota, Schizothecium, Zopfiella, Humicola, and Mortierella under 16.5 t·hm-2 was 52.45%, 1.40%, 30.70%, 16.84%, 0.53%, and 0.44% higher compared with control, respectively, indicating that straw returning significantly improved the relative abundance of some phylum and genus of fungi. Straw returning significantly reduced Alpha diversity of soil fungi, with the index of ACE, Chao1, and Shannon decreased by 10.86%~25.32%, 7.81%~26.32%, and 0.25%~31.34%, respectively. The fungal community structure was markedly changed by straw returning, especially in RS3 and RS4 treatments. Further analysis by Redundancy analysis (RDA) and Mental test indicated the fungal community structure was significantly affected by the content of total K (p＜0.05), total P (p＜0.05), available P (p＜0.01), available K (p＜0.01), and organic matter (p＜0.01). Comprehensive analysis showed that straw returning influenced the fungal community structure by regulating the physicochemical properties of soil. |
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