| Distribution characteristics of rhizosphere soil fungal community and root growth in sainfoin field with different planting years |
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| DOI：10.7606/j.issn.1000-7601.2023.02.13 |
| Key Words: sainfoin planting years root morphology rhizosphere soil fungal community |
| Author Name | Affiliation | | YAO Yuheng | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassl and Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | NAN Lili | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassl and Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | LIANG Pengfei | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassl and Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | LI Jingfeng | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassl and Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | MA Biao | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassl and Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | XIA Jing | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassl and Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China | | ZHANG Zelong | College of Pratacultural Science, Gansu Agricultural University, Key Laboratory of Grassl and Ecosystem, Ministry of Education, Lanzhou, Gansu 730070, China |
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| Abstract: |
| A field study was conducted to explore distribution and succession characteristics of sainfoin root growth and rhizosphere soil fungal communities in different planting years (1, 2, 3 a and 4 a) and provide a scientific basis for the sustainable use of sainfoin artificial grassland in arid desert oasis. Rhizosphere soil chemical properties and enzyme activities were analyzed while soil microbial DNA was extracted for PCR amplification and high throughput sequencing. Results showed that with the increase of planting years, crown diameter and depth, lateral and taproot diameters, numbers of lateral root and crown branches increased, and each index in four\|year sainfoin field was 3.7, 3.1, 5.0, 3.4, 2.0， 3.6 times than that of one\|year sainfoin field, respectively. The average root diameter, root volume, total root surface area, total root length, and root tip numbers increased first and then decreased. The pH and available phosphorus content reduced significantly, available potassium and available nitrogen contents decreased after an initial increase. The dehydrogenase, catalase, urease, and alkaline phosphatase activities increased significantly, and each index in four\|year sainfoin field was 3.3, 1.9, 10.3， 1.4 times than that of one\|year sainfoin field, respectively. The richness estimators of Ace and Chao1 and the diversity indices of Shannon and Simpson were activated first and then inhibited; Ascomycota, Mucoromycota, Chytridiomycota, and Mortierellomycota were the dominant fungal groups in sainfoin field, and the relative abundance of Ascomycota increased remarkably, whereas the relative abundance of other dominant fungi increased first and then decreased. The predominant taxa at the genus level were Monographellahe and Fusarium, and the relative abundance of Monographellahe increased significantly, while the relative abundance of Fusarium dropped significantly. Redundancy analysis and Monte Carlo permutation tests showed that available phosphorus content was the main factor affecting the soil fungal community structure. |
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