| Characteristics of soil factors, microbial quantity and enzyme activity in potato root layer in Yulin sandy soil area |
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| DOI：10.7606/j.issn.1000-7601.2022.04.22 |
| Key Words: potato sandy soil area soil factors enzyme activity microbial quantity |
| Author Name | Affiliation | | XIE Kui | College of life sciences, Yan’an University Yan’an， Shaanxi 716000, China | | ZHANG Teng | College of life sciences, Yan’an University Yan’an， Shaanxi 716000, China | | LI Zhuoyuan | College of life sciences, Yan’an University Yan’an， Shaanxi 716000, China | | MI Feiyao | College of life sciences, Yan’an University Yan’an， Shaanxi 716000, China | | LI Yuan | College of life sciences, Yan’an University Yan’an， Shaanxi 716000, China | | ZHANG Fan | College of life sciences, Yan’an University Yan’an， Shaanxi 716000, China | | WANG Xiukang | College of life sciences, Yan’an University Yan’an， Shaanxi 716000, China |
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| Abstract: |
| 16 local potato varieties were selected for the experiment. Single factor analysis and redundancy analysis were used to analyze the soil water content, pH, electrical conductivity, alkali hydrolyzable nitrogen, available phosphorus, available potassium, organic matter content, catalase, urease and sucrase activities as well as the number of soil bacteria, fungi and actinomycetes in Yulin sandy soil area. The results showed that in 0~60 cm soil layer, the activities of catalase and urease in potato root layer in Yulin sandy soil area decreased with the increase of soil depth. The activity of soil sucrase increased first and then decreased with the increase of soil depth. The activity of peroxidase in 0~20 cm soil layer was 0.03% and 28.74% higher than that in 20~40 cm and 40~60 cm soil layers, respectively. The urease activity in 0~20 cm soil layer was 14.10% and 169.70% higher than that in 20~40 cm and 40~60 cm soil layers respectively. The sucrase activity in 20~40 cm soil layer was 21.74% and 59.53% higher than that in 0~20 cm and 40~60 cm soil layers respectively. In the 0~40 cm soil layer, the number of soil bacteria, fungi and actinomycetes decreased with the increase of soil depth. The number of bacteria was dominant among the three types of microorganisms, accounting for 83.11%~97.28% of the total number of microorganisms followed by actinomycetes, accounting for 2.49%~16.49% of the total number of microorganisms. The number of fungi was the least, accounting for 0.13%~0.44% of the total number of microorganisms. The soil moisture content, pH and conductivity of the root layer (0~60 cm) of different potato cultivars were in the range of 2.94%~8.00%, 8.30~8.79 μS·cm-1 and 101.92~210.87 μS·cm-1, respectively. The contents of alkaline nitrogen, available phosphorus, available potassium and organic matter were in the range of 16.47~30.14 mg·kg-1, 15.37~25.49 mg·kg-1, 95.83~163.60 mg·kg-1 and 2.85~5.43 g·kg-1, respectively. The correlation analysis showed that the activities of catalase, urease and sucrase in potato root layer were significantly positively correlated with the contents of soil alkali hydrolyzable nitrogen and organic matter (P<0.01), and the activities of soil bacteria, fungi and actinomycetes were significantly positively correlated with soil organic matter, available phosphorus and available potassium (P<0.01). Potato tuber yield was significantly positively correlated with soil bacteria (P<0.01), and tuber soluble total sugar was significantly positively correlated with soil actinomycetes (P<0.05). Redundancy analysis showed that alkali hydrolyzable nitrogen and organic matter were the main driving factors for the change of soil catalase and urease activities. Organic matter and available phosphorus were the main driving factors for the change of soil bacteria. Available potassium was the main driving factor for the change of soil fungi and actinomycetes. |
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