Effects of Mixed Saline and Fresh Water Sprinkler Irrigation on the Rhizosphere Soil Microbial Community of Summer Maize

Tieqiang Wang, Zikang Guo, Hanbo Wang (), Weidong Li, Wenxu Sheng, Shuantang Zhang and Dasheng Zhang
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Tieqiang Wang: Hebei Technology Innovation Center of Agricultural Water Saving, Hebei Institute of Water Science, Shijiazhuang 050051, China
Zikang Guo: Hebei Key Laboratory of Crop Stress Biology, College of Agronomy and Biotechnology, Hebei Normal University of Science and Technology, Qinhuangdao 066000, China
Hanbo Wang: Hebei Technology Innovation Center of Agricultural Water Saving, Hebei Institute of Water Science, Shijiazhuang 050051, China
Weidong Li: Hebei Yellow River Diversion Project Affairs Center, Shijiazhuang 050035, China
Wenxu Sheng: Hebei Key Laboratory of Crop Stress Biology, College of Agronomy and Biotechnology, Hebei Normal University of Science and Technology, Qinhuangdao 066000, China
Shuantang Zhang: Hebei Technology Innovation Center of Agricultural Water Saving, Hebei Institute of Water Science, Shijiazhuang 050051, China
Dasheng Zhang: Hebei Technology Innovation Center of Agricultural Water Saving, Hebei Institute of Water Science, Shijiazhuang 050051, China

Agriculture, 2024, vol. 14, issue 12, 1-14

Abstract: Mixing saline and fresh water can help to increase the agricultural water utilization rate and solve the water shortage situation, but its role on rhizosphere microbes is unknown. This study revealed the effects of mixed saline and freshwater sprinkler irrigation at different proportions on the rhizosphere soil microbial community of summer maize. Compared to freshwater sprinkler irrigation, sprinkler irrigation with 2 g·L −1 of mixed saline and fresh water significantly increased the bacterial α-diversity and significantly affected the structure and composition of bacterial communities, increasing the number of OTUs, the ACE index, and the Shannon index in the rhizosphere soils, whereas sprinkler irrigation with 3 g·L −1 did not lead to significant changes. In addition, there was a significant difference in β -diversity between the mixed saline and freshwater sprinkler irrigation and the freshwater sprinkler irrigation. Principal coordinate analysis revealed that the 2 g·L −1 and 3 g·L −1 sprinkler irrigation treatments were closer to each other, but both were at a greater distance from the freshwater sprinkler irrigation, indicating that mixed saline and freshwater irrigation significantly affected the structure of rhizosphere soil bacterial communities. Ammonium nitrogen, alkaline dissolved nitrogen, and total nitrogen all affected the soil bacterial community structure by more than 10%, with ammonium nitrogen being the most influential environmental factor. The relative abundance of most microbes in the mixed saline and freshwater sprinkler treatments was positively correlated with ammonium nitrogen, especially in the 2 g·L −1 treatment, while that of most microbes in the freshwater sprinkler treatment was negatively correlated with ammonium nitrogen. In conclusion, selecting a sprinkler irrigation model with a mineralization level of mixed saline and freshwater not exceeding 2 g·L −1 could enhance the rhizosphere soil microbial community while conserving water resources.

Keywords: brackish water irrigation; rhizosphere soil bacteria; biodiversity; community structure; summer maize (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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