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Effects of water-saving irrigation on microbial community structures, assembly, and metabolic activities in alfalfa rhizosphere soils

文献类型： 外文期刊

作者： Ding, Feng 1 ; Ji, Shun 3 ; Sa, Renna 2 ; Nin, Chenbo 3 ; Ma, Feng 1 ; Yan, Haijun 1 ;

作者机构： 1.China Agr Univ, Coll Water Resources & Civil Engn, Beijing 100083, Peoples R China

2.Xinjiang Acad Agr Sci, Res Inst Soil Fertilizer & Agr Water Conservat, Urumqi 830091, Xinjiang, Peoples R China

3.Xinjiang Acad Agr Sci, Comprehens Testing Ground, Urumqi 830091, Xinjiang, Peoples R China

4.Minist Agr & Rural Affairs, Key Lab Northwest Oasis Water Saving Agr, Urumqi 830091, Xinjiang, Peoples R China

关键词： Water conservation; Community assembly; Rhizosphere microbe; Ecological effect

期刊名称：INTERNATIONAL MICROBIOLOGY （ 影响因子：2.3； 五年影响因子：2.7 ）

ISSN： 1139-6709

年卷期： 2025 年

页码：

收录情况： SCI

摘要： In agricultural areas of arid Xinjiang, China, selecting appropriate irrigation strategies for farmland is essential. Increasing attention is being paid to the ecological effects of different irrigation methods on the soil environment. As a crucial component of soil quality, the microbial community is a key indicator of the impacts of irrigation on the soil environment. To investigate the effects of irrigation treatments on the properties of rhizosphere soil and the underlying microbial community characteristics, this study conducted an alfalfa field experiment applying three water-saving treatments (3750, 4500, and 5250 m3 hm-2) and regular irrigation (6750 m3 hm-2, CK). The results showed that the water-saving treatments increased the soil pH, salinity, available nitrogen, and phosphorus levels. The water-saving treatments decreased the richness and diversity of the bacterial community in the rhizosphere but increased those of the fungal community. The influence of stochastic processes on fungal and bacterial communities assembly under water-saving treatments was more noticeable than that under CK. Compared with CK, water-saving treatments reduced the complexity of microbial network and increased the potential negative interaction between bacteria and fungi. Functional prediction analysis showed that species specificity among treatments may result from a specific selection of rhizosphere functional requirements. This study reveals the effect of controlling irrigation quantity on protecting soil microbial diversity and function and improves the understanding of rhizosphere soil community response affected by different irrigation strategies. The results facilitate the development of effective and beneficial agricultural measures.

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