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首页> 外文期刊>Soil & Tillage Research >Reduced co-occurrence and ion-specific preferences of soil microbial hub species after ten years of irrigation with brackish water
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Reduced co-occurrence and ion-specific preferences of soil microbial hub species after ten years of irrigation with brackish water

机译：在十年内灌溉灌溉后，减少了土壤微生物枢纽物种的共同发生和离子特异性偏好

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Irrigation with brackish water has been widely applied in many regions of the world as an efficient alternative to conserve freshwater resources. Although it has limited soluble salt content, brackish water can alter the physiochemical properties and microbial communities of soil over time. In this study, a cotton field that utilized drip irrigation with brackish water for 10 years (Brackish field) was compared with a nearby field that utilized drip irrigation with fresh water (Fresh field). Our results show the following: 1) After 10 years, the Brackish field was saltier with a greater electrical conductivity and sodium adsorption ratio, as well as less soil organic carbon content when compared with the Fresh field. 2) The more polarized distribution of the most abundant operational taxonomic unit (OTU) was observed in the Brackish field, accompanied by significantly smaller beta diversity, a less clustered network and fewer co-occurrences (edges) within the soil microbial community compared with the less salty Fresh field, altogether demonstrating that long-term brackish irrigation was very likely to form a less diverse and more stressed environment for soil microbes to co-exist. 3) The mismatches between the edge ranking of hub species and the ranking of relative abundances highlight that the predominant abundances of salt tolerant species from genera Acinetobacter and Pseudomonas may help cotton to grow better in the saline soil but may not help to stabilize soil microbial communities. In future studies, sophisticated sampling protocols with high time-resolution are required to fully capture the possible soil microbial responses to event-sensitive ion redistributions across cotton rows as well during repeated irrigation cycles.
机译：咸水灌溉已广泛应用于世界上许多地区，以节省淡水资源的有效替代品。虽然它具有有限的可溶性盐含量，但随着时间的推移，咸水可以改变土壤的生理化学性质和微生物群落。在这项研究中，将滴水灌溉用咸水灌溉10年（咸田）与附近的纯净水（新鲜场）进行了比较。我们的结果显示如下：1）10年后，与新鲜场比较时，咸野的电导率和钠吸附率较少，以及较少的土壤有机碳含量。 2）在咸天场中观察到最丰富的运作分类单位（OTU）的较偏振分布，伴随着明显更小的β多样性，较少的集群网络和土壤微生物群落中的较少的共同发生（边缘）相比较少的咸新鲜场，共同展示了长期的咸水灌溉，很可能形成较差的不同和更加紧张的土壤微生物以共存。 3）轮毂物种的边缘排名与相对丰富的排名之间的不匹配突出，从盐水和假单胞菌的耐盐物种的主要丰富量可能有助于棉花在盐水中更好地生长，但可能没有有助于稳定土壤微生物群体。在未来的研究中，需要具有高时间分辨率的复杂的采样方案，以在重复的灌溉周期内在棉排中完全捕获可能的土壤微生物反应对棉花行的事件敏感的离子再分配。

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