Salinity as a major influence on groundwater microbial communities in agricultural landscapes

IF 1.8 4区环境科学与生态学 Q2 FISHERIES

Marine and Freshwater Research Pub Date : 2024-01-08 DOI:10.1071/mf23014

Tess Nelson, Grant C. Hose, Jodie Dabovic, Kathryn L. Korbel

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引用次数: 0

Abstract

Context

Understanding the impacts of salinity on groundwater microbial communities is imperative, because these communities influence groundwater chemistry, quality, and its suitability for use by humans and the environment.

Aim

To assess groundwater salinisation and its influence on groundwater microbial communities within the Murray–Darling Basin (MDB), Australia.

Methods

Alluvial aquifers were sampled from 41 bores, within the Lachlan, Murrumbidgee and Murray catchments. Environmental DNA (eDNA), microbial activity and water-quality variables were measured to evaluate microbial communities, which were then correlated with electrical conductivity (EC) and other environmental variables.

Results

Our results indicated widespread groundwater salinisation within the MDB, with EC ranging from 63 to 51 257 μS cm⁻¹. The highest EC values were recorded in the Murray catchment; however, mean EC values did not differ significantly among catchments (P > 0.05). The composition of microbial communities differed significantly between sites with low (<3000 μS cm⁻¹) and high (>3000 μS cm⁻¹) EC. Microbial activity, richness and abundances were all greater at low- than high-EC sites.

Conclusions

Changes to microbial communities as demonstrated here may have impacts on biogeochemical cycling and ecosystem resilience.

Implications

The detrimental ecological impacts of salinity are not limited to groundwater microbes, but present a larger ecological issue affecting all groundwater-dependent ecosystems.

查看原文本刊更多论文

盐度对农业景观中地下水微生物群落的主要影响

背景了解盐度对地下水微生物群落的影响势在必行，因为这些群落会影响地下水的化学性质、水质及其是否适合人类和环境使用。目的评估澳大利亚墨累-达令盆地（MDB）的地下水盐碱化及其对地下水微生物群落的影响。方法在拉克兰流域、墨伦比治流域和墨累流域的 41 个水井中对冲积含水层进行采样。测量了环境 DNA（eDNA）、微生物活性和水质变量，以评估微生物群落，然后将其与电导率（EC）和其他环境变量相关联。结果我们的研究结果表明，MDB 地区的地下水普遍盐碱化，导电率介于 63 到 51 257 μS cm-1 之间。墨累集水区的导电率值最高，但各集水区的平均导电率值差异不大（P > 0.05）。导电率低（<3000 μS cm-1）和导电率高（>3000 μS cm-1）地点的微生物群落组成差异显著。低导电率地点的微生物活性、丰富度和丰度均高于高导电率地点。结论本文所展示的微生物群落变化可能会对生物地球化学循环和生态系统恢复能力产生影响。意义盐度对生态的有害影响不仅限于地下水微生物，而是影响所有依赖地下水的生态系统的一个更大的生态问题。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Marine and Freshwater Research 环境科学-海洋学

CiteScore

4.60

自引率

5.60%

发文量

审稿时长

3.8 months

期刊介绍： Marine and Freshwater Research is an international and interdisciplinary journal publishing contributions on all aquatic environments. The journal’s content addresses broad conceptual questions and investigations about the ecology and management of aquatic environments. Environments range from groundwaters, wetlands and streams to estuaries, rocky shores, reefs and the open ocean. Subject areas include, but are not limited to: aquatic ecosystem processes, such as nutrient cycling; biology; ecology; biogeochemistry; biogeography and phylogeography; hydrology; limnology; oceanography; toxicology; conservation and management; and ecosystem services. Contributions that are interdisciplinary and of wide interest and consider the social-ecological and institutional issues associated with managing marine and freshwater ecosystems are welcomed. Marine and Freshwater Research is a valuable resource for researchers in industry and academia, resource managers, environmental consultants, students and amateurs who are interested in any aspect of the aquatic sciences. Marine and Freshwater Research is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.