Operational Soil Warming by Underground Transmission Lines Impacts on Soil Microorganisms and Related Metabolic Activities

IF 2.6 3区农林科学 Q1 AGRONOMY

Journal of Plant Nutrition and Soil Science Pub Date : 2025-03-27 DOI:10.1002/jpln.202400554

Christoph Emmerling, Maren Herzog, Celine Hoffmann, Benjamin Schieber

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引用次数: 0

Abstract

Background

During operation, underground transmission lines (UTLs) emit heat leading to soil warming, especially of the subsoil within the cable trench. This fundamentally changes the natural vertical temperature gradient in soil and the environment of microorganisms and may contribute to the variations in microbe community composition, microbial biomass, and microbial, and enzyme activities. Along with this, N-transformation could result in environmental and groundwater pollution by nitrate-N.

Aims

The aim of the study was to decode the impact of operational (sub)soil warming by UTL on soil microorganisms and their metabolic activities specifically in the subsoil.

Methods

At four study sites along an existing 320 kV UTL near Aachen, Germany, soils were sampled from topsoil to subsoil at 120 cm depths from UTL and control sites. A supplemental laboratory experiment was established to investigate soil samples from the entire soil at specific temperature and moisture conditions.

Results

UTL operation resulted in low (0.6K) to moderate (1.7K) soil warming in topsoil and subsoil, respectively, which partly increased soil DNA content and microbial biomass, abundance of soil bacteria, and metabolic and enzyme activities, especially in subsoil samples. For example, in the topsoil soil, microbial biomass was 13% higher in UTL relative to control and increased extraordinarily by 35%–37% in the subsoil. The abundance of soil bacteria was as well enhanced, but no effect was found for amoA copy numbers. Total Nmin contents were lower in UTL compared to control sites indicating that probably N uptake by vegetation was as well increased.

Conclusions

In prospect of the imminent grid expansion of extra-high voltage transmission lines, there was substantial evidence that the operation of underground cables will not have any critical impact on soil microorganisms and their metabolic activities.

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地下输电线路经营性土壤变暖对土壤微生物及其代谢活动的影响

背景：地下输电线路在运行过程中会放出热量，导致土壤变暖，特别是电缆沟内的底土变暖。这从根本上改变了土壤和微生物环境的自然垂直温度梯度，并可能导致微生物群落组成、微生物生物量以及微生物和酶活性的变化。与此同时，n的转化会导致环境和地下水被硝酸盐- n污染。本研究的目的是解码UTL操作（地下）土壤变暖对土壤微生物及其在地下的代谢活动的影响。方法在德国亚琛附近现有的320 kV UTL沿线的四个研究点，从UTL和对照点的120 cm深度的表土到底土取样。建立了补充室内试验，研究了特定温度和湿度条件下整个土壤的土壤样品。结果UTL操作对表层土壤和底土分别产生了低（0.6K）至中等（1.7K）的升温，土壤DNA含量、微生物生物量、土壤细菌丰度以及土壤代谢和酶活性均有一定程度的提高，尤其是在底土样品中。例如，在表层土壤中，与对照相比，UTL的微生物生物量增加了13%，而在底土中则增加了35%-37%。土壤细菌的丰度也得到了提高，但对amoA拷贝数没有影响。与对照区相比，UTL的总Nmin含量较低，表明植被对N的吸收可能也有所增加。结论针对即将到来的特高压输电线电网扩建，有大量证据表明，地下电缆的运行不会对土壤微生物及其代谢活动产生重大影响。

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

Journal of Plant Nutrition and Soil Science 农林科学-农艺学

CiteScore

4.70

自引率

8.00%

发文量

审稿时长

8-16 weeks

期刊介绍： Established in 1922, the Journal of Plant Nutrition and Soil Science (JPNSS) is an international peer-reviewed journal devoted to cover the entire spectrum of plant nutrition and soil science from different scale units, e.g. agroecosystem to natural systems. With its wide scope and focus on soil-plant interactions, JPNSS is one of the leading journals on this topic. Articles in JPNSS include reviews, high-standard original papers, and short communications and represent challenging research of international significance. The Journal of Plant Nutrition and Soil Science is one of the world’s oldest journals. You can trust in a peer-reviewed journal that has been established in the plant and soil science community for almost 100 years. Journal of Plant Nutrition and Soil Science (ISSN 1436-8730) is published in six volumes per year, by the German Societies of Plant Nutrition (DGP) and Soil Science (DBG). Furthermore, the Journal of Plant Nutrition and Soil Science (JPNSS) is a Cooperating Journal of the International Union of Soil Science (IUSS). The journal is produced by Wiley-VCH. Topical Divisions of the Journal of Plant Nutrition and Soil Science that are receiving increasing attention are: JPNSS – Topical Divisions Special timely focus in interdisciplinarity: - sustainability & critical zone science. Soil-Plant Interactions: - rhizosphere science & soil ecology - pollutant cycling & plant-soil protection - land use & climate change. Soil Science: - soil chemistry & soil physics - soil biology & biogeochemistry - soil genesis & mineralogy. Plant Nutrition: - plant nutritional physiology - nutrient dynamics & soil fertility - ecophysiological aspects of plant nutrition.