Land use drives prokaryotic community composition of directly adjacent grasslands

IF 5.1 1区 农林科学 Q1 SOIL SCIENCE
Rubén Martínez-Cuesta, Anna Holmer, Franz Buegger, Michael Dannenmann, Michael Schloter, Stefanie Schulz
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引用次数: 0

Abstract

Understanding the impact of agricultural land use on the soil prokaryotic communities in connected downslope sites is crucial for developing sustainable strategies to preserve ecosystem properties and mitigate agriculture’s environmental impacts. In this study, we investigated topsoil samples collected at three time points in 2022 (March, June, and November) from two adjacent catenas, reaching from hillslope to floodplain. The catenas differed in land use (extensive grassland vs. extensive cropland) at the top and middle parts, while the floodplain remained an extensive grassland due to legal restrictions. Using quantitative real-time PCRs and metabarcoding, we assessed prokaryotic abundance and prokaryotic community composition. Results show higher bacterial abundance in the cropland-influenced floodplain part across all time points compared to the grassland-influenced floodplain part. Temporal dynamics revealed a progressive decrease in the shared prokaryotic communities of the floodplain parts, peaking at the summer sampling time point, indicating a significant influence of the respective management type of the agricultural sites over the bacterial and archaeal communities of the floodplain parts. Differential abundance analyses identified several nitrifying taxa as more abundant in the cropland-influenced floodplain. Upstream land use also influenced the prokaryotic network of the cropland-floodplain, with some cropland taxa becoming keystone taxa and altering network morphology, an effect not observed in the grassland-influenced floodplain. These findings suggest that upstream agricultural land use practices have exerted a long-term influence on the floodplain prokaryotic communities over the past three decades. Moreover, there is evidence suggesting that these prokaryotic communities may undergo a potential reset during winter, which requires further investigation.

Abstract Image

土地利用驱动直接相邻草地的原核生物群落组成
了解农业用地使用对相连下坡地块土壤原核生物群落的影响,对于制定可持续战略以保护生态系统特性和减轻农业对环境的影响至关重要。在这项研究中,我们调查了 2022 年三个时间点(3 月、6 月和 11 月)从山坡到洪泛平原的两个相邻耕地采集的表土样本。这两个耕地的顶部和中部的土地利用方式不同(大面积草地和大面积耕地),而洪泛区由于法律限制仍为大面积草地。我们利用实时定量 PCR 和代谢编码技术评估了原核生物的丰度和原核生物群落的组成。结果显示,与受草原影响的洪泛区相比,受耕地影响的洪泛区在所有时间点的细菌丰度都较高。时间动态分析显示,洪泛区的共有原核生物群落逐渐减少,在夏季采样时间点达到顶峰,这表明农业区各自的管理类型对洪泛区的细菌和古细菌群落有显著影响。丰度差异分析表明,在受耕地影响的洪泛区,一些硝化类群的数量较多。上游土地利用也影响了耕地-洪泛平原的原核生物网络,一些耕地类群成为关键类群并改变了网络形态,而在受草地影响的洪泛平原却没有观察到这种影响。这些研究结果表明,在过去的三十年中,上游农业土地利用方式对洪泛区原核生物群落产生了长期影响。此外,有证据表明,这些原核生物群落在冬季可能会发生重置,这需要进一步研究。
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来源期刊
Biology and Fertility of Soils
Biology and Fertility of Soils 农林科学-土壤科学
CiteScore
11.80
自引率
10.80%
发文量
62
审稿时长
2.2 months
期刊介绍: Biology and Fertility of Soils publishes in English original papers, reviews and short communications on all fundamental and applied aspects of biology – microflora and microfauna - and fertility of soils. It offers a forum for research aimed at broadening the understanding of biological functions, processes and interactions in soils, particularly concerning the increasing demands of agriculture, deforestation and industrialization. The journal includes articles on techniques and methods that evaluate processes, biogeochemical interactions and ecological stresses, and sometimes presents special issues on relevant topics.
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