长期围栏对中国荒漠草原土壤微生物群落结构和功能的影响

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Journal of Arid Land Pub Date : 2024-03-01 DOI:10.1007/s40333-024-0009-z
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引用次数: 0

摘要

摘要 荒漠草原放牧管理的目标之一是改善其生态系统。然而,人们对放牧管理下荒漠草原生态系统的土壤微生物群落知之甚少。在本研究中,我们调查了长期围栏管理和放牧区 Caragana korshinskii Kom. 灌木群落的多样性和地上生物量,并结合土壤理化性质和基因组学分析,旨在了解围栏管理如何影响中国荒漠草原植物-土壤-微生物之间的相互关系。结果表明,围栏管理(围封)增加了科尔沁草原灌木区的植物多样性和地上生物量,有效提高了土壤有机碳(233.94%)、可利用氮(87.77%)和可利用磷(53.67%)的含量。此外,围栏地块中土壤细菌和真菌的香农指数也更高。植物与土壤的变化深刻影响了土壤细菌的α-和β-多样性。围栏管理也改变了土壤微生物群落结构,显著增加了酸性菌群(5.31%-8.99%)、绿僵菌群(3.99%-5.58%)和球菌群(1.37%-3.28%)的相对丰度。围栏管理下的土壤细菌-真菌共生网络具有更高的复杂性和连通性。根据功能预测,围栏管理显著提高了具有硝化和硝酸盐还原功能的细菌的相对丰度,降低了具有硝酸盐和亚硝酸盐呼吸功能的细菌的相对丰度。在围栏管理下,具有生态功能的真菌,包括丛枝菌根真菌、外生菌根真菌和嗜渍真菌的相对丰度也明显增加。此外,细菌和真菌的功能群差异与植物-土壤变化密切相关。该研究结果对干旱荒漠草原及类似地区的生态恢复和重建具有重要的积极意义。
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Effects of long-term fencing on soil microbial community structure and function in the desert steppe, China

Abstract

One of the goals of grazing management in the desert steppe is to improve its ecosystem. However, relatively little is known about soil microbe communities in the desert steppe ecosystem under grazing management. In this study, we investigated the diversity and aboveground biomass of Caragana korshinskii Kom. shrub communities in long-term fencing and grazing areas, combined with an analysis of soil physical-chemical properties and genomics, with the aim of understanding how fence management affects plant-soil-microbial inter-relationships in the desert steppe, China. The results showed that fence management (exclosure) increased plant diversity and aboveground biomass in C. korshinskii shrub area and effectively enhanced soil organic carbon (233.94%), available nitrogen (87.77%), and available phosphorus (53.67%) contents. As well, the Shannon indices of soil bacteria and fungi were greater in the fenced plot. Plant-soil changes profoundly affected the alpha- and beta-diversity of soil bacteria. Fence management also altered the soil microbial community structure, significantly increasing the relative abundances of Acidobacteriota (5.31%–8.99%), Chloroflexi (3.99%–5.58%), and Glomeromycota (1.37%–3.28%). The soil bacterial-fungal co-occurrence networks under fence management had higher complexity and connectivity. Based on functional predictions, fence management significantly increased the relative abundance of bacteria with nitrification and nitrate reduction functions and decreased the relative abundance of bacteria with nitrate and nitrite respiration functions. The relative abundances of ecologically functional fungi with arbuscular mycorrhizal fungi, ectomycorrhizal fungi, and saprotrophs also significantly increased under fence management. In addition, the differential functional groups of bacteria and fungi were closely related to plant-soil changes. The results of this study have significant positive implications for the ecological restoration and reconstruction of dry desert steppe and similar areas.

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来源期刊
Journal of Arid Land
Journal of Arid Land ENVIRONMENTAL SCIENCES-
CiteScore
4.70
自引率
6.70%
发文量
768
审稿时长
3.2 months
期刊介绍: The Journal of Arid Land is an international peer-reviewed journal co-sponsored by Xinjiang Institute of Ecology and Geography, the Chinese Academy of Sciences and Science Press. It aims to meet the needs of researchers, students and practitioners in sustainable development and eco-environmental management, focusing on the arid and semi-arid lands in Central Asia and the world at large. The Journal covers such topics as the dynamics of natural resources (including water, soil and land, organism and climate), the security and sustainable development of natural resources, and the environment and the ecology in arid and semi-arid lands, especially in Central Asia. Coverage also includes interactions between the atmosphere, hydrosphere, biosphere, and lithosphere, and the relationship between these natural processes and human activities. Also discussed are patterns of geography, ecology and environment; ecological improvement and environmental protection; and regional responses and feedback mechanisms to global change. The Journal of Arid Land also presents reviews, brief communications, trends and book reviews of work on these topics.
期刊最新文献
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