Responses of plant diversity and soil microorganism diversity to nitrogen addition in the desert steppe, China

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Journal of Arid Land Pub Date : 2024-03-04 DOI:10.1007/s40333-024-0008-0
He Ye, Mei Hong, Xuehui Xu, Zhiwei Liang, Na Jiang, Nare Tu, Zhendan Wu
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Abstract

Nitrogen (N) deposition is a significant aspect of global change and poses a threat to terrestrial biodiversity. The impact of plant-soil microbe relationships to N deposition has recently attracted considerable attention. Soil microorganisms have been proven to provide nutrients for specific plant growth, especially in nutrient-poor desert steppe ecosystems. However, the effects of N deposition on plant soil microbial community interactions in such ecosystems remain poorly understood. To investigate these effects, we conducted a 6-year N-addition field experiment in a Stipa breviflora Griseb. desert steppe in Inner Mongolia Autonomous Region, northern China. Four N treatment levels (N0, N30, N50, and N100, corresponding to 0, 30, 50, and 100 kg N/(hm2•a), respectively) were applied to simulate atmospheric N deposition. The results showed that N deposition did not significantly affect the aboveground biomass of desert steppe plants. N deposition did not significantly reduce the alfa-diversity of plant and microbial communities in desert steppe, and low and mediate N additions (30 and 50 kg N/(hm2•a)) had a promoting effect on them. The variation pattern of plant Shannon index was consistent with that of the soil bacterial Chao1 index. N deposition significantly affected the beta-diversity of plants and soil bacteria, but did not significantly affect fungal communities. In conclusion, N deposition led to co-evolution between desert steppe plants and soil bacterial communities, while fungal communities exhibited strong stability and did not undergo significant changes. These findings help clarify atmospheric N deposition effects on the ecological health and function of the desert steppe.

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中国荒漠草原植物多样性和土壤微生物多样性对氮添加的响应
氮(N)沉积是全球变化的一个重要方面,对陆地生物多样性构成威胁。植物与土壤微生物的关系对氮沉降的影响最近引起了广泛关注。事实证明,土壤微生物可为特定植物的生长提供养分,尤其是在养分贫乏的沙漠草原生态系统中。然而,人们对氮沉积对此类生态系统中植物-土壤微生物群落相互作用的影响仍然知之甚少。为了研究这些影响,我们在中国北方内蒙古自治区的Stipa breviflora Griseb.荒漠草原上进行了为期6年的氮添加田间试验。试验采用了四种氮处理水平(N0、N30、N50 和 N100,分别相当于 0、30、50 和 100 kg N/(hm2-a))来模拟大气中的氮沉降。结果表明,氮沉降对荒漠草原植物的地上生物量没有显著影响。氮沉降并没有明显降低荒漠草原植物和微生物群落的多样性,而低氮和中氮添加量(30 和 50 kg N/(hm2-a))对它们有促进作用。植物香农指数的变化规律与土壤细菌 Chao1 指数的变化规律一致。氮沉积对植物和土壤细菌的贝塔多样性有明显影响,但对真菌群落没有明显影响。总之,氮沉降导致荒漠草原植物和土壤细菌群落的共同进化,而真菌群落则表现出很强的稳定性,没有发生明显变化。这些发现有助于阐明大气氮沉降对荒漠草原生态健康和功能的影响。
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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.
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