Responses of soil microbial community structure under litter to changes in precipitation and nitrogen addition in a desert steppe

IF 3.7 2区农林科学 Q1 ECOLOGY

European Journal of Soil Biology Pub Date : 2024-11-30 DOI:10.1016/j.ejsobi.2024.103696

Jinpeng Ma , Lin Chen , Danbo Pang , Yinglong Chen , Mengyao Wu , Yaqi Zhang , Wenqiang He , Xuebin Li

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引用次数: 0

Abstract

Soil microorganisms are essential in maintaining terrestrial ecosystem function and are central drivers of soil-plant nutrient cycling. However, relatively few studies have explored the impact of precipitation and nitrogen (N) addition on soil microbial community structure beneath litter. In this study, we conducted a field simulation control experiment on litter decomposition under varying precipitation regimes (normal, increased by 30 %, and decreased by 30 %) and N addition levels (0 and 10 g m⁻² y⁻¹) in the desert steppe of Yanchi County, China. Our findings revealed that changes in precipitation and N addition promoted litter decomposition and caused the accumulation of soil nutrients. Specifically, N addition significantly increased nitrate nitrogen (51.95 %), ammonium nitrogen (42.92 %), soil organic carbon (6.81 %), and total phosphorus (7.82 %)(P＜0.05), decreased precipitation significantly elevated contents of nitrate nitrogen (26.80 %), total nitrogen (24.47 %), soil organic carbon (37.62 %), total phosphorus (22.78 %), and microbial biomass C (33.20 %) (P＜0.05). N addition decreased microbial biomarkers content by 1.13 %, but increased microbial diversity indices (Shannon-Wiener index (1.53 %), Brillouin diversity index (0.54 %), Pielou evenness index (1.12 %), Simpson dominance index (0.91 %), Mcintosh diversity index (1.11 %)) (P＜0.05). Meanwhile, decreased precipitation significantly enhanced microbial biomarkers content by 5.83 % and diversity indices (Shannon-Wiener index (3.67 %), Brillouin diversity index (2.16 %), Pielou evenness index (1.55 %), Simpson dominance index (1.82 %), Mcintosh diversity index (2.63 %)) (P＜0.05). We indicated the decreased precipitation enhanced the effect of N addition on microbial community and diversity, while increased precipitation showed the opposite trend. Redundancy analysis highlighted MBC as a critical factor influencing microbial community structure, accounting for 35.3 % of the variation (P＜0.01). This study provides valuable insights into managing and conserving desert steppe ecosystems.

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荒漠草原凋落物下土壤微生物群落结构对降水和氮添加变化的响应

土壤微生物对维持陆地生态系统功能至关重要，是土壤-植物养分循环的核心驱动力。然而，关于降水和氮添加对凋落物下土壤微生物群落结构影响的研究相对较少。在盐池县荒漠草原进行了不同降水（正常、增加30%和减少30%）和N添加水平（0和10 g m−2 y−1）下凋落物分解的野外模拟对照试验。结果表明，降水和施氮量的变化促进了凋落物的分解，引起了土壤养分的积累。其中，氮添加显著提高了硝态氮（51.95%）、铵态氮（42.92%）、土壤有机碳（6.81%）和全磷（7.82%）含量（P<0.05）；降水减少显著提高了硝态氮（26.80%）、全氮（24.47%）、土壤有机碳（37.62%）、全磷（22.78%）和微生物生物量C（33.20%）含量（P<0.05）。添加氮使微生物生物标志物含量降低了1.13%，而微生物多样性指数（Shannon-Wiener指数（1.53%）、Brillouin多样性指数（0.54%）、Pielou均匀度指数（1.12%）、Simpson优势度指数（0.91%）、Mcintosh多样性指数（1.11%））升高（P<0.05）。同时，降水减少使微生物生物标志物含量和多样性指数（Shannon-Wiener指数（3.67%）、Brillouin多样性指数（2.16%）、Pielou均匀度指数（1.55%）、Simpson优势度指数（1.82%）、Mcintosh多样性指数（2.63%））显著提高了5.83% （P<0.05）。结果表明，降水减少增强了氮添加对微生物群落和多样性的影响，而降水增加则相反。冗余分析显示MBC是影响微生物群落结构的关键因素，占变异量的35.3% （P<0.01）。该研究为管理和保护荒漠草原生态系统提供了有价值的见解。

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来源期刊

European Journal of Soil Biology 环境科学-生态学

CiteScore

6.90

自引率

0.00%

发文量

审稿时长

27 days

期刊介绍： The European Journal of Soil Biology covers all aspects of soil biology which deal with microbial and faunal ecology and activity in soils, as well as natural ecosystems or biomes connected to ecological interests: biodiversity, biological conservation, adaptation, impact of global changes on soil biodiversity and ecosystem functioning and effects and fate of pollutants as influenced by soil organisms. Different levels in ecosystem structure are taken into account: individuals, populations, communities and ecosystems themselves. At each level, different disciplinary approaches are welcomed: molecular biology, genetics, ecophysiology, ecology, biogeography and landscape ecology.