温带草原氮沉积和降水制度变化下土壤线虫代谢碳的体型变化

IF 4.6 2区 环境科学与生态学 Q1 ECOLOGY Ecological Processes Pub Date : 2024-02-02 DOI:10.1186/s13717-024-00484-x
Shuyan Cui, Xiaomei Mo, Guo Zheng
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引用次数: 0

摘要

全球气候变化导致降水机制呈现出降雨强度增加但降雨频率减少的趋势。氮(N)沉积是全球氮循环的重要组成部分。线虫的体型是对气候变化做出反应的一种性状,在土壤群落分析中被用作基于性状的标准指标。体型的变化会影响代谢碳(C)。我们通过一项为期 8 年的操纵实验,研究了线虫的体型和代谢碳对降水变化的响应方式,以及氮沉积如何调节这些响应。线虫的体型以群落加权平均(CWM)质量表示。我们量化了蒙古高原半干旱草原上不同降水强度和氮添加条件下土壤线虫的碳代谢成分,包括生产碳、呼吸碳和相应的碳利用效率(CUE)。采用曼特尔检验确定 CWM、CUE 与环境因子之间的相关性。采用偏最小二乘路径模型(PLS-PM)来量化潜变量之间的直接或间接贡献。我们发现,在不添加氮的情况下,强降水强度增加了总线虫和杂食-捕食线虫的 CWM 质量。在所有降水强度处理中,添加氮都会减少食菌体的 CWM 质量。较强的降水强度可能有利于线虫的生产和呼吸C。我们的研究结果为线虫体型和碳代谢的内在机制提供了新的见解,并强调需要进行探索性研究,如操纵实验,以确定体型相关效应的基本性状,并研究它们如何影响线虫的 CUE。这些工作可能会加深我们对降水机制和氮沉积的变化如何改变草地生态系统中土壤线虫群落的理解。
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Body size induced changes in metabolic carbon of soil nematodes under N deposition and precipitation regime change in a temperate grassland
Global climate change has resulted in precipitation regimes exhibiting an increasing trend in rainfall intensity but a reduction in its frequency. Nitrogen (N) deposition is a crucial component of the global N cycling. Nematode body size is a trait that responds to climate change and is used as a standard trait-based indicator in soil community analysis. Variations in body size influence metabolic carbon (C). We examined the ways by which body size and metabolic C of nematodes respond to changing precipitation regimes and how N deposition regulates these responses by an 8-year manipulative experiment. Nematode body size was indicated by the community-weighted mean (CWM) mass. We quantified C metabolism components of soil nematodes including production C, respiration C, and corresponding C use efficiency (CUE) under different precipitation intensities and N addition in a semi-arid steppe on the Mongolian Plateau. The Mantel test was used to determine the correlations between CWM, CUE and environmental factors. The partial least squares path modeling (PLS-PM) was conducted to quantify direct or indirect contributions among latent variables. We found that heavy precipitation intensity increased the CWM mass of total nematodes and omnivores-predators without N addition. N addition decreased CWM mass of bacterivores across all the precipitation intensity treatments. Stronger precipitation intensities might be favorable for nematode production and respiration C. Variations in the nematode CWM mass drove the CUE to change with N addition. Our findings provide new insights into the mechanisms underlying nematode body size and C metabolism, and highlight that explorative studies, such as manipulative experiments, are needed to identify traits underlying size-related effects and to investigate how they affect CUE of nematodes. These efforts may increase our understanding of how changes in precipitation regimes and N deposition may alter soil nematode communities in grassland ecosystems.
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来源期刊
Ecological Processes
Ecological Processes Environmental Science-Ecological Modeling
CiteScore
8.50
自引率
4.20%
发文量
64
审稿时长
13 weeks
期刊介绍: Ecological Processes is an international, peer-reviewed, open access journal devoted to quality publications in ecological studies with a focus on the underlying processes responsible for the dynamics and functions of ecological systems at multiple spatial and temporal scales. The journal welcomes manuscripts on techniques, approaches, concepts, models, reviews, syntheses, short communications and applied research for advancing our knowledge and capability toward sustainability of ecosystems and the environment. Integrations of ecological and socio-economic processes are strongly encouraged.
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