Taking sides? Aspect has limited influence on soil environment or litter decomposition in pan-European study of roadside verges

IF 2 3区 农林科学 Q3 ECOLOGY
A. Amstutz , LB. Firth , JI. Spicer , P. De Frenne , L. Gómez-Aparicio , BJ. Graae , S. Kuś , S. Lindmo , A. Orczewska , F. Rodríguez-Sánchez , P. Vangansbeke , T. Vanneste , ME. Hanley
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引用次数: 0

Abstract

In addition to well-known effects on species ecophysiology, phenology, and distributions, climate change is widely predicted to impact essential ecosystem services such as decomposition and nutrient cycling. While temperature and soil moisture are thought to influence litter decomposition, elucidating consistent soil process responses to observed or predicted shifts in climate have proven difficult to evidence. Here we investigated how aspect (i.e., north-south orientation), a natural model for variation in soil temperature, influenced soil physico-chemical conditions and decomposition of two standardised litter types (Green tea and Rooibos teabags) in Pole-facing (PF) and Equator-facing (EF) roadside verges spanning a 3000 km and 27° latitudinal gradient across Europe. Despite average daily temperatures being 1.5 - 3.0 °C warmer on EF than PF slopes, there were only minor region-specific differences in initial soil physico-chemical conditions and short-term variation in litter decomposition (i.e., litter mass loss was higher in EF-verges for the first month of deployment only) associated with aspect. We conclude that previously observed differences in soil environments and the decomposition process associated with slope orientation, is largely litter or environment specific, although medium-term soil-decomposition in semi-natural grassland ecosystems may also be insensitive to the magnitude of temperature variation within the range predicted by the IPCC SSP1–2.6 emissions scenario. Nonetheless, consistent average and extreme temperature differences between adjacent PF- and EF-aspects along roadside verges provides a model system to explore exactly how resilient the soil environment and the micro-organisms responsible for decomposition, are to temperature variation.

偏袒哪一方?在泛欧路边绿化带研究中,地势对土壤环境或垃圾分解的影响有限
除了众所周知的对物种生态生理学、物候学和分布的影响外,气候变化还被广泛预测会影响生态系统的基本服务,如分解和养分循环。虽然温度和土壤湿度被认为会影响废弃物的分解,但要阐明土壤过程对观测到的或预测的气候变化的一致反应却很难证明。在这里,我们研究了土壤温度变化的自然模式--朝向(即南北方向)如何影响朝向极地(PF)和赤道(EF)的路边荒地的土壤理化条件以及两种标准化废弃物(绿茶、路依布和茶包)的分解,这两种废弃物的纬度梯度为 27°,横跨欧洲 3,000 公里。尽管 EF 坡地的日平均气温比 PF 坡地高 1.5 - 3.0 °C,但在初始土壤理化条件和枯落物分解的短期变化(即仅在部署的第一个月,EF 坡地的枯落物质量损失较高)方面,与纬度相关的特定区域差异很小。我们的结论是,尽管半自然草地生态系统的中期土壤分解可能对 IPCC SSP1-2.6 排放情景预测范围内的温度变化幅度不敏感,但之前观察到的与坡向相关的土壤环境和分解过程的差异在很大程度上是针对枯落物或环境的。尽管如此,路边绿化带相邻的 PF 面和 EF 面之间一致的平均温度和极端温度差异提供了一个模型系统,可用于探索土壤环境和负责分解的微生物对温度变化的适应能力。
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来源期刊
Pedobiologia
Pedobiologia 环境科学-生态学
CiteScore
4.20
自引率
8.70%
发文量
38
审稿时长
64 days
期刊介绍: Pedobiologia publishes peer reviewed articles describing original work in the field of soil ecology, which includes the study of soil organisms and their interactions with factors in their biotic and abiotic environments. Analysis of biological structures, interactions, functions, and processes in soil is fundamental for understanding the dynamical nature of terrestrial ecosystems, a prerequisite for appropriate soil management. The scope of this journal consists of fundamental and applied aspects of soil ecology; key focal points include interactions among organisms in soil, organismal controls on soil processes, causes and consequences of soil biodiversity, and aboveground-belowground interactions. We publish: original research that tests clearly defined hypotheses addressing topics of current interest in soil ecology (including studies demonstrating nonsignificant effects); descriptions of novel methodological approaches, or evaluations of current approaches, that address a clear need in soil ecology research; innovative syntheses of the soil ecology literature, including metaanalyses, topical in depth reviews and short opinion/perspective pieces, and descriptions of original conceptual frameworks; and short notes reporting novel observations of ecological significance.
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