Water-mediated changes in plant–plant and biological soil crust–plant interactions in a temperate forest ecosystem

IF 2.3 3区 环境科学与生态学 Q2 ECOLOGY Web Ecology Pub Date : 2019-04-09 DOI:10.5194/WE-19-27-2019
Clara Pissolito, Irene A. Garibotti, S. Varela, Verónica Arana, M. González-Polo, P. Marchelli, O. Bruzzone
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引用次数: 5

Abstract

Abstract. In the quest to understand how biotic interactions respond to climate change, one area that remains poorly explored is how interactions involving organisms other than vascular plants will respond. However the interactions between plants and biological soil crusts (BSCs) are relevant in many ecosystems and they will likely respond uniquely to climate change. Simultaneous considerations of both plant–plant and plant–BSC interactions may substantially improve our understanding of this topic. The aim of this study is to assess whether water availability differentially affects the biotic effects of BSCs and pioneer shrubs on the early life-history stage of tree seedling growth. We conducted a greenhouse factorial experiment with soil surface cover (bare soil, soil covered by a creeping shrub and BSC covered soil) and water regime (control and drought) as factors. We monitored Nothofagus pumilio (a native tree species of ecological and economic relevance) seedling water status and growth as well as changes in soil water content and soil properties. The shrub cover had a positive effect on soil water conservation and on the water balance of seedlings under water stress. However, its effect was negative for seedling growth under both water conditions. The BSC also contributed to soil water conservation and apparently added nutrients to the soil. The net effect of the BSC on seedling growth was negative under full-watering conditions but positive under water stress conditions. This result highlights how the studied biotic interactions, and especially interactions involving BSCs, depend on changes in water availability.
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温带森林生态系统中植物-植物和生物土壤结壳-植物相互作用的水介导变化
摘要在了解生物相互作用如何对气候变化作出反应的过程中,一个尚未得到充分探索的领域是,除维管植物外,其他生物的相互作用将如何作出反应。然而,植物与生物土壤结皮(BSCs)之间的相互作用在许多生态系统中都是相关的,它们可能对气候变化做出独特的反应。同时考虑植物-植物和植物-平衡记分卡的相互作用可能会大大提高我们对这一主题的理解。本研究的目的是评估水分有效性对BSCs和先锋灌木在树木幼苗生长早期生活史阶段的生物效应是否有差异。我们以土壤表面覆盖(裸土、匍匐灌木覆盖的土壤和BSC覆盖的土壤)和水分状况(控制和干旱)为因子进行了温室因子试验。本研究对具有生态经济价值的乡土树种Nothofagus pumilio幼苗水分状况、生长状况以及土壤含水量和土壤性质的变化进行了监测。灌丛覆盖对水分胁迫下的水土保持和幼苗水分平衡具有积极作用。但在两种水分条件下,其对幼苗生长的影响均为负。平衡记分卡还有助于保持土壤水分,并明显增加土壤养分。在充分浇水条件下,BSC对幼苗生长的净影响为负,而在水分胁迫条件下,净影响为正。这一结果强调了所研究的生物相互作用,特别是涉及BSCs的相互作用如何依赖于水可用性的变化。
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来源期刊
Web Ecology
Web Ecology Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics
CiteScore
4.60
自引率
0.00%
发文量
6
审稿时长
17 weeks
期刊介绍: Web Ecology (WE) is an open-access journal issued by the European Ecological Federation (EEF) representing the ecological societies within Europe and associated members. Its special value is to serve as a publication forum for national ecological societies that do not maintain their own society journal. Web Ecology publishes papers from all fields of ecology without any geographic restriction. It is a forum to communicate results of experimental, theoretical, and descriptive studies of general interest to an international audience. Original contributions, short communications, and reviews on ecological research on all kinds of organisms and ecosystems are welcome as well as papers that express emerging ideas and concepts with a sound scientific background.
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