Directly quantifying multiple interacting influences on plant competition.
Directly quantifying multiple interacting influences on plant competition.
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DOI：
10.1111/pce.13944
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发表时间：
2020-11
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影响因子：
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通讯作者：
Clare J. Trinder;R. Brooker;H. Davidson;D. Robinson
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文献类型：
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作者：
Clare J. Trinder;R. Brooker;H. Davidson;D. Robinson
当植物竞争时，什么影响这种相互作用？为了回答这个问题，我们直接测量了地下竞争，即在以下因素的影响下，共存的多年生草本植物鸭茅和车前草同时捕获土壤铵和硝酸盐：焦点植物和邻近植物的氮吸收和生物量；位置（良性低地与较恶劣的高地地点）；氮肥利用率（低或高氮肥）；氮离子、铵或硝酸盐的产生（矿化）速率以及竞争类型（种内或种间），作为线性模型中的直接效应或成对相互作用。我们还测量了生物量作为竞争的间接指标。只有三个因素影响竞争性氮吸收和生物量生产：焦点物种身份、氮离子以及氮离子与邻近氮吸收之间的相互作用。位置对氮吸收影响不大，但对生物量生产影响很大。仅在孤立的植物中，氮吸收量随生物量线性增加。我们的结果支持这样一种观点，即测量资源捕获或生物量生产可以告诉您有关竞争对手如何彼此及其环境相互作用的不同信息，并且生物量是植物之间发生的多种单独相互作用（例如氮竞争）结果的长期综合代理。本文受版权保护。版权所有。
When plants compete what influences that interaction? To answer this we measured belowground competition directly, as the simultaneous capture of soil ammonium and nitrate by co-existing herbaceous perennials, Dactylis glomerata and Plantago lanceolata, under the influence of: species identity; N uptake and biomass of focal and neighbour plants; location (benign lowland versus harsher upland site); N availability (low or high N fertilizer); N ion, ammonium or nitrate production (mineralisation) rate, and competition type (intra- or interspecific), as direct effects or pairwise interactions in linear models. We also measured biomass as an indirect proxy for competition. Only three factors influenced both competitive N uptake and biomass production: focal species identity, N ion, and the interaction between N ion and neighbour N uptake. Location had little effect on N uptake but a strong influence on biomass production. N uptake increased linearly with biomass only in isolated plants. Our results support the view that measuring resource capture or biomass production tells you different things about how competitors interact with one another and their environment, and that biomass is a longer-term integrative proxy for the outcomes of multiple separate interactions - such as competition for N - occurring between plants. This article is protected by copyright. All rights reserved.