Directly quantifying multiple interacting influences on plant competition

被引:14
|
作者
Trinder, Clare J. [1 ]
Brooker, Rob W. [2 ]
Davidson, Hazel [1 ]
Robinson, David [1 ]
机构
[1] Univ Aberdeen, Sch Biol & Environm Sci, Aberdeen AB24 3UU, Scotland
[2] James Hutton Inst, Ecol Sci, Aberdeen, Scotland
来源
PLANT CELL AND ENVIRONMENT | 2021年 / 44卷 / 04期
基金
英国自然环境研究理事会;
关键词
N-15; ammonium; Dactylis glomerata; direct uptake; interspecific competition; intraspecific competition; isotope pool‐ dilution; nitrate; Plantago lanceolata; INTERSPECIFIC COMPETITION; GROWTH; MECHANISMS; DYNAMICS; NITRATE; SIZE; SOIL;
D O I
10.1111/pce.13944
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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.
引用
收藏
页码:1268 / 1277
页数:10
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