Biodiversity effects on plant stoichiometry.
Biodiversity effects on plant stoichiometry.
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DOI：
10.1371/journal.pone.0058179
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Hillebrand H
中科院分区：
文献类型：
--
作者：
Abbas M;Ebeling A;Oelmann Y;Ptacnik R;Roscher C;Weigelt A;Weisser WW;Wilcke W;Hillebrand H
在生物多样性-生态系统功能的辩论过程中，物种群落的多功能性问题最近已成为一个主要焦点。元素化学计量学与反映植物对生物和非生物环境的多种反应的各种过程有关。因此，可以预期，植物组合的多样性改变了群落水平的植物组织化学。在为期5年的大型草原生物多样性实验(耶拿实验)中，我们探索了地上植物组织中的元素化学计量比(碳、氮、磷和钾的比率)及其与植物多样性的关系。物种丰富度和功能群丰富度影响群落化学计量学，特别是通过增加C：P和N：P比值来影响群落化学计量学。物种或功能群丰富度效应的显着性取决于测试这些术语的顺序，这表明丰富度的这两个方面与豆类和草存在对植物化学成分的预期强烈影响是一致的和互补的。豆科牧草对C：N有拮抗作用(豆科牧草−为27.7%，禾本科牧草为+32.7%)。除了多样性对平均比值的影响外，物种丰富度越高，所有元素比值的化学组成变化越小。多样性对植物化学计量学的影响有几个非排他性的解释：方差的减小可以反映不同化学成分物种的统计平均效应，或者在高多样性时养分吸收的最优化，导致在高多样性时收敛比率。平均比率的变化潜在地反映了随着植物在丰富度较高的情况下生长得更高，茎组织的分配也更高。通过在多年的实验中显示植物多样性和化学计量学之间的第一个联系，我们的结果表明，草原生态系统中失去植物物种将导致草食消费者和地下凋落物投入的饲料的化学成分不那么可靠。
In the course of the biodiversity-ecosystem functioning debate, the issue of multifunctionality of species communities has recently become a major focus. Elemental stoichiometry is related to a variety of processes reflecting multiple plant responses to the biotic and abiotic environment. It can thus be expected that the diversity of a plant assemblage alters community level plant tissue chemistry. We explored elemental stoichiometry in aboveground plant tissue (ratios of carbon, nitrogen, phosphorus, and potassium) and its relationship to plant diversity in a 5-year study in a large grassland biodiversity experiment (Jena Experiment). Species richness and functional group richness affected community stoichiometry, especially by increasing C:P and N:P ratios. The primacy of either species or functional group richness effects depended on the sequence of testing these terms, indicating that both aspects of richness were congruent and complementary to expected strong effects of legume presence and grass presence on plant chemical composition. Legumes and grasses had antagonistic effects on C:N (−27.7% in the presence of legumes, +32.7% in the presence of grasses). In addition to diversity effects on mean ratios, higher species richness consistently decreased the variance of chemical composition for all elemental ratios. The diversity effects on plant stoichiometry has several non-exclusive explanations: The reduction in variance can reflect a statistical averaging effect of species with different chemical composition or a optimization of nutrient uptake at high diversity, leading to converging ratios at high diversity. The shifts in mean ratios potentially reflect higher allocation to stem tissue as plants grew taller at higher richness. By showing a first link between plant diversity and stoichiometry in a multiyear experiment, our results indicate that losing plant species from grassland ecosystems will lead to less reliable chemical composition of forage for herbivorous consumers and belowground litter input.
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影响因子：
5.2
作者：
Oelmann, Yvonne;Buchmann, Nina;Wilcke, Wolfgang
通讯作者：
Wilcke, Wolfgang
影响因子：
4.9
作者：
Oelmann, Yvonne;Potvin, Catherine;Wilcke, Wolfgang
通讯作者：
Wilcke, Wolfgang
影响因子：
64.8
作者：
Elser, JJ;Fagan, WF;Sterner, RW
通讯作者：
Sterner, RW
影响因子：
4.2
作者：
Gubsch, Marlen;Buchmann, Nina;Roscher, Christiane
通讯作者：
Roscher, Christiane
影响因子：
4.8
作者：
Eisenhauer, N.;Bessler, H.;Scheu, S.
通讯作者：
Scheu, S.