A new hammer to crack an old nut: interspecific competitive resource capture by plants is regulated by nutrient supply, not climate.
A new hammer to crack an old nut: interspecific competitive resource capture by plants is regulated by nutrient supply, not climate.
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DOI：
10.1371/journal.pone.0029413
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发表时间：
2012
期刊：
影响因子：
3.7
通讯作者：
Robinson D
中科院分区：
文献类型：
--
作者：
Trinder CJ;Brooker RW;Davidson H;Robinson D
尽管很少得到承认，但我们对竞争如何受到环境驱动因素的调节的理解受到了严重阻碍，因为我们依赖于对结果的间接衡量，而不是竞争的过程。为了克服这个问题，我们对植物对土壤氮(N)的竞争进行了直接测量。采用同位素池稀释法，考察了土壤资源限制和气候严重度对两种常见草地物种间的交互作用。池稀释法估计在规定的时间段内对总氮的吸收，而不是像大多数其他示踪剂实验中使用的那样简单地吸收15N标记。N的竞争吸收由其有效形态(NO3、−或NH4+)决定。土壤氮素有效性比植物生长的气候条件(地点)的影响更大。这一结果并不完全支持当前关于竞争与环境条件的作用的两种主流理论。我们发现没有证据支持蒂尔曼的理论，即与高营养水平相比，低营养水平下对土壤养分的竞争更强，并部分支持格里姆的理论，即在潜在的更多产的条件下，对土壤养分的竞争更大。这些结果展示了植物资源竞争的动态本质，提供了新的见解。
Although rarely acknowledged, our understanding of how competition is modulated by environmental drivers is severely hampered by our dependence on indirect measurements of outcomes, rather than the process of competition. To overcome this, we made direct measurements of plant competition for soil nitrogen (N). Using isotope pool-dilution, we examined the interactive effects of soil resource limitation and climatic severity between two common grassland species. Pool-dilution estimates the uptake of total N over a defined time period, rather than simply the uptake of 15N label, as used in most other tracer experiments. Competitive uptake of N was determined by its available form (NO3 − or NH4 +). Soil N availability had a greater effect than the climatic conditions (location) under which plants grew. The results did not entirely support either of the main current theories relating the role of competition to environmental conditions. We found no evidence for Tilman's theory that competition for soil nutrients is stronger at low, compared with high nutrient levels and partial support for Grime's theory that competition for soil nutrients is greater under potentially more productive conditions. These results provide novel insights by demonstrating the dynamic nature of plant resource competition.
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影响因子：
4.8
作者：
Armas, C;Ordiales, R;Pugnaire, FI
通讯作者：
Pugnaire, FI
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通讯作者：
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通讯作者：
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