Warming alters competition for organic and inorganic nitrogen between co-existing grassland plant species
Warming alters competition for organic and inorganic nitrogen between co-existing grassland plant species
复制标题
DOI：
10.1007/s11104-016-2856-7
复制
发表时间：
2016-09-01
期刊：
影响因子：
4.9
通讯作者：
Bardgett, Richard D.
中科院分区：
文献类型：
--
作者：
Kuster, Thomas M.;Wilkinson, Anna;Bardgett, Richard D.
不同的草种可能会获得不同形式的氮（N），以减少对相同资源的竞争。通过盆栽试验研究了气候变暖对羊茅草（Festuca ovina）和飞机花（Anthoxanthum odoratum）不同形态氮素吸收和竞争作用的影响。植物在单一栽培或混合物中生长，并且在环境温度或升高的温度（+10A ℃）下，并且供应有C-13和N-15同位素以测试对铵、丙氨酸或三丙氨酸的相对吸收的处理效果。与此相反，当生长在混合物中时，F. ovina对三种供氮形式的吸收量相等，而A. odoratum转换为三丙氨酸作为主要的N形式。在温暖的条件下，这两个物种采取了同样的N形式，无论竞争treatment.We已经表明，草种生长在混合物中，并在环境条件下，通过获得不同的N形式减少竞争。变暖增加了土壤中无机氮的可用性，因此解除了对氮形态差异吸收的需求。
Grass species may acquire different forms of nitrogen (N) to reduce competition for the same resources. Climate change influences the availability of soil N and is therefore likely to cause shifts in N forms acquired by plants, thereby affecting their competitive interactions.We investigated the effects of warming on the uptake of different N forms and competitive interactions of Festuca ovina and Anthoxanthum odoratum in a pot experiment. The plants were grown either in monocultures or mixture, and at ambient or elevated temperature (+10 A degrees C), and supplied with C-13 and N-15 isotopes to test for treatment effects on the relative uptake of ammonium, alanine or tri-alanine.Both grass species took up relatively more N supplied as ammonium than as alanine or tri-alanine when grown under ambient conditions in monoculture. In contrast, when grown in mixtures, F. ovina took up the three supplied N forms in equal amounts, whereas A. odoratum switched to tri-alanine as the main N form. Under warmed conditions, both species took up the N forms equally, irrespective of competition treatments.We have shown that grass species grown in mixture and under ambient conditions reduce competition by acquiring different N forms. Warming increased the availability of inorganic N in the soil and therefore deregulated the need for differential uptake of N forms.