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首页> 外文期刊>The Japanese Journal of Veterinary Research >p#pdC and p#eN allocations of two alpine species from early and late snowmelt locations reflect their different growth strategies.
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p#pdC and p#eN allocations of two alpine species from early and late snowmelt locations reflect their different growth strategies.

机译：融雪早期和晚期两个高山物种的p＃pdC和p＃eN分配反映了它们不同的生长策略。

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摘要

Intense efforts are currently devoted to disentangling the relationships between plant carbon (C) allocation patterns and soil nitrogen (N) availability because of their consequences for growth and more generally for C sequestration. In cold ecosystems, only a few studies have addressed whole-plant C and/or N allocation along natural elevational or topographical gradients. p#poC/p#pdC and p#tN/p#eN isotope techniques have been used to elucidate C and N partitioning in two alpine graminoids characterized by contrasted nutrient economies: a slow-growing species, Kobresia myosuroides (KM), and a fast-growing species, Carex foetida (CF), located in early and late snowmelt habitats, respectively, within the alpine tundra (French Alps). CF allocated higher labelling-related p#pdC content belowground and produced more root biomass. Furthermore, assimilates transferred to the roots were preferentially used for growth rather than respiration and tended to favour N reduction in this compartment. Accordingly, this species had higher p#eN uptake efficiency than KM and a higher translocation of reduced p#eN to aboveground organs. These results suggest that at the whole-plant level, there is a compromise between N acquisition/reduction and C allocation patterns for optimized growth.
机译：由于植物碳（C）分配模式对生长以及对碳固存的影响，目前正致力于解决植物碳（C）分配模式与土壤氮（N）可用性之间的关系。在寒冷的生态系统中，只有很少的研究解决了沿自然海拔或地形梯度对整株植物碳和/或氮的分配问题。 p＃poC / p＃pdC和p＃tN / p＃eN同位素技术已被用于阐明两种以营养经济性相反的高山粒状体中的C和N分配：一种缓慢生长的物种，小嵩草（Kobresia myosuroides）（KM）和一种快速生长的物种Carex foetida（CF）分别位于高山苔原（法国阿尔卑斯山）内的融雪早期和晚期融雪地。 CF在地下分配了较高的标记相关p＃pdC含量，并产生了更多的根生物量。此外，转移到根部的同化物优先用于生长而不是呼吸，并且倾向于促进该区室中的氮减少。因此，该物种比KM具有更高的p＃eN吸收效率，并且还原后的p＃eN向地上器官的转运更高。这些结果表明，在整个植物水平上，氮的获取/减少与碳分配模式之间存在折衷，以实现最佳生长。

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