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首页> 外文期刊>Annals of Forest Science >Responses to elevated atmospheric CO_2 concentration and nitrogen supply of Quercus ilex L. seedlings from a coppice stand growing at a natural CO_2 spring
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Responses to elevated atmospheric CO_2 concentration and nitrogen supply of Quercus ilex L. seedlings from a coppice stand growing at a natural CO_2 spring

机译：天然CO_2春季生长的小灌木林对栎幼苗大气CO_2浓度和氮供应的响应。

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Quercus ilex acorns were collected from a population of trees with a lifetime exposure to elevated atmospheric CO_2 concentration (CO_2), and after germination seedlings were xposed at two [CO_2](370 or 520 mumol mol~-1) in combination with two soil N treatments (20 and 90 mumol mol~-1 total N) in open-top chambers for 6 months. Increasing [CO_2] stimulated photosynthesis and leaf dark respiration regardless of N treatment. The increase in photosynthesis and leaf dark respiration was associated with a moderate reduction in stomatal conductance, resulting in enhanced instaneous transpiration efficiency in leaves of seedlings in CO_2-enriched air. Elevated [CO_2] increased biomass production only in the high-N treatment. Fine root/foliage mass ratio decreased with high-N treatment and increased with CO_2 enrichment. There was evidence of a preferential shift of biomass to below-ground tissue at a low level of nutrient addition. Specific leaf area (SLA) and leaf area ratio (LAR) decreased significantly in leaves of seedlings grown in elevated [CO_2] irrespective of N treatment. Leaf N concentration decreased significantly in elevated [CO_2] irrespective of N treatment. As a result of patterns of N and carbon concentrations, C/N ratio generally increased with elevated [CO_2] treatment and decreased with high nutrient supply. Afternoon starch concentrations in leaves did not increase significantly with increasing [CO_2], as was the case for morning starch concentrations at low-N supply. Starch concentrations in leaves, stem and roots increased with elevated [CO_2] and decreased with nutrient addition. The concentration of sugars was not significantly affected by either CO_2 or N treatments. Total foliar phenolic concentrations decreased in seedlings grown in elevated [CO_2; irrespective of N treatment, while nitrient supply had less of an effect. We conclude that available soil N will be a major controlling resource for the establishment and growth of Q. ilex in rising [ CO_2] conditions.
机译：从一生长期暴露于升高的大气CO_2浓度（CO_2）的树木中收集栎树橡子，发芽后将幼苗与两种土壤N混合在两种[CO_2]（370或520 mumol mol〜-1）下放置在开顶室中处理（20和90 mumol mol〜-1的总氮）6个月。不论氮肥处理如何，[CO_2]的增加都会促进光合作用和叶片暗呼吸。光合作用的增加和叶片暗呼吸的增加与气孔导度的适度降低有关，从而提高了富含CO_2的空气中幼苗叶片的瞬时蒸腾效率。仅在高氮处理中，升高的[CO_2]增加了生物量的产生。细根/叶质量比随高氮处理而降低，随CO_2富集而增加。有证据表明，在低水平的营养添加下，生物量优先转移到地下组织。与氮肥处理无关，在[CO_2]升高的条件下生长的幼苗叶片的比叶面积（SLA）和叶面积比（LAR）明显降低。不考虑氮处理，在升高的[CO_2]中，叶片氮浓度显着降低。作为氮和碳浓度模式的结果，碳氮比通常随着[CO_2]处理的增加而增加，而随着养分供应量的增加而降低。叶片中的下午淀粉浓度并没有随[CO_2]的增加而显着增加，就像低氮供应下的早晨淀粉浓度一样。叶片，茎和根中的淀粉浓度随[CO_2]的升高而增加，而随着营养物的添加而降低。糖浓度不受CO_2或N处理的影响均不明显。在[CO_2]升高的幼苗中，总的叶面酚浓度降低。不论氮肥处理如何，而供应硝酸盐的影响都较小。我们得出结论，在[CO_2]上升的条件下，可利用的土壤氮将成为Q. ilex的建立和生长的主要控制资源。

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