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中文摘要：
利用封闭式生长室，研究了CO2浓度升高（环境CO2＋350μmol·mol^-1，Ec）、温度升高（环境温度＋2℃，ET）以及二者同时升高（ECT）对川西亚高山红桦幼苗养分积累和分配的影响．结果表明：经过一个生长季，Ec处理下红桦幼苗单株N、P、K积累比对照分别增加44％、45％和11％（P〈0．05），ET处理下分别增加37％、76％和9％（P〈0．05），ECT处理下分别增加24％、88％和20％（P〈0．05）．Ec处理使N向红桦幼苗叶中分配的比例降低11．68％（P〈0．05），向枝、茎、根中分配的比例分别增加2．95％、3．39％和5．34％（P〉0．05）；ET处理使N向叶中分配的比例增加11．09％（P〈0．05），向枝、茎、根中分配的比例分别降低0．69％、10．35％和0．05％（P〉0．05）．ECT处理下N的分配格局与Ec处理相似．3种处理下P和K在红桦幼苗中的分配变化差异较大，CO2浓度和温度升高可能促进植物养分的积累，改变养分在植物各器官间的分配．
英文摘要：
With enclosed chamber system, this paper studied the effects of elevated CO2 concentration （ ambient ＋ 350 μmol·mol^-1, Ec ）, temperature （ ambient ＋ 2 ℃, ET ） , and their combination （ ECT ） on the nutrient accumulation and allocation in subalpine Betula albo-sinensis seedlings in western Sichuan Province. The results showed that after a growth season, the accumulation amount of N, P and K per plant increased by 44% , 45% and 11% under Ec （P 〈 0.05） , by 37% , 76% and 9% under ET （P 〈 0. 05 ）, and by 24% , 88% and 20% under ECT（P 〈0.05） , respectively. The N allocation to leaves reduced by 11.68% （ P 〈 0.05 ） under Ec but increased by 11.09% （ P 〈0.05） under ET, while that to branches, stems and roots increased by 2. 95%, 3.39% and 5.34% under Ec （ P 〉 0. 05） , but decreased by 0. 69% , 10. 35% and 0. 05% under ET （ P 〉 0. 05）, respectively. The N allocation pattern under ECT was similar to that under Ec. The allocation of P and K had greater differences under Ec, ET and ECT. All of these suggested that elevated CO2 concentration and temperature could promote nutrient accumulation, and change its allocation pattern in plant organs.
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