In situ effects of elevated CO2 on the carbon and nitrogen status of alpine plants
In situ effects of elevated CO2 on the carbon and nitrogen status of alpine plants
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CO2浓度升高对高山植物碳氮状况的原位影响
DOI：
10.1046/j.1365-2435.1997.00084.x
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
C. Körner
中科院分区：
文献类型：
--
作者：
B. Schäppi;C. Körner
1.本文总结了在自然和增加养分供应（NPK）条件下，CO2浓度升高对高寒草地（瑞士中央阿尔卑斯山，2500米）组织组成的影响。
2.在3年的CO2富集的总非结构性碳水化合物（TNC）在叶片中的浓度增加了32%，在Leontodon helveticus（主要是糖）和56%，在三叶草（主要是淀粉），但没有显着变化的优势莎草苔草curvula和早熟禾高山，目前在这个网站上的稀有物种。
3.矿物质营养供应的增加（与二氧化碳浓度升高不同）极大地刺激了生长，但并没有减少二氧化碳诱导的TNC积累。
4.在CO2浓度升高的情况下，Leontodon（-21%）和Trifolium（-24%）的绿色叶的氮浓度（每克不含TNC的干物质）下降，但苔草属和早熟禾属的氮浓度没有下降或仅略有下降。氮磷钾除了补偿这种CO2对氮浓度在三叶草，但不是在其他物种的影响。
5.在地下组织中，无论是TNC还是氮浓度响应CO2施肥。
6.每单位土地面积的氮库在旺季生物量保持不受CO2处理。
7.总的来说，我们的研究结果表明，后期演替优势莎草苔草curvula保持不受CO2浓度升高，独立的矿物营养供应，而共同占主导地位的和次占主导地位的杂类草瑞士狮子草和三叶草高山表现出TNC的增加，以及在CO2浓度升高的N耗尽。
8.这些变化在活跃的植物组织转化为自然衰老的凋落物成分的变化，这表明谨慎的预测CO2对分解的影响的基础上，从绿色植物材料的数据。
1. The effect of elevated CO2 on tissue composition in an alpine grassland (Swiss Central Alps, 2500m) under both natural and increased nutrient supply (NPK) is summarized.
2. During 3 years of CO2 enrichment the concentration of total non-structural carbohydrates (TNC) in leaves increased by 32% in Leontodon helveticus (largely sugar) and by 56% in Trifolium alpinum (largely starch) but did not change significantly in the dominant sedge Carex curvula and in Poa alpina, currently a rare species at this site.
3. Enhanced mineral nutrient supply (unlike elevated CO2) greatly stimulated growth but did not reduce the CO2-induced TNC accumulation.
4. Under elevated CO2 nitrogen concentrations (per g TNC-free dry matter) of green leaves decreased in Leontodon (–21%) and in Trifolium (–24%) but not or only slightly in Carex and in Poa. NPK addition compensated this CO2 effect on nitrogen concentration in Trifolium but not in the other species.
5. In below-ground tissue neither TNC nor nitrogen concentration responded to CO2 fertilization.
6. The nitrogen pool per unit land area at peak season biomass remained unaffected by the CO2 treatment.
7. Overall our results suggest that the late successional dominant sedge Carex curvula remains unaffected by elevated CO2, independently of mineral nutrient supply, whereas the co-dominant and sub-dominant forbs Leontodon helveticus and Trifolium alpinum show both an increase of TNC as well as N depletion under elevated CO2.
8. None of these changes in active plant tissue translate into compositional changes in naturally senesced litter suggesting caution with predictions of CO2 effects on decomposition based on data from green plant material.