Raised atmospheric CO2 levels and increased N deposition cause shifts in plant species composition and production in Sphagnum bogs
Raised atmospheric CO2 levels and increased N deposition cause shifts in plant species composition and production in Sphagnum bogs
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DOI：
10.1046/j.1365-2486.2001.00433.x
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发表时间：
2001-05-01
影响因子：
11.6
通讯作者：
Wallén, B
中科院分区：
文献类型：
--
作者：
Berendse, F;Van Breemen, N;Wallén, B
全球二氧化碳预算中缺失的部分汇归因于二氧化碳施肥和氮沉积对北半球陆地生态系统碳固定的积极影响。泥炭藻属是温带和北部沼泽生态系统中最重要的固碳植物类群之一，因为它产生的死亡物质的降解率很低。在西欧四个地点的沼泽中，研究了增加的二氧化碳和增加的大气氮沉积对泥炭疽和其他植物生长的影响。与预期相反，二氧化碳浓度升高并没有显著影响泥炭藻生物量的增长。氮沉降的增加降低了泥炭藓的质量生长，因为它增加了维管植物和高大苔藓的盖度。植物种类组成的这种变化可能会减少以泥炭藻属为主的沼泽生态系统的碳固存。
Part of the missing sink in the global CO2 budget has been attributed to the positive effects Of CO2 fertilization and N deposition on carbon sequestration in Northern Hemisphere terrestrial ecosystems. The genus Sphagnum is one of the most important groups of plant species sequestrating carbon in temperate and northern bog ecosystems, because of the low decomposability of the dead material it produces. The effects of raised CO2 and increased atmospheric N deposition on growth of Sphagnum and other plants were studied in bogs at four sites across Western Europe. Contrary to expectations, elevated CO2 did not significantly affect Sphagnum biomass growth. Increased N deposition reduced Sphagnum mass growth, because it increased the cover of vascular plants and the tall moss Polytrichum strictum. Such changes in plant species composition may decrease carbon sequestration in Sphagnum-dominated bog ecosystems.