Contrasted effects of increased N and CO2 supply on two keystone species in peatland restoration and implications for global change
Contrasted effects of increased N and CO2 supply on two keystone species in peatland restoration and implications for global change
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DOI：
10.1046/j.1365-2745.2002.00679.x
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发表时间：
2002-06
影响因子：
5.5
通讯作者：
E. Mitchell;A. Buttler;P. Grosvernier;H. Rydin;A. Siegenthaler;J. Gobat
中科院分区：
文献类型：
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作者：
E. Mitchell;A. Buttler;P. Grosvernier;H. Rydin;A. Siegenthaler;J. Gobat
1温带沼泽的重要地区已被泥炭收获破坏，但可能会再生。这些次级沼泽，如果管理得当，可以作为强碳汇，调节水文和缓冲区域气候。2.然而，沼泽再生的潜在影响将取决于主要泥炭形成者泥炭藓的成功建立。水文和小气候对泥炭藓再生长的影响已经得到了很好的研究，但二氧化碳和氮沉降的影响尚不清楚。3我们在三个生长季节中在割接沼泽中进行了两次原位实验，其中我们提高了CO2（至560 p.p.m.）或N（通过添加NH4NO3，3 g m−2 year−1）。这两种处理对最初的殖民者多毛菌（有利于高N）和后来的殖民者泥炭藓fallax（有利于高CO2）之间的竞争有着截然不同的影响。4这种变化可能对沼泽再生产生重要影响，从而对采伐沼泽的碳固存产生重要影响，并可能对区域水文和气候过程产生反馈。
1 Significant areas of temperate bogs have been damaged by peat harvesting but may regenerate. These secondary mires, if well managed, may act as strong C sinks, regulate hydrology and buffer regional climate. 2 The potential effects of bog regeneration will, however, depend on the successful establishment of the principal peat formers –Sphagnum mosses. The influence of hydrology and microclimate on Sphagnum re‐growth is well studied but effects of elevated CO2 and N deposition are not known. 3 We carried out two in‐situ experiments in a cutover bog during three growing seasons in which we raised either CO2 (to 560 p.p.m.) or N (by adding NH4NO3, 3 g m−2 year−1). The two treatments had contrasting effects on competition between the initial coloniser Polytrichum strictum (favoured by high N) and the later coloniser Sphagnum fallax (favoured by high CO2). 4 Such changes may have important consequences for bog regeneration and hence for carbon sequestration in cutover bogs, with potential feedback on regional hydrological and climatic processes.