Warming effects on greenhouse gas fluxes in peatlands are modulated by vegetation composition.
Warming effects on greenhouse gas fluxes in peatlands are modulated by vegetation composition.
复制标题
DOI：
10.1111/ele.12167
复制
发表时间：
2013-10
期刊：
影响因子：
8.8
通讯作者：
Susan E. Ward;N. Ostle;S. Oakley;H. Quirk;P. Henrys;R. Bardgett
中科院分区：
文献类型：
--
作者：
Susan E. Ward;N. Ostle;S. Oakley;H. Quirk;P. Henrys;R. Bardgett
了解变暖对温室气体反馈到气候变化的影响是一项重大的全球挑战。大多数研究都集中在变暖的直接影响上，而没有考虑植物群落的同时变化如何改变这种影响。在这里，我们结合植被的操作与变暖，调查其相互作用对泥炭地温室气体排放的影响。我们发现，尽管变暖持续增加呼吸，但对生态系统CO2净交换的影响取决于植被组成。变暖后的CO2汇强度增加最多的是灌木，最大的下降时，禾本科植物。甲烷更强烈地控制植被组成比变暖，最大的排放量从禾本科植物群落。我们的研究结果表明，植物群落组成是一个重要的调制器的温室气体排放和他们对变暖的反应，并建议植被变化可能会改变泥炭地碳汇强度在未来的气候变化。
Understanding the effects of warming on greenhouse gas feedbacks to climate change represents a major global challenge. Most research has focused on direct effects of warming, without considering how concurrent changes in plant communities may alter such effects. Here, we combined vegetation manipulations with warming to investigate their interactive effects on greenhouse gas emissions from peatland. We found that although warming consistently increased respiration, the effect on net ecosystem CO2 exchange depended on vegetation composition. The greatest increase in CO2 sink strength after warming was when shrubs were present, and the greatest decrease when graminoids were present. CH4 was more strongly controlled by vegetation composition than by warming, with largest emissions from graminoid communities. Our results show that plant community composition is a significant modulator of greenhouse gas emissions and their response to warming, and suggest that vegetation change could alter peatland carbon sink strength under future climate change.