Fire Accelerates Assimilation and Transfer of Photosynthetic Carbon from Plants to Soil Microbes in a Northern Peatland
Fire Accelerates Assimilation and Transfer of Photosynthetic Carbon from Plants to Soil Microbes in a Northern Peatland
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DOI：
10.1007/s10021-012-9581-8
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发表时间：
2012-08
期刊：
影响因子：
3.7
通讯作者：
Susan E. Ward;N. Ostle;S. Oakley;H. Quirk;A. Stott;P. Henrys;W. Scott;R. Bardgett
中科院分区：
文献类型：
--
作者：
Susan E. Ward;N. Ostle;S. Oakley;H. Quirk;A. Stott;P. Henrys;W. Scott;R. Bardgett
北方泥炭地被认为是全球重要的陆地碳(C)储量，但我们对包括土地利用在内的全球变化如何影响这些生态系统中的碳循环过程的了解有限。利用英国一项长期(50年前)的泥炭地土地管理实验，我们采用13CO2脉冲追逐方法，研究了管理燃烧和放牧如何影响植物-土壤系统对碳的短期吸收和循环。我们发现，焚烧通过显著减少成熟的埃里克型矮生灌木的丰度，影响了植物群落的组成和生长阶段。通过减少真菌生物量，燃烧也影响了土壤微生物群落的结构，这是通过磷脂脂肪酸分析来测量的。生态系统对CO2的净交换没有差异，但与未焚烧地区相比，焚烧增加了对13CO2的光合作用吸收，增加了13C向土壤微生物群落的转移。相反，放牧对任何测量的碳循环过程都没有可检测到的影响。我们的研究提供了新的洞察力，通过增加光合作用C的吸收和地下C的转移，同时将CO2的净生态系统交换维持在燃烧前的水平，来研究管理燃烧引起的植被和土壤微生物群落的变化如何影响泥炭地的C循环过程。
Northern peatlands are recognized as globally important stores of terrestrial carbon (C), yet we have limited understanding of how global changes, including land use, affect C cycling processes in these ecosystems. Making use of a long-term (>50 year old) peatland land management experiment in the UK, we investigated, using a13CO2pulse chase approach, how managed burning and grazing influenced the short-term uptake and cycling of C through the plant–soil system. We found that burning affected the composition and growth stage of the plant community, by substantially reducing the abundance of mature ericoid dwarf-shrubs. Burning also affected the structure of the soil microbial community, measured using phospholipid fatty acid analysis, by reducing fungal biomass. There was no difference in net ecosystem exchange of CO2,but burning was associated with an increase in photosynthetic uptake of13CO2and increased transfer of13C to the soil microbial community relative to unburned areas. In contrast, grazing had no detectable effects on any measured C cycling process. Our study provides new insight into how changes in vegetation and soil microbial communities arising from managed burning affect peatland C cycling processes, by enhancing the uptake of photosynthetic C and the transfer of C belowground, whilst maintaining net ecosystem exchange of CO2at pre-burn levels.