School of Geography, Earth and Environmental Science, Portland Square, Drake Circus, University of Plymouth, Devon PL4 8AA, United Kingdom.
School of Geography, Earth and Environmental Science, Portland Square, Drake Circus, University of Plymouth, Devon PL4 8AA, United Kingdom.
Sci Total Environ. 2019 Jun 1;667:348-358. doi: 10.1016/j.scitotenv.2019.02.239. Epub 2019 Feb 19.
This paper provides information on the impact of recent climate change on carbon sequestration in peatland systems in South West England. This is important because peatlands have the potential to sequester and hold large quantities of anthropogenically released CO This paper investigates whether there has been a reduction in the strength of carbon sinks in a valley mire and blanket bog, which occur on the limits of the biogeographical envelop for peatlands in Britain. Past rates of carbon accumulation were calculated from peat depth and the sequential analysis of peat age, bulk density and carbon content from cores taken from valley mire and blanket bog. At the valley mire site contemporary net ecosystem carbon balance (NECB) was calculated by measuring inputs to the peat body, via net primary productivity (NPP), of Sphagna. Losses of C from the peat body were calculated by measuring CH, and aquatic carbon, calculated from catchment export of particulate and dissolved organic carbon. The study found similar mean rates of carbon accumulation since 1850 of 11.26 t ± 0.68 t COe ha yr (307 g C m yr) in valley mire and 11.77 t ± 0.88 t COe ha yr (321 g C m yr) in blanket bog. The mean present-day CO sequestration rate for Sphagna on valley mire was calculated to be 9.13 t ± 0.98 t COe ha yr (249 g C m yr). Both past and contemporary rates of CO sequestration were found to be at the maxima of those reported for temperate peatlands. NPP was found to vary according to microform with higher rates of carbon sequestration found in lawn and hummock microforms compared with pools. Our work suggests that recent changes in the climate appear to have had limited impact on the strength of peatland carbon sinks in South West England.
本文提供了有关近期气候变化对英格兰西南部泥炭地系统碳固存影响的信息。这很重要，因为泥炭地具有固存和封存大量人为释放的 CO 的潜力。本文调查了在英国泥炭地生物地理范围边缘的山谷沼泽和泥炭地沼泽中，碳汇强度是否有所减弱。过去的碳积累速率是根据泥炭层的深度以及从山谷沼泽和泥炭地沼泽采集的岩芯的顺序分析得出的，包括泥炭年龄、体积密度和碳含量。在山谷沼泽地点，通过测量 Sphagna 的净初级生产力 (NPP)，计算了当代净生态系统碳平衡 (NECB)。通过测量 CH 和水生碳，从流域出口的颗粒和溶解有机碳中计算出泥炭体的 C 损失。研究发现，自 1850 年以来，山谷沼泽的碳积累平均速率相似，为 11.26 t ± 0.68 t COe ha yr（307 g C m yr），而泥炭地沼泽的碳积累平均速率为 11.77 t ± 0.88 t COe ha yr（321 g C m yr）。山谷沼泽上 Sphagna 的现代 CO 固存率平均值计算为 9.13 t ± 0.98 t COe ha yr（249 g C m yr）。过去和现代的 CO 固存率都处于温带泥炭地报告的最大值。发现 NPP 随微地形而变化，与池塘相比，草地和丘状微地形的碳固存率更高。我们的工作表明，最近气候的变化似乎对英格兰西南部泥炭地碳汇的强度影响有限。
