Blanket bog CO 2 flux driven by plant functional type during summer drought
Blanket bog CO 2 flux driven by plant functional type during summer drought
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夏季干旱期间植物功能类型驱动的毯式沼泽 CO 2 通量
DOI：
10.1002/eco.2503
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发表时间：
2022
期刊：
影响因子：
2.6
通讯作者：
Sterk H
中科院分区：
文献类型：
--
作者：
Sterk H
最近对联合王国的气候预测预计，全国范围内的夏季将变得更加干燥和温暖，这增加了发生更频繁和更严重干旱事件的风险。这种天气模式的变化阻碍了全球泥炭地的功能，特别是苏格兰丰富的罕见完整的毯子沼泽，占英国土壤碳的近四分之一。在这项原位研究中，来自泥炭地主要植物功能类型（PFT）的二氧化碳（CO2）通量，禾本科植物、杜鹃花科植物和其它关键覆盖物类型（即，在2018年夏季干旱之前和期间以及随后的一年中，对高地和低洼的毯子沼泽边缘和中心进行了测量和比较。在此期间，大多数站点都是大气中CO2的净来源。我们的研究结果表明，在干旱期间，净生态系统交换（NEE）受到水分可用性的限制，杜鹃花灌木表现出最高的干旱恢复能力，其次是禾本科植物（2019年GPP仍然有限）和泥炭藓。分散的NEE估计观察到整个中心和边缘地区的毯子沼泽，最高的变化在高地网站的积极侵蚀的迹象是可见的。总的来说，我们的研究表明，估计生长季节的碳通量从原位泥炭地PFT和覆盖类型可以帮助我们更好地了解全球气候变化的动态和泥炭地碳循环的轨迹的影响。
Recent climate predictions for the United Kingdom expect a nationwide shift towards drier and warmer summers, increasing the risk of more frequent and severe drought events. Such shifts in weather patterns impede functioning of global peatlands, especially rare intact blanket bogs abundant in Scotland and representing nearly a quarter of the UK's soil carbon. In this in situ study, carbon dioxide (CO2) fluxes from dominant peatland plant functional types (PFTs) such asSphagnumspp., graminoids, ericoids and other key cover types (i.e., pools and bare peat) were measured and compared across upland and low‐lying blanket bog margins and centres, immediately before and during a summer drought in 2018, and over the subsequent year. During that period, most sites acted as net sources of CO2to the atmosphere. Our results showed that net ecosystem exchange (NEE) was limited by water availability during the drought, with ericoid shrubs showing the highest drought resilience, followed by graminoids (which were still limited in GPP in 2019) andSphagnummosses. Diverging NEE estimates were observed across centre and margin areas of the blanket bogs, with highest variability across the upland site where signs of active erosion were visible. Overall, our study suggests that estimating growing season carbon fluxes from in situ peatland PFT and cover types can help us better understand global climate change impacts on the dynamics and trajectories of peatland C cycles.