Whole-crown 13C-pulse labelling in a sub-arctic woodland to target canopy-specific carbon fluxes
Whole-crown 13C-pulse labelling in a sub-arctic woodland to target canopy-specific carbon fluxes
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亚北极林地的全冠 13C 脉冲标记，以针对树冠特定的碳通量
DOI：
10.1007/s00468-022-02267-3
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Friggens N
中科院分区：
文献类型：
--
作者：
Friggens N
全冠13c脉冲标记可以针对林下覆盖密集地区的树冠C通量，并研究增加的光合C输入如何影响整个生态系统的C通量。在北半球高纬度地区，气候变化驱动的植物生产力增加已经被观察到。这些趋势在一定程度上是由北极生态系统中高大灌木和乔木物种的日益丰富以及树线的推进所驱动的。较高的植物生产力可能改变碳(C)分配，从而改变生态系统碳循环和土壤碳固存。了解新建立的冠层形成的上层物种对这些生态系统中碳循环的贡献是重要的。然而，由于存在密集的下层覆盖物，使得这种方法具有挑战性，既定的划分方法会引起干扰，并可能引入测量伪影。在这里，我们开发了一种原位全冠13c脉冲标记技术，以分离密集下层覆盖区域的冠层C通量。五种山桦树（桦）的树冠。利用便携式野外设备对czerepanovii)乔木进行13co2脉冲处理，并在冠标后第1-10天和第377天采集邻近非特异乔木和异特异林下灌木的叶片样本。我们在标记的树木中发现了有效和长期的叶片富集，但在非特异性或异特异性的邻近树木或木本灌木中没有证据表明13c信号。该方法具有较好的应用前景，为分离林下植被密集的生态系统中冠层树种的作用提供了一种有价值的工具。
Key messageWhole-crown13C-pulse labelling can target tree canopy C fluxes in regions with dense understorey cover and investigate how increased photosynthetic C inputs may affect whole-ecosystem C fluxes.AbstractClimate change-driven increases in plant productivity have been observed at high northern latitudes. These trends are driven, in part, by the increasing abundance of tall shrub and tree species in arctic ecosystems, and the advance of treelines. Higher plant productivity may alter carbon (C) allocation and, hence, ecosystem C cycling and soil C sequestration. It is important to understand the contributions that the newly established canopy forming overstorey species makes to C cycling in these ecosystems. However, the presence of a dense understorey cover makes this challenging, with established partitioning approaches causing disturbance and potentially introducing measurement artefacts. Here, we develop an in situ whole-crown13C-pulse labelling technique to isolate canopy C fluxes in areas of dense understorey cover. The crowns of five mountain birch (Betula pubescensssp.czerepanovii) trees were provided with a13CO2pulse using portable field equipment, and leaf samples were collected from neighbouring con-specific trees and hetero-specific understorey shrubs on days 1–10 and 377 post-crown labelling. We found effective and long-term enrichment of foliage in labelled trees, but no evidence of the13C-signal in con- or hetero-specific neighbouring trees or woody shrubs. This method is promising and provides a valuable tool to isolate the role of canopy tree species in ecosystems with dense understorey cover.
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DOI：
10.1111/j.1469-8137.2009.02883.x
发表时间：
2009-04
期刊：
The New phytologist
影响因子：
--
作者：
J. Subke;H. Vallack;T. Magnusson;S. G. Keel;D. Metcalfe;P. Högberg;P. Ineson
通讯作者：
J. Subke;H. Vallack;T. Magnusson;S. G. Keel;D. Metcalfe;P. Högberg;P. Ineson
影响因子：
9.7
作者：
Hartley, Iain P.;Hopkins, David W.;Wookey, Philip A.
通讯作者：
Wookey, Philip A.
影响因子：
30.7
作者：
Hartley, Iain P.;Garnett, Mark H.;Wookey, Philip A.
通讯作者：
Wookey, Philip A.
影响因子：
2
作者：
Powers, Elizabeth M.;Marshall, John D.
通讯作者：
Marshall, John D.
DOI：
10.1111/nph.12285
发表时间：
2013-07
期刊：
The New phytologist
影响因子：
--
作者：
L. Street;J. Subke;M. Sommerkorn;V. Sloan;Helene Ducrotoy;G. Phoenix;M. Williams
通讯作者：
L. Street;J. Subke;M. Sommerkorn;V. Sloan;Helene Ducrotoy;G. Phoenix;M. Williams