Evaluating the carbon balance estimate from an automated ground-level flux chamber system in artificial grass mesocosms.
Evaluating the carbon balance estimate from an automated ground-level flux chamber system in artificial grass mesocosms.
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DOI：
10.1002/ece3.879
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发表时间：
2013-12
影响因子：
2.6
通讯作者：
Ineson, Phil
中科院分区：
文献类型：
--
作者：
Heinemeyer, Andreas;Gornall, Jemma;Baxter, Robert;Huntley, Brian;Ineson, Phil
测量和模拟陆地生态系统中碳(C)储量的变化对于解决全球碳循环模型的不确定性至关重要。在检测相对较大的C库存的短期小变化方面存在困难，需要开发出可靠、灵敏的流量测量技术。净生态系统交换(NEE)地面室越来越多地用于评估低植被生态系统中的碳动态，但迄今为止，缺乏针对测量的碳储量变化的正式、严格的实地验证。我们开发和部署了一个自动化的多路C通量小室系统，以严格比较利用每小时C通量测量获得的生态系统总C收支与破坏性净C平衡。该系统结合了透明的NEE和不透明的呼吸室，能够分隔光合作用和呼吸通量。C-BALANCE比较显示两种方法之间有很好的一致性，但仅在NEE通量因小室的存在而减少的情况下进行了校正。暗室通量可以评估不同生长阶段生态系统呼吸(RECO)组分(即异养和自养)的温度敏感性。我们认为，这种自动通量小室系统可以提供准确的C平衡，还可以对适合于模型评估和开发的不同C通量分量(例如，光合作用和呼吸作用)进行关键划分。
Measuring and modeling carbon (C) stock changes in terrestrial ecosystems are pivotal in addressing global C-cycling model uncertainties. Difficulties in detecting small short-term changes in relatively large C stocks require the development of robust sensitive flux measurement techniques. Net ecosystem exchange (NEE) ground-level chambers are increasingly used to assess C dynamics in low vegetation ecosystems but, to date, have lacked formal rigorous field validation against measured C stock changes. We developed and deployed an automated and multiplexed C-flux chamber system in grassland mesocosms in order rigorously to compare ecosystem total C budget obtained using hourly C-flux measurements versus destructive net C balance. The system combines transparent NEE and opaque respiration chambers enabling partitioning of photosynthetic and respiratory fluxes. The C-balance comparison showed good agreement between the two methods, but only after NEE fluxes were corrected for light reductions due to chamber presence. The dark chamber fluxes allowed assessing temperature sensitivity of ecosystem respiration (Reco) components (i.e., heterotrophic vs. autotrophic) at different growth stages. We propose that such automated flux chamber systems can provide an accurate C balance, also enabling pivotal partitioning of the different C-flux components (e.g., photosynthesis and respiration) suitable for model evaluation and developments.
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影响因子：
11.6
作者：
Lund, CP;Riley, WJ;Field, CB
通讯作者：
Field, CB
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