Whittaker Carly, Yates Nicola E, Powers Stephen J, Donovan Neil, Misselbrook Tom, Shield Ian
1Department of Agro-Ecology, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ UK.
2Department of Computational and Systems Biology, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ UK.
Bioenergy Res. 2017;10(2):353-362. doi: 10.1007/s12155-016-9800-9. Epub 2016 Nov 9.
This study explores the use of static chamber boxes to detect whether there are fugitive emissions of greenhouse gases (GHGs) from a willow chip storage heap. The results from the boxes were compared with those from 3-m stainless steel probes inserted into the core of the heap horizontally and vertically at intervals. The results from probes showed that there were increases of carbon dioxide (CO) concentrations in the heap over the first 10 days after heap establishment, which were correlated with a temperature rise to 60 °C. As the CO declined, there was a small peak in methane (CH) concentration in probes orientated vertically in the heap. Static chambers positioned at the apex of the heap detected some CO fluxes as seen in the probes; however, the quantities were small and random in nature. A small (maximum 5 ppm) flux in CH occurred at the same time as the probe concentrations peaked. Overall, the static chamber method was not effective in monitoring fluxes from the heap as there was evidence that gases could enter and leave around the edges of the chambers during the course of the experiment. In general, the use of standard (25 cm high) static chambers for monitoring fluxes from wood chip heaps is not recommended.
本研究探讨了使用静态箱来检测柳木屑储存堆是否存在温室气体（GHG）的逸散排放。将静态箱的结果与每隔一定间隔水平和垂直插入堆芯的3米不锈钢探头的结果进行了比较。探头的结果表明，在堆建立后的前10天内，堆中二氧化碳（CO）浓度有所增加，这与温度升至60°C相关。随着CO浓度下降，堆中垂直放置的探头中甲烷（CH）浓度出现了一个小峰值。位于堆顶的静态箱检测到了一些如探头中所见的CO通量；然而，这些通量数量少且具有随机性。在探头浓度达到峰值的同时，CH出现了一个小的（最大5 ppm）通量。总体而言，静态箱法在监测堆的通量方面并不有效，因为有证据表明在实验过程中气体可以在箱的边缘进出。一般来说，不建议使用标准的（25厘米高）静态箱来监测木屑堆的通量。
