A new chamber design for measuring community metabolism in a Michigan stream
A new chamber design for measuring community metabolism in a Michigan stream
复制标题
用于测量密歇根溪流中群落代谢的新室设计
作者：
D. Uzarski;T. Burton;C. A. Stricker
我们设计了一个开放式的社区代谢室来同时测量体表和体表代谢。我们的舱室设计消除了复氧，将新陈代谢隔开，维持了环境条件，并包括低肺呼吸。我们比较了从我们的低渗滤室获得的结果和从以下方面获得的结果：(1)由Bott等人推荐建造的封闭式底栖生物群落代谢室。(2)Marzolf等人修改的全流代谢技术。(1994年)。1997年7月，对密歇根三级河流奥古斯塔小溪35米的冲刷段进行了三种方法的同时比较，并在1998年7月重复了这三种方法。1997年9月，奥古斯塔小溪一段30米长的沙质河段也同时对这三种方法进行了比较，并于1998年9月重复进行。我们对群落呼吸作用(CR24)的估计与使用全流新陈代谢程序得到的结果相似，但比在四个实验中的三个使用封闭式底栖室获得的估计值高得多。这些数据表明，我们的舱室设计提供了对群落新陈代谢的估计，其中包括底栖呼吸和水下呼吸。该密闭密封室与全流密闭密封室结合了密闭密封室和全流密闭密封室的优点。这种新方法可以复制，不需要复氧系数，环境条件更接近，因为它仍然是一个开放的系统，与传统的小室方法相比，它似乎提供了更现实的全流新陈代谢估计。
We designed an open-ended community metabolism chamber to simultaneously measure surface and hyporheic metabolism. Our chamber design eliminated reaeration, compartmentalized metabolism, maintained ambient conditions and included hyporheic respiration. We compared results from our hyporheic chamber to results obtained from: (1) closed benthic community metabolism chambers constructed as recommended by Bott et al. (1978), and (2) whole-stream metabolism techniques as modified by Marzolf et al. (1994). Simultaneous comparisons of all three procedures were made for a 35 m riffle section of Augusta Creek, a 3rd-order Michigan stream, in July 1997 and repeated in July 1998. Simultaneous comparisons of all three procedures were also made for a 30 m sandy run section of Augusta Creek in September 1997, and repeated in September 1998. Our hyporheic chamber estimates for community respiration (CR24) were similar to those obtained using the whole-stream metabolism procedure but were considerably higher than estimates obtained using the closed benthic chambers in three of the four experiments. These data suggest that our chamber design provided estimates of community metabolism which included both benthic and hyporheic respiration. The chamber incorporates several positive aspects of both closed chambers and the whole-stream method. This new method can be replicated, eliminates the need for a reaeration coefficient, ambient conditions are better approximated since it remains an open system, and it appears to provide more realistic estimates of whole-stream metabolism compared to the traditional chamber approach.