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中加联合野外课程博客(中国镜像站)

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[2015年8月5日] 野外采样技术训练 - Field technique practica  

2015-08-18 14:55:38|  分类: 2015 Field Cours |  标签: |举报 |字号 订阅

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本日志由红鳆鱼队的学生撰写   
Team Redbelly Dace
Group members:Zhang Xinyuan  Feng Jingyi  Zhong Manna  
Weather: Sunny, Temp:15-30℃,

This morning, we were happy to have Professor Brian for a brief lecture on the general situation of Lake Opinicon. Then, all the students were separated into two large group for two different field technique practice, and then exchanged in the afternoon. Here we will take our group as the example. 

Until this morning, we hadn’t had the chance to test the hydrology and water chemistry. Brian and his assistant, Mackenzie, introduced several common equipment for the sampling and testing. The secchi disk is used for transparency measurement. The black-and-white round plate should be loosed into the shadowed side of the water until people could no longer see it. Then we should raise the rope slowly to the point that we just began to see the disk. The length of the rope means the transparent depth of this point. The Vandorn can get water samples at certain depth. The Eckman Edge has powerful sharp scoops to grab sediment from the bottom of the water. The working principle of these two are alike: a heavy metal was used to trigger the cover underwater any time and depth you want. We divided into groups of two to three people and tried to use every tool. After that, we went a little way near the Cow Island and identify the macrophytes.

The second field technique practice was algae identification. All the students had learned this before, but it was still quite challenging. Most algae were tiny even under the microscope, so we had to search really carefully. Then, with the help of the guide book and Mingzhi, we identify the species and put them into four categories: Blue Greens, Green Algae, Diatoms and Flagellates. The morning groups had written all the species they found on the blackboard. Our task was to draw the picture for each. In three hours, we achieved a total number of twenty.

Around half past four, all the students meet at the lecture hall to enjoy the report given by Mackenzie on her latest research on algae. She focused on different factors that might affect the algal growth. The lecture hall of QUBS is the crossroad of science. All kinds of people, areas, knowledge and ideas meet here and create new sparks.
In the evening, the wetlands were destined to us and we were free to plan for our wetland assessment. Sadly, we three members of the team Redbelly Dace were separated into different groups, but that was likely to be a happy start as well. We were looking forward to the following two days to test our bodies and minds!

今天,Brian简单给我们介绍了opinicon湖的总体状况。随后,我们分为两组,分别进行湖中采样和藻类鉴别。在Brian 的带领下,我们乘船来到opinicon湖的采样点,Brian给我们介绍,并让我们使用了几种常用的采样工具和便携式水质测定仪。首先是secchi disk,这是测量湖水透明度的仪器。把黑白相间的盘放入水中,直至刚好看不见盘为止,以深度表示透明度。此方法简单易懂,但是当湖水太浅时不适用。然后是vandom,这是一种可以采集特定深度水样的仪器,将水管两侧的阀门固定在弹簧上,把水管放到指定的深度,利用重物砸到弹簧上,使弹簧松开,从而让阀门瞬间关上。接着是抓斗采样器,这是用来采集底泥和沉积物的仪器,设计上和vandom差不多,当抓斗采样器底部沉到底部时,用重物让抓斗采样器合上,从而采集沉积物。最后是便携式水质测量仪,有多种探头,可以测量水温,溶解氧,pH等指标。利用这些仪器,我们从底泥中找到了一种名为血虫的红色虫子,测定了不同深度的水温和溶解氧浓度,测定了水的透明度。

下午的学习内容是关于藻类的。明志首先简明扼要地给我们介绍一些藻类的基本知识。淡水的藻类可以分为四大类,分别是蓝藻(cyanobacteria)、绿藻(Green algae)、硅藻(Diatoms)、鞭毛藻(Flagellates)。之后,我们到船屋边上采藻类样本。明志演示如何用专门采集浮游植物的网来采集样本后,一些同学也尝试着采集浮游植物,最后一共采集了4瓶样本。然后我们回到实验室,用显微镜鉴别样本里采集到的藻类。

用显微镜观察到的第一个小生命是什么呢?就是圆滚滚的团藻(Volvox)了,它是绿藻的一种,移动得特别快。同学们像发现新大陆似的发现各种有趣的藻类,比如Gloetrichia,长得像一团黑球;长得像楼梯的颤藻oscillatoria;盘星藻pediastrum就像她的名字一样,长得美极了!在寻找藻类的过程中,我们还意外的找到了水蚤、涡虫等的浮游动物,在显微镜下,它们游得十分迅速。同学们沉浸在寻找藻类的欢乐中,最后,我们一共找到了20种藻类。 

傍晚,Mackenzie跟我们分享了她在研究生期间关于藻类研究的成果,她的研究发现营养物质以及温度对于高密度的藻类来说是至关重要的影响因素,但这两个因素对于藻类会不会大爆发的预测能力还是比较弱的。
总之,又是充实的一天。

[2015年8月5日] 野外采样技术训练 - Field technique practica - 中加联合野外课程 - 中加联合野外课程博客(中国镜像站)
 Fig.1 Dr. Brian Cumming showing the water chemistry sensor.  Brian Cumming教授正向我们展示测溶解氧的仪器

[2015年8月5日] 野外采样技术训练 - Field technique practica - 中加联合野外课程 - 中加联合野外课程博客(中国镜像站)
 Fig. 2 Our group with all the sampling equipment (water chemistry, Van Dorn, bottom grab sampler) 小组成员与采样设备(水质探测器,采水器,底泥采集器) 
[2015年8月5日] 野外采样技术训练 - Field technique practica - 中加联合野外课程 - 中加联合野外课程博客(中国镜像站)
 Fig.3 Different kinds of algae 各种藻类
[2015年8月5日] 野外采样技术训练 - Field technique practica - 中加联合野外课程 - 中加联合野外课程博客(中国镜像站)
 Fig.4 Lab work - algae ID 在实验室鉴定藻类

[2015年8月5日] 野外采样技术训练 - Field technique practica - 中加联合野外课程 - 中加联合野外课程博客(中国镜像站)
 Fig.5 all the species we have! 我们鉴别出的种类!


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